A method and device for determining jaw relation

Abstract

The present application provides a method and apparatus for determining jaw relation. The method includes: obtaining a first three-dimensional facial image and a second three-dimensional facial image of a patient; determining the inclination angle of the anterior part of the plane based on the first three-dimensional facial image, and determining the labial fullness of the patient based on the second three-dimensional facial image; obtaining a third three-dimensional facial image of the patient when the inclination angle of the anterior part of the plane is within a first preset angle range and the labial fullness meets the fullness condition; determining the length of the upper face, the length of the middle face and the length of the lower face of the patient based on the third three-dimensional facial image; and determining the vertical jaw relation according to the length of the lower face when the ratio of the length of the upper face, the length of the middle face and the length of the lower face of the patient meets a preset ratio range. According to the technical solution of the present application, the jaw relation of the patient can be determined intelligently.

Description

Technical Field

[0001] This application relates to the technical field of denture fabrication, and particularly to a method and device for determining jaw relation. Background Art

[0002] Currently, during the fabrication of complete dentures, the jaw relation is usually determined using a jaw tray, such as the vertical jaw relation between the maxilla and the mandible. As Figure 1 shown, in the related art, the jaw tray 10 includes an upper jaw tray 11 and a lower jaw tray 12. The upper jaw tray 11 includes an upper baseplate 111 and an upper wax rim 112, and the lower jaw tray 12 includes a lower baseplate 121 and a lower wax rim 122. Among them, the upper wax rim 112 is arranged along the alveolar ridge 111A of the upper baseplate 111, and the lower wax rim 122 is arranged along the alveolar ridge 121A of the lower baseplate 121. Determining the vertical jaw relation using the jaw tray includes: first wearing the upper jaw tray 11 inside the patient's oral cavity, for example, wearing the upper jaw tray 11 on the patient's maxilla; then using an artificial observation method to artificially judge the two wearing effects of the inclination angle of the anterior part of the plane and the fullness of the patient's upper lip; then, when the judgment result does not meet the requirements, trimming the upper wax rim 112 based on the judgment result, and wearing the upper jaw tray 11 inside the patient's oral cavity again and making an artificial judgment until both wearing effects meet the requirements; then, wearing the lower jaw tray 12 inside the patient's oral cavity and manually measuring the vertical distance between the patient's maxilla and mandible to determine the vertical jaw relation. However, since this traditional method for determining jaw relation relies on artificial evaluation and manual measurement, it is strongly affected by subjective factors and there are measurement errors, which is not conducive to accurately recording the jaw relation. Summary of the Invention

[0003] Embodiments of this application provide a method and device for determining jaw relation to solve the problems existing in the related art.

[0004] In a first aspect, embodiments of this application provide a method for determining jaw relation, including:

[0005] Obtaining a first three-dimensional facial image and a second three-dimensional facial image of a patient; wherein, the first three-dimensional facial image is a frontal three-dimensional image collected when the patient wears an upper jaw tray and is in the rest jaw position, and the second three-dimensional facial image is a lateral three-dimensional image collected when the patient wears an upper jaw tray and is in the rest jaw position;

[0006] Determining the inclination angle of the anterior part of the plane based on the first three-dimensional facial image, and determining the lip-side fullness of the patient based on the second three-dimensional facial image;

[0007] When When the inclination angle of the front of the plane is within the first preset angle range and the fullness of the lip side meets the fullness condition, a third facial three-dimensional image of the patient is obtained; the third facial three-dimensional image is a frontal three-dimensional image acquired when the patient wears both the maxillary support and the mandibular support and is in a resting jaw position;

[0008] Based on the third facial three-dimensional image, determine the length of the upper face, the length of the middle face, and the length of the lower face of the patient;

[0009] When the ratio of the patient's upper, middle and lower tribune lengths meets the preset ratio range, the vertical jaw position relationship is determined based on the lower tribune length.

[0010] In one embodiment, based on the first facial three-dimensional image, The inclination angles of the front of the plane include:

[0011] Marking the center points of two pupils and two edge points of the maxillary support of the patient in the first facial three-dimensional image;

[0012] Determine a first connecting line between the center points of the two pupils according to the center points of the two pupils;

[0013] According to the two edge points, determining a second connecting line between the two edge points;

[0014] Calculate the angle between the first connecting line and the second connecting line;

[0015] The angle between the first and second lines is taken as The tilt angle of the front of the plane.

[0016] In one embodiment, the maxillary support includes a maxillary base and Dyke attachments, The ridge attachment is removably bonded to the alveolar ridge side of the maxillary base, and the method further comprises:

[0017] exist When the inclination angle of the front part of the plane is outside the first preset angle range, the grinding information is determined and displayed according to the inclination angle; the grinding information is used to indicate Target grinding area on the side of the dyke attachment facing away from the maxillary base;

[0018] After each grinding of the target grinding area, re-determine The inclination angle of the front part of the plane, until The inclination angle of the front portion of the plane is within a first preset angle range.

[0019] In one embodiment, determining the lip fullness of the patient based on the second facial three-dimensional image includes:

[0020] Mark the subnasale point, columella point and labial protuberance point of the patient in the second facial three-dimensional image;

[0021] Determine a third connecting line according to the subnasale point and the columella point;

[0022] Determine a fourth connecting line according to the columella point and the labial protuberance point;

[0023] Calculate the included angle between the third connecting line and the fourth connecting line to obtain the nasolabial angle of the patient;

[0024] Use the nasolabial angle of the patient as the labial fullness of the patient.

