Face bow and application thereof

Abstract

The present invention discloses a new type of face bow and its application. The new type of face bow includes a face mask frame, which is in a cross shape. The face mask frame is provided with a connector for connecting a fork or a support. A groove for accommodating a radiation-blocking gutta-percha is provided on the outer surface of the face mask frame and along the cross shape. The multifunctional digital face bow provided by the present invention is conducive to accurately and quickly obtaining three-dimensional information of the patient's face and dentition, constructing a virtual patient, and fully displaying the relationship between the patient's teeth, gums, and lips; at the same time, it completes the transfer of virtual jaw relationship, which plays an important role in guiding the production of restorations and doctor-patient communication. The face bow provided by the present invention is easy to use and lightweight, reducing the patient's discomfort; at the same time, the digital data obtained by fitting can be imported into the restoration design software, and the restoration can be produced by CAD / CAM, so that the finished product is consistent with the design.

Description

Technical Field

[0001] The present invention relates to the technical field of oral restoration and implantation, and in particular to a novel face bow and application thereof. Background Art

[0002] In the clinical process of oral restoration and implantation, in order to make the restoration more accurate and effective, it is often necessary to transfer the positional relationship between the patient's maxillary and mandibular dentition and the temporomandibular joint to the jaw frame, simulate the patient's intraoral conditions, and guide the design and production of the restoration.

[0003] Jaw frames can be divided into simple jaw frames, semi-adjustable jaw frames and fully adjustable jaw frames. Simple jaw frames can only simulate simple opening and closing movements, so it is difficult to achieve good restoration effects for complex patients. For semi-adjustable jaw frames and fully adjustable jaw frames, a face bow is needed to transfer the patient's maxillary dentition model to the jaw frame, and then the mandibular dentition model is transferred to the jaw frame according to the position of the maxillary dentition. The traditional method of transferring the maxillary frame based on the jaw position relationship has the following shortcomings:

[0004] 1. The semi-adjustable jaw frame, which is the most commonly used in clinical applications, can only partially simulate the patient's protrusive and lateral movements. Although it basically meets the needs of daily clinical use, for some patients, especially those who need aesthetic restoration of anterior teeth, the restorations made with the semi-adjustable jaw frame may be difficult to achieve the expected treatment effect. Although the fully adjustable jaw frame can simulate the patient's mandibular movement more completely, the operation is cumbersome, the equipment is complex, and recording is very inconvenient.

[0005] 2. Traditional face bows are heavy, take a long time to operate, and provide poor patient experience.

[0006] 3. With the advent of the digital age, doctors and technicians can adjust the shape of restorations such as crowns or veneers through software design to achieve the most ideal effect in function and aesthetics, and then output digital files to obtain the final restoration through cutting or 3D printing; however, the traditional restoration process is time-consuming and requires a high level of manual skill from technicians, making it difficult to make the final restoration consistent with the design.

[0007] 4. The aesthetic restoration of anterior teeth needs to consider red and