[0025] In one embodiment, the fullness condition is that the nasolabial angle is within a second preset angle range, and the method further includes:

[0026] In the case where the nasolabial angle is less than the minimum value of the second preset angle range, prompt to add wax to the labial side of the maxillary denture; and / or, in the case where the nasolabial angle is greater than the maximum value of the second preset angle range, prompt to polish the labial side of the maxillary denture;

[0027] After each adjustment of the morphology of the maxillary denture, re-determine the labial fullness of the patient until the labial fullness of the patient meets the fullness condition.

[0028] In one embodiment, based on the third facial three-dimensional image, determine the upper face length, middle face length and lower face length of the patient, including:

[0029] Mark the midpoint of the hairline, glabella point, subnasale point and mental point of the patient in the third facial three-dimensional image;

[0030] Determine the upper face length according to the position information of the midpoint of the hairline and the position information of the glabella point;

[0031] Determine the middle face length according to the position information of the glabella point and the position information of the subnasale point;

[0032] Determine the lower face length according to the position information of the subnasale point and the position information of the mental point.

[0033] In one embodiment, the method further includes:

[0034] In the case where the ratio of the upper face length, middle face length and lower face length of the patient in the third facial three-dimensional image does not meet the preset ratio range, determine the adjustment information and give a prompt;

[0035] After each adjustment of the distance between the mandibular denture and the maxillary denture, re-determine the ratio of the upper face length, middle face length and lower face length of the patient until the ratio of the upper face length, middle face length and lower face length of the patient meets the preset ratio range.

[0036] In one embodiment, the maxillary tray further includes a maxillary base and a tracing plate. The tracing plate is disposed inside the maxillary base and surrounded by the maxillary base. The mandibular tray includes a mandibular base, a bearing plate, and a tracing screw. The bearing plate is disposed inside the mandibular base and surrounded by the mandibular base. The tracing screw is rotatably disposed through the bearing plate. A method for adjusting the distance between the mandibular tray and the maxillary tray includes: adjusting the distance between the tracing plate and the bearing plate by rotating the tracing screw to adjust the distance between the mandibular tray and the maxillary tray.

[0037] In one embodiment, the maxillary base and the tracing plate of the maxillary tray are integrally formed by three-dimensional printing, and the mandibular base and the bearing plate of the mandibular tray are integrally formed by three-dimensional printing.

[0038] In a second aspect, an apparatus for determining a jaw relationship according to an embodiment of the present application includes: a processor and a memory. Instructions are stored in the memory and loaded and executed by the processor to implement the method for determining a jaw relationship in at least some of the above embodiments.

[0039] The advantages or beneficial effects in the above technical solutions at least include: obtaining a first three-dimensional facial image and a second three-dimensional facial image of a patient; wherein, the first three-dimensional facial image is a front three-dimensional image collected when the patient wears a maxillary tray and is in a rest jaw position, and the second three-dimensional facial image is a side three-dimensional image collected when the patient wears the maxillary tray and is in a rest jaw position; determining the inclination angle of the front part of the plane based on the first three-dimensional facial image, and determining the lip fullness of the patient based on the second three-dimensional facial image; when the inclination angle of the plane is within a first preset angle range and the lip fullness meets the preset fullness condition, obtaining a third three-dimensional facial image of the patient to determine the upper facial length, middle facial length, and lower facial length of the patient; the third three-dimensional facial image is a front three-dimensional image collected when the patient wears both a maxillary tray and a mandibular tray and is in a rest jaw position; when the ratio of the upper facial length, middle facial length, and lower facial length of the patient in the third three-dimensional facial image meets a preset ratio range, determining the vertical jaw relationship according to the lower facial length. In this way, by intelligently judging the inclination angle of the front part of the plane, the lip fullness, and the ratio of the upper facial length, middle facial length, and lower facial length, an accurate vertical jaw relationship is determined, avoiding errors in the jaw relationship caused by manual evaluation and manual measurement. Description of the Drawings

[0040] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the several views denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in accordance with the present application and should not be regarded as limiting the scope of the present application.

[0041] Figure 1 It is a schematic structural diagram of a jaw support in the related art.

[0042] Figure 2 It is a schematic flowchart of a method for determining a jaw relationship provided by an embodiment of the present application.

[0043] Figure 3 It is a schematic diagram of the effect of the first three-dimensional facial image.

[0044] Figure 4 It is a schematic diagram of the effect of the second three-dimensional facial image.

[0045] Figure 5 It is a schematic diagram of the effect of the third three-dimensional facial image.

[0046] Figure 6 It is A schematic diagram of the position of a plane.

[0047] Figure 7A It is a schematic top view of the upper jaw support provided by an embodiment of the present application.

[0048] Figure 7B It is a schematic front view of the upper jaw support provided by an embodiment of the present application.

[0049] Figure 7C It is a schematic diagram of the effect of the cooperation of the upper jaw support, the lower jaw support and the tracing screw.

[0050] Figure 8A It is A schematic diagram of the effect of the first side of the front part of the plane tilting downward.

[0051] Figure 8B It is A schematic diagram of the effect of the second side of the front part of the plane tilting downward.

[0052] Figure 9 It is a schematic structural diagram of a device for determining a jaw relationship provided by an embodiment of the present application. Detailed implementation manners

[0053] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0054] Figure 2 The flowchart showing the method for determining the jaw relation according to an embodiment of the present application is as follows. As Figure 2 shown, the method for determining the jaw relation may include the following steps S110 to step S150.

[0055] Step S110: Obtain the first three-dimensional facial image and the second three-dimensional facial graph of the patient. Among them, as Figure 3 shown, the first three-dimensional facial image is the front face three-dimensional image collected when the patient wears the maxillary tray and is in the rest jaw position. As Figure 4 shown, the second three-dimensional facial image is the side face three-dimensional image collected when the patient wears the maxillary tray and is in the rest jaw position.

[0056] Exemplarily, in step S110, the three-dimensional facial image may be obtained by scanning the patient's face. Optionally, the laser triangulation method may be used to scan the patient's face to obtain the three-dimensional facial image. The laser triangulation method refers to using a laser and a camera. The laser projects onto an object to form a contour, and the camera calculates the height information of the object based on the contour, thereby obtaining a three-dimensional point cloud. It may also be to obtain the three-dimensional facial image of the patient using a 3D camera. Optionally, it may be to scan a specified area of the patient's face, or it may be to scan the patient's face comprehensively. In this embodiment, the patient's face is scanned comprehensively to generate the complete face of the patient in the corresponding three-dimensional software, so that the front projection, side projection, etc. of the patient can be extracted from the three-dimensional facial image. The rest jaw position indicates a position where the mandible naturally is when a person is in a quiet rest state, that is, when not chewing, swallowing, or speaking. Specifically, after the patient wears the maxillary tray and is in the rest jaw position, the patient is scanned comprehensively to generate the complete three-dimensional facial image of the patient in the corresponding three-dimensional software. The first three-dimensional facial image is obtained by performing a front projection on the three-dimensional facial image, and the second three-dimensional facial image is obtained by performing a side projection on the three-dimensional facial image.

[0057] Step S120: Determine the inclination angle of the anterior part of the plane based on the first three-dimensional facial image, and determine the lip fullness of the patient based on the second three-dimensional facial image.

[0058] Please refer to Figure 3 and Figure 6 , Planar representation The planar OP is an imaginary plane used to determine the position and arrangement of teeth in prosthodontics and orthodontic treatments. It usually extends from the mesial contact point A1 of the maxillary central incisor to the mesial buccal cusp tip A2 of the bilateral first molars. The anterior part OP1 of the plane is the area on the side of the plane OP adjacent to the mesial contact point A1.

[0059] The labial fullness refers to the fullness of the soft tissues (gingiva and surrounding tissues) on the labial side of the teeth (i.e., the side facing the lips). The labial fullness can be a specifically calculated value or an evaluated grade.

[0060] Step S130, when the inclination angle of the anterior part of the plane is within the first preset angle range and the labial fullness meets the preset fullness condition, obtain the third facial three-dimensional image of the patient; as Figure 5 shown, the third facial three-dimensional image is the frontal three-dimensional image collected when the patient is wearing both the maxillary tray and the mandibular tray and is in the rest jaw position.

[0061] Exemplarily, the first preset angle range can be -2° to +2° (including the endpoint values). It should be noted that the first preset angle range can be selected and adjusted according to actual needs, and the embodiments of the present application do not limit this.

[0062] The preset fullness condition can be set according to actual needs. For example, the preset fullness condition can be that there is an increase in the grade of the labial fullness, or the grade of the labial fullness meets the preset grade, or the labial fullness meets the preset fullness range (such as the nasolabial angle range).

[0063] Specifically, whether the inclination angle of the anterior part of the plane is within the first preset angle range, and the comparison between the labial fullness and the preset fullness condition can be carried out synchronously or sequentially. Among them, the sequential execution can be: first determine whether the inclination angle of the plane is within the first preset angle range; if so, then compare the labial fullness with the preset fullness condition. If the labial fullness meets the preset fullness condition, after the patient wears both the maxillary tray and the mandibular tray and is in the rest jaw position, perform a facial scan on the patient to obtain the third facial three-dimensional image.

[0064] Step S140, based on the third facial three-dimensional image, determine the length of the upper face, the length of the middle face, and the length of the lower face of the patient.

[0065] Step S150: When the ratios of the upper facial length, middle facial length, and lower facial length of the patient in the third facial three-dimensional image satisfy a preset ratio range, determine the vertical jaw relation according to the lower facial length.

[0066] In step S150, exemplarily, the preset ratio range is set according to the actual situation. For example, the standards for the upper facial length, middle facial length, and lower facial length are trisected, based on "the distances of the upper, middle, and lower thirds of the face are approximately equal", that is, 1:1:1. Therefore, the preset ratio range is set by floating up and down according to 1:1:1. If the ratio is within the preset ratio range, the vertical jaw relation is the lower facial length.

[0067] In the technical solution of the present application, obtain the first facial three-dimensional image and the second facial three-dimensional image of the patient; wherein, the first facial three-dimensional image is the frontal three-dimensional image collected when the patient wears an upper dental tray and is in the rest jaw position, and the second facial three-dimensional image is the lateral three-dimensional image collected when the patient wears an upper dental tray and is in the rest jaw position; determine the inclination angle of the anterior part of the plane based on the first facial three-dimensional image, and determine the lip fullness of the patient based on the second facial three-dimensional image; in the case where the inclination angle of the anterior part of the plane is within the first preset angle range and the lip fullness meets the preset fullness condition, obtain the third facial three-dimensional image of the patient to determine the upper facial length, middle facial length, and lower facial length of the patient; the third facial three-dimensional image is the frontal three-dimensional image collected when the patient wears both an upper dental tray and a lower dental tray and is in the rest jaw position; when the ratios of the upper facial length, middle facial length, and lower facial length of the patient in the third facial three-dimensional image satisfy the preset ratio range, determine the vertical jaw relation according to the lower facial length. Thus, by intelligently judging the inclination angle of the anterior part of the plane, the lip fullness, and the ratios of the upper facial length, middle facial length, and lower facial length, the accurate vertical jaw relation is determined, avoiding the errors caused by manual evaluation and manual measurement to the jaw relation.

[0068] In one implementation manner, please refer to Figure 3 together, determining the inclination angle of the plane based on the first facial three-dimensional image includes the following steps S210 to S250.

[0069] Step S210: Mark the center points A and B of the two pupils of the patient and the two edge points C and D of the upper dental tray in the first facial three-dimensional image.

[0070] Exemplarily, marking the center points A and B of the patient's two pupils and the two edge points C and D of the maxillary tray in the first facial three-dimensional image can be as follows: using open-source software (such as meshlab) to display the first facial three-dimensional image, in response to the user's marking operation (i.e., the user clicks in the software interface), mark the center points A and B of the patient's two pupils and any two edge points C and D of the maxillary tray, and obtain the position information of the center points A and B of the patient's two pupils and the position information of the two edge points C and D of the maxillary tray in the first facial three-dimensional image. Among them, the position information can be the three-dimensional coordinates of the corresponding points. The edge points can be the lower edge points of the maxillary tray.

[0071] Step S220: Determine the first connection line L1 between the center points A and B of the two pupils.

[0072] Exemplarily, step S220 can be: in response to the user marking the center points A and B of the patient's two pupils in the first facial three-dimensional image, automatically connect the center points A and B of the two pupils to obtain the first connection line L1.

[0073] Step S230: Determine the second connection line L2 between the two edge points C and D.

[0074] Exemplarily, as Figure 3 shown, step S123 can be: in response to the user marking any two edge points C and D of the maxillary tray in the first facial three-dimensional image, automatically connect the two edge points C and D to obtain the second connection line L2. Among them, the second connection line L2 is located on the anterior plane, so the second connection line L2 can be used to characterize the anterior plane OP1.

[0075] Step S240: Calculate the included angle between the first connection line L1 and the second connection line L2.

[0076] Among them, please refer to Figure 3 , step S240 can be: according to the three-dimensional coordinates corresponding to the center points A and B of the two pupils, determine the function corresponding to the first connection line L1; according to the three-dimensional coordinates corresponding to the two edge points C and D, determine the function corresponding to the second connection line L2; calculate the angle between the function corresponding to the first connection line L1 and the function corresponding to the second connection line L2.

[0077] Step S240 may also be: taking the center points A and B of the two pupils as the two endpoints of the first connection line L1, taking any two edge points C and D obtained from the lower edge of the maxillary tray as the two endpoints of the second connection line L2, and respectively determining the direction vector corresponding to the first connection line L1 according to the three-dimensional coordinates of the two endpoints of the first connection line L1, and determining the direction vector corresponding to the second connection line L2 according to the three-dimensional coordinates of the two endpoints of the second connection line L2; calculating the dot product and the modulus length according to the direction vector corresponding to the first connection line L1 and the direction vector corresponding to the second connection line L2, and finally calculating the included angle between the first connection line L1 and the second connection line L2 by using the dot product and the modulus length.

[0078] Step S250: taking the included angle between the first connection line L1 and the second connection line L2 as the inclination angle of the anterior plane OP1.

[0079] In practical applications, when the patient wears a maxillary tray and a mandibular tray and is in the rest jaw position, usually through manual observation to determine whether the first connection line L1 between the center points A and B of the patient's two pupils is substantially parallel to the anterior plane OP1, it is easy to generate artificial observation and measurement errors.

[0080] In the above solution, by first marking the center points A and B of the patient's two pupils and the two edge points C and D of the maxillary tray on the first three-dimensional facial image, and automatically connecting the center points A and B of the two pupils into the first connection line L1, and connecting the two edge points C and D into the second connection line L2, the observation and measurement errors generated when determining the first connection line L1 and the second connection line L2 in the manual observation method can be reduced; then using the three-dimensional coordinates corresponding to the center points A and B of the two pupils and the three-dimensional coordinates corresponding to the two edge points C and D to calculate the included angle between the first connection line L1 and the second connection line L2 and taking it as the inclination angle of the anterior plane, the inclination angle of the anterior plane can be determined more accurately, further reducing the artificial observation and measurement errors and being beneficial to improving the efficiency of the restoration process.

[0081] In one embodiment, as Figure 3 、 Figure 7A and Figure 7B shown, the maxillary tray 11 includes a maxillary base 111 and a wax rim attachment 113, the wax rim attachment 113 is detachably bonded to the alveolar ridge side of the maxillary base 111, and the method further includes:

[0082] In the case where the inclination angle of the anterior plane OP1 is outside the first preset angle range, determining and prompting according to the inclination angle of the anterior plane OP1 The target grinding area on the side of the ridge attachment 113 away from the maxillary base 111;

[0083] After each grinding of the target area of the ridge attachment 113, re-determine the tilt angle of the anterior plane OP1 until the tilt angle of the anterior plane OP1 is within the first preset angle range.

[0084] Exemplarily, the value of the tilt angle of the anterior plane OP1 is a value with a plus or minus sign, such as Figure 3 and Figure 8A shown, the plus sign indicates the first side of the anterior plane OP1 slopes downward, as Figure 3 and Figure 8B shown, the minus sign indicates the second side of the anterior plane OP1 slopes downward, and the first side and the second side are the two opposite sides in the direction of the anterior plane OP1. According to the tilt angle of the anterior plane OP1, determine and prompt the target grinding area of the ridge attachment 113 can be:

[0085] According to the mathematical sign of the value of the tilt angle of the anterior plane OP1, determine the tilted side of the anterior plane OP1;

[0086] Determine the area of the ridge attachment 113 located on the tilted side of the anterior plane OP1 as the target grinding area and prompt.

[0087] Taking the first side of the anterior plane OP1 as the left side and the second side as the right side as an example, as Figure 7B and Figure 8A shown, when the left side of the anterior plane OP1 slopes downward, then determine and prompt the area of the ridge attachment 113 located on the left side 113A of the anterior plane OP1 as the target grinding area; as Figure 7B and 8B shown, when the right side of the anterior plane OP1 slopes downward, then determine and prompt the area of the ridge attachment 113 located on the right side of the anterior plane OP1 as the target grinding area. In this way, the target grinding area of the ridge attachment 113 can be determined quickly and accurately, which helps to improve the efficiency of adjusting the maxillary tray 11.

[0088] Among them, re - determining the inclination angle of the front part of the plane includes: during each grinding after the occlusal rim attachment 113 deviates from the side of the maxillary base 111, let the patient wear the ground maxillary tray 11 again, then scan the patient's face to obtain the adjusted first facial three - dimensional image. Recalculate the inclination angle of the front part of the plane OP1 of the adjusted first facial three - dimensional image until the inclination angle of the front part of the plane OP1 is within the first preset angle range.

[0089] In the above - mentioned solution, when the inclination angle of the front part of the plane OP1 is outside the first preset angle range, by determining and prompting according to the inclination angle of the front part of the plane OP1 the target grinding area on the side where the occlusal rim attachment 113 deviates from the maxillary base 111 is beneficial to prompting the user to accurately grind the occlusal rim attachment 113, and after each grinding of the side where the occlusal rim attachment 113 deviates from the maxillary base 111, re - determine the inclination angle of the front part of the plane OP1 until the inclination angle of the front part of the plane OP1 is within the first preset angle range, which can quickly and accurately adjust the morphology of the maxillary tray 11 and quickly feedback the change of the inclination angle of the front part of the plane OP1 during the adjustment process, so that the maxillary tray 11 quickly meets the restoration requirements and can effectively improve the efficiency of the restoration process. In one implementation manner, please also refer to

[0090] and determining the lip fullness of the patient based on the second facial three - dimensional image includes the following steps S310 to S350. Figure 4 Steps S310, mark the subnasale point E, columella nasi point F and labial protuberance point G of the patient in the second facial three - dimensional image.

[0091] Among them, the acquisition method of the second facial three - dimensional image includes: after facial scanning, use open - source software (such as meshlab) to display to obtain the patient's facial three - dimensional image, and perform a lateral projection on the facial three - dimensional image to obtain the second facial three - dimensional image.

[0092] Exemplarily, step S310 may be: in response to the user's marking operation (i.e., the user clicks on the software interface), mark the subnasale point E, columella nasi point F and labial protuberance point G of the patient in the second facial three - dimensional image, and extract the three - dimensional coordinates of the subnasale point E, columella nasi point F and labial protuberance point G.

[0093] Exemplarily, step S310 may be: in response to the user's marking operation (i.e., the user clicks on the software interface), mark the subnasale point E, columella nasi point F and labial protuberance point G of the patient in the second facial three - dimensional image, and extract the three - dimensional coordinates of the subnasale point E, columella nasi point F and labial protuberance point G.

[0094] Step S320: Determine the third connection line L3 based on the subnasale point E and the columella point F.

[0095] Among them, step S320 may be: in response to the user's operation of marking the subnasale point E and the columella point F of the patient, automatically connect the subnasale point E and the columella point F into the third connection line L3.

[0096] Step S330: Determine the fourth connection line L4 based on the columella point F and the labial protuberance point G.

[0097] Among them, step S330 may be: in response to the user's operation of marking the columella point F and the labial protuberance point G of the patient, automatically connect the columella point F and the labial protuberance point G into the fourth connection line L4.

[0098] Step S340: Calculate the included angle between the third connection line L3 and the fourth connection line L4 to obtain the nasolabial angle β of the patient.

[0099] Among them, step S340 may be: use the three-dimensional coordinates of the subnasale point E and the columella point F as the two endpoints of the third connection line L3, use the three-dimensional coordinates of the columella point F and the labial protuberance point G as the two endpoints of the fourth connection line L4, calculate the direction vectors corresponding to the third connection line L3 and the fourth connection line L4 respectively, calculate the dot product and modulus length according to the direction vectors corresponding to the third connection line L3 and the fourth connection line L4, and finally calculate the angle β between the third connection line L3 and the fourth connection line L4 using the dot product and modulus length, that is, the nasolabial angle β.

[0100] Step S350: Take the nasolabial angle β of the patient as the labial fullness of the patient. Among them, the labial fullness can be represented by the nasolabial angle β, and the nasolabial angle β refers to the included angle between the columella (lower edge of the nasal tip) and the upper lip.

[0101] In the above solution, by first marking the subnasale point E, the columella point F, and the labial protuberance point G of the patient on the second facial three-dimensional image, automatically connecting the subnasale point E and the columella point F into the third connection line L3, connecting the columella point F and the labial protuberance point G into the fourth connection line L4, and then calculating the included angle β between the third connection line L3 and the fourth connection line L4 using the three-dimensional coordinates corresponding to the subnasale point E, the columella point F, and the labial protuberance point G and quantifying it as the labial fullness of the patient, the labial fullness of the patient can be determined quickly and accurately, realizing the intelligent measurement and accurate evaluation of the labial fullness of the patient, reducing the artificial observation and determination error, and being beneficial to improving the efficiency of the repair process.

[0102] In one implementation, please refer to Figure 4 、 Figure 7A and Figure 7B, the plumpness condition is that the nasolabial angle β is within the second preset angle range. The method further includes: in the case where the nasolabial angle β is less than the minimum value of the second preset angle range, prompting to add wax to the labial side of the maxillary denture base 11; and / or, in the case where the nasolabial angle β is greater than the maximum value of the second preset angle range, prompting to grind the labial side of the maxillary denture base 11; after each adjustment of the morphology of the maxillary denture base 11, re-determine the labial plumpness of the patient until the labial plumpness of the patient meets the plumpness condition.

[0103] Exemplarily, the second preset angle range can be 95.66° ± 11.25° (including the endpoint values). The second preset angle range can be set according to the literature in the prior art. The second preset angle range can also be set in combination with the nasolabial angle of the current patient when not wearing the maxillary denture base. For example, there are literature studies on the nasolabial angle ranges of different age, race, and gender populations. Taking middle-aged and elderly women as an example, the literature points out that the nasolabial angle range of middle-aged and elderly Asian women without anterior tooth loss is 95.66° ± 11.25°, so the second preset angle range can be set to 95.66° ± 11.25°.

[0104] Judge whether the nasolabial angle β is between 95.66° ± 11.25°. If so, the nasolabial angle β meets the preset plumpness condition; if not, prompt to adjust the maxillary denture base 11. For example, when the nasolabial β angle is less than 84.41°, prompt to add wax to the labial side of the maxillary denture base 11 to adjust the morphology of the maxillary denture base 11; when the nasolabial β angle is greater than 106.91°, prompt to grind the labial side of the maxillary denture base 11 to adjust the morphology of the maxillary denture base 11; after each adjustment of the morphology of the maxillary denture base 11, the patient wears the ground maxillary denture base 11 again, and then scan the patient's face to obtain the adjusted second facial three-dimensional image. Recalculate the nasolabial angle β of the adjusted second facial three-dimensional image until the nasolabial angle β meets the preset plumpness condition.

[0105] In this embodiment, the adjustment of the maxillary tray 11 includes: when the nasolabial angle β is smaller than the minimum value of the second preset angle range, the upper lip fullness is too small. By prompting to add wax material to the labial side of the maxillary tray 11, it can assist in adjusting the morphology of the maxillary tray 11, which is beneficial to reminding the user to increase the labial side support by adding wax material; when the nasolabial angle β is larger than the maximum value of the second preset angle range, the upper lip fullness is too large. By prompting to polish the labial side of the maxillary tray 11, it can also assist in adjusting the morphology of the maxillary tray 11, which is beneficial to reminding the user to use sandpaper to polish the labial side of the maxillary tray 11 to reduce the labial side support. Thus, compared with the current method of comparing the facial shape restored after the patient wears the maxillary tray with the lateral photo before tooth loss, in this application, the nasolabial angle β is automatically measured, and the second preset angle range of the preset nasolabial angle β is used as a guide to assist in determining the labial fullness in a quantifiable and repeatable manner.

[0106] It should be noted that it can be measured separately after each adjustment of the maxillary tray 11 the inclination angle of the anterior part of the plane OP1 and the nasolabial angle β, and then the maxillary tray 11 is adjusted uniformly. It can also be that only when the inclination angle of the anterior part of the plane OP1 is within the first preset angle range, the nasolabial angle β is measured, and the maxillary tray 11 is adjusted according to the nasolabial angle β.

[0107] In one implementation manner, please refer to Figure 5 together, and this method further includes the following steps S410 to S440.

[0108] Step S410: Mark the hairline midpoint H, glabella point I, subnasal point J, and mental point K of the patient in the third facial three-dimensional image.

[0109] Exemplarily, step S410 can be: using open-source software (such as meshlab) to display and obtain the third facial three-dimensional image. In response to the user's marking operation (that is, the user clicks on the software interface), determine the hairline midpoint H, glabella point I, subnasal point J, and mental point K of the patient in the third facial three-dimensional image, and extract the position information corresponding to the above four points. Among them, the position information can be the three-dimensional coordinates of the corresponding points.

[0110] Step S420: Determine the upper facial height H1 according to the position information of the hairline midpoint H and the glabella point I.

[0111] Among them, step S420 can be: calculate the distance between the hairline midpoint H and the glabella point I according to the three-dimensional coordinates of the hairline midpoint H and the glabella point I; use this distance as the upper facial height H1.

[0112] Step S430: Determine the length of the middle face according to the position information of the glabella point and the subnasale point.

[0113] Among them, step S430 may be: Calculate the distance between the glabella point I and the subnasale point J according to the three-dimensional coordinates of the glabella point I and the subnasale point J; Take this distance as the length of the middle face H2.

[0114] Step S440: Determine the length of the lower face H3 according to the position information of the subnasale point J and the menton point K.

[0115] Among them, step S440 may be: Calculate the distance between the subnasale point J and the menton point K according to the three-dimensional coordinates of the subnasale point J and the menton point K; Take this distance as the length of the lower face H3.

[0116] In this way, after marking the midpoint of the hairline H, glabella point I, subnasale point J, and menton point K of the patient on the third facial three-dimensional image, the upper face length H1, middle face length H2, and lower face length H3 of the patient can be automatically calculated, which is beneficial to quickly evaluate the effect when the patient wears the maxillary tray 11 and the mandibular tray 12.

[0117] In one implementation, please refer to Figure 5 and Figure 7C , the method further includes:

[0118] In the case where the ratio of the upper face length H1, middle face length H2, and lower face length H3 of the patient in the third facial three-dimensional image does not satisfy the preset ratio range, adjust the distance between the mandibular tray 11 and the maxillary tray 12 and re-determine the ratio of the upper face length H1, middle face length H2, and lower face length H3 of the patient until the ratio of the upper face length H1, middle face length H2, and lower face length H3 of the patient satisfies the preset ratio range.

[0119] Exemplarily, in the case where the ratio of the upper face length H1, middle face length H2, and lower face length H3 of the patient in the third facial three-dimensional image does not satisfy the preset ratio range, adjusting the distance between the mandibular tray 11 and the maxillary tray 12 may include:

[0120] Determine the relationship between the lower face length H1 and the average value of the sum of the upper face length H2 and the middle face length H3;

[0121] If the lower face length H3 is less than this average value, increase the distance between the mandibular tray 11 and the maxillary tray 12;

[0122] If the lower face length H3 is greater than this average value, decrease the distance between the mandibular tray 11 and the maxillary tray 12.

[0123] Exemplarily, the ratio of re-determining the upper face length H1, the middle face length H2, and the lower face length H3 of the patient can be: the patient wears the adjusted upper dental tray 11 and the lower dental tray 12 again, and then scans the patient's face to obtain the adjusted third three-dimensional facial image; re-calculate the ratio of the upper face length H1, the middle face length H2, and the lower face length H3 of the adjusted third three-dimensional facial image, and repeat this process until the ratio of the upper face length H1, the middle face length H2, and the lower face length H3 meets the preset ratio range, and record the lower face length H3 as the vertical jaw relationship.

[0124] In this way, compared with the related art that manually measures the distance with a vertical distance ruler (similar to a vernier caliper), the present application guides the distance between the lower dental tray 11 and the upper dental tray 12 according to the ratio of the upper face length H1, the middle face length H2, and the lower face length H3, thereby improving the determination efficiency of the vertical jaw relationship and increasing the accuracy of the determination of the vertical jaw relationship.

[0125] In one embodiment, please also refer to Figures 7A to 7C , the upper dental tray 11 further includes a tracing plate 114, the tracing plate 114 is arranged on the inner side of the upper dental base 111 and is surrounded by the upper dental base 111, the lower dental tray 12 includes a lower dental base 121, a bearing plate 123, and a tracing screw 124, the bearing plate 123 is arranged on the inner side of the lower dental base 121 and is surrounded by the lower dental base 121, the tracing screw 124 is rotatably penetrated through the bearing plate 123, and the method for adjusting the distance between the lower dental tray 11 and the upper dental tray 12 includes: adjusting the distance between the tracing plate 114 and the bearing plate 123 by rotating the tracing screw 124 to realize the adjustment of the distance between the lower dental tray 11 and the upper dental tray 12.

[0126] Specifically, a configuration hole (not marked in the drawing) for the tracing screw 124 to rotate up and down is opened on the tracing plate 114. By rotating the tracing screw 124, the distance between the tracing plate 114 and the bearing plate 123 can be increased, correspondingly realizing the increase or shortening of the distance between the lower dental tray 12 and the upper dental tray 11. In this embodiment, when adjusting the tracing screw 124 in the lower dental tray 12, for example, when the length of the exposed screw in the area B1 circled by the tracing screw 124 increases, the distance between the lower dental tray 12 and the upper dental tray 11 increases; when the length of the exposed screw decreases, the distance between the lower dental tray 12 and the upper dental tray 11 decreases and they approach each other. In this way, by rotating the tracing screw 124 to adjust the length of its exposure, the distance between the lower dental tray 12 and the upper dental tray 11 can be adjusted more conveniently to improve the determination efficiency of the vertical jaw relationship.

[0127] In one embodiment, please also refer to Figures 7A to 7C, the maxillary base 111 of the maxillary tray 11 and the tracing plate 114 are integrally formed by three-dimensional printing, and the mandibular base 121 of the mandibular tray 12 and the bearing plate 124 are integrally formed by three-dimensional printing. In addition, the tracing screw 124 and the occlusal rim attachment 113 can also be formed by three-dimensional printing. Among them, when the occlusal rim attachment 113 is bonded to the alveolar ridge side of the maxillary base 111, the maxillary tray 11 is formed.

[0128] In one embodiment, please refer to Figures 7A to 7C . The jaw relation also includes the centric relation position, and the method for determining the jaw relation further includes: when the patient wears the maxillary tray 11 and the mandibular tray 12, performing Gothic arch tracing to draw a Gothic arch shape by using the ink coated on the tracing plate 114; taking the vertex of the Gothic arch shape as the centric relation position point; and determining the horizontal position relation between the patient's maxilla and mandible according to the centric relation position point. Based on this, it is convenient to record the patient's horizontal position relation by using the maxillary tray 11 and the mandibular tray 12, providing an important basis and reference for guiding subsequent artificial tooth arrangement.

[0129] Another embodiment of the present application also proposes a device for determining the jaw relation. Referring to Figure 9 shown, the device includes: a memory 800 and a processor 810; wherein, the memory 800 is connected to the processor 810 and is used for storing programs; the processor 810 is used for implementing the method for determining the jaw relation in any of the above embodiments by running the programs stored in the memory 800.

[0130] Specifically, the above electronic device may further include: a bus, a communication interface 820, an input device 830, and an output device 840.

[0131] The processor 810, the memory 800, the communication interface 820, the input device 830, and the output device 840 are interconnected through the bus. Among them:

[0132] The bus may include a path for transmitting information between various components of the computer system.

[0133] The processor 810 may be a general-purpose processor, such as a general-purpose central processing unit (CPU), a microprocessor, etc., or an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present invention. It may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0134] The processor 810 may include a main processor, and may also include a baseband chip, a modem, etc.

[0135] The memory 800 stores a program for implementing the technical solution of the present invention, and may also store an operating system and other critical services. Specifically, the program may include program code, and the program code includes computer operation instructions. More specifically, the memory 800 may include a read-only memory (ROM), other types of static storage devices that can store static information and instructions, a random access memory (RAM), other types of dynamic storage devices that can store information and instructions, a disk memory, a flash memory, and so on.

[0136] The input device 830 may include a device for receiving data and information input by a user, such as a keyboard, a mouse, a camera, a scanner, a light pen, a voice input device, a touch screen, a pedometer, or a gravity sensor, etc.

[0137] The output device 840 may include a device for allowing information to be output to a user, such as a display screen, a printer, a speaker, etc.

[0138] The communication interface 820 may include a device of any transceiver type for communicating with other devices or communication networks, such as an Ethernet, a radio access network (RAN), a wireless local area network (WLAN), etc.

[0139] The processor 810 executes the program stored in the memory 800 and calls other devices, and can be used to implement each step of any one of the voice recognition methods provided in the above embodiments of the present application.

[0140] It should be understood that the above-mentioned processor may be a central processing unit (CPU), and may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. It is worth noting that the processor may be a processor supporting the advanced RISC machines (ARM) architecture.

[0141] Further, optionally, the above-mentioned memory may include a read-only memory and a random access memory, and may further include a non-volatile random access memory. The memory may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may include a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may include a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available. For example, static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus random access memory (DR RAM).

[0142] In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions according to the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.

[0143] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0144] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0145] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of various changes or substitutions, and these should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for determining jaw position relationship, characterized in that: include: Acquire a first three-dimensional facial image and a second three-dimensional facial image of the patient; wherein the first three-dimensional facial image is a frontal three-dimensional image acquired when the patient is wearing a maxillary support and is in a resting jaw position, and the second three-dimensional facial image is a side three-dimensional image acquired when the patient is wearing the maxillary support and is in a resting jaw position; Determining based on the first facial three-dimensional image an inclination angle of the front of the plane, and determining the lip fullness of the patient based on the second facial three-dimensional image; In the When the inclination angle of the front part of the plane is within the first preset angle range and the lip fullness meets the fullness condition, a third facial three-dimensional image of the patient is acquired; the third facial three-dimensional image is a frontal three-dimensional image acquired when the patient wears the maxillary support and the mandibular support at the same time and is in a resting jaw position; Determine the length of the upper face, the length of the middle face, and the length of the lower face of the patient based on the third facial three-dimensional image; When the ratio of the patient's upper face length, middle face length and lower face length meets a preset ratio range, the vertical jaw position relationship is determined according to the lower face length.

2. The method according to claim 1, characterized in that determining based on the first facial three-dimensional image The inclination angles of the front of the plane include: Marking the center points of the two pupils of the patient and the two edge points of the maxillary support in the first facial three-dimensional image; Determining a first connecting line between the center points of the two pupils according to the center points of the two pupils; Determine a second connecting line between the two edge points according to the two edge points; Calculating the angle between the first connecting line and the second connecting line; The angle between the first connecting line and the second connecting line is taken as The tilt angle of the front of the plane.

3. The method according to claim 1, characterized in that The maxillary support comprises a maxillary base and Dyke attachment, The ridge attachment is detachably bonded to the alveolar ridge side of the maxillary base, and the method further comprises: In the When the inclination angle of the front portion of the plane is outside the first preset angle range, grinding information is determined and displayed according to the inclination angle; the grinding information is used to indicate a target grinding area of ​​the side of the dyke attachment facing away from the maxillary base; After each grinding of the target grinding area, the The inclination angle of the front part of the plane is The inclination angle of the front portion of the plane is within the first preset angle range.

4. The method according to claim 1, characterized in that: Determining the lip fullness of the patient based on the second facial three-dimensional image includes: marking the subnasal point, columella point and upper lip prominence point of the patient in the second facial three-dimensional image; Determine a third connecting line according to the subnasal point and the columella point; Determine a fourth connecting line according to the columella point and the upper lip protrusion point; Calculating the angle between the third connecting line and the fourth connecting line to obtain the nasolabial angle of the patient; The patient's nasolabial angle was taken as the patient's lip fullness.

5. The method according to claim 4, characterized in that The fullness condition is that the nasolabial angle is within a second preset angle range, and the method further includes: When the nasolabial angle is less than the minimum value of the second preset angle interval, a prompt is given to add wax to the labial side of the maxillary support; and / or, when the nasolabial angle is greater than the maximum value of the second preset angle interval, a prompt is given to polish the labial side of the maxillary support; After each adjustment of the shape of the maxillary support, the lip fullness of the patient is re-determined until the lip fullness of the patient meets the fullness condition.

6. The method according to claim 1, characterized in that Determining the length of the upper face, the length of the middle face, and the length of the lower face of the patient based on the third facial three-dimensional image includes: marking the midpoint of the hairline, the point between the eyebrows, the subnasal point and the subchin point of the patient in the third facial three-dimensional image; Determine the length of the upper face according to the position information of the midpoint of the hairline and the position information of the point between the eyebrows; Determine the length of the atrium according to the position information of the glabella point and the position information of the subnasal point; The length of the lower jaw is determined according to the position information of the subnasal point and the position information of the subchin point.

7. The method according to claim 1, characterized in that The method further comprises: When the ratio of the length of the upper face, the length of the middle face, and the length of the lower face of the patient in the third three-dimensional facial image does not satisfy a preset ratio range, determining adjustment information and providing a prompt; After each adjustment of the distance between the mandibular support and the maxillary support, the ratio of the length of the upper face, the length of the middle face and the length of the lower face of the patient is re-determined until the ratio of the length of the upper face, the length of the middle face and the length of the lower face of the patient meets a preset ratio range.

8. The method according to claim 7, characterized in that The maxillary support includes a maxillary base and a tracing plate, wherein the tracing plate is arranged on the inner side of the maxillary base and is surrounded by the maxillary base; the mandibular support includes a mandibular base, a supporting plate and a tracing screw, wherein the supporting plate is arranged on the inner side of the mandibular base and is surrounded by the mandibular base; the tracing screw is rotatably passed through the supporting plate; the method for adjusting the distance between the mandibular support and the maxillary support includes: adjusting the distance between the tracing plate and the supporting plate by rotating the tracing screw, thereby adjusting the distance between the mandibular support and the maxillary support.

9. The method according to claim 8, characterized in that in, The maxillary base and the tracing plate of the maxillary support are integrally formed by three-dimensional printing, and the mandibular base and the bearing plate of the mandibular support are integrally formed by three-dimensional printing.

10. A device for determining jaw position relationship, characterized in that: include: A processor and a memory, wherein the memory stores instructions, and the instructions are loaded and executed by the processor to implement the method for determining the jaw relationship as described in any one of claims 1 to 7.

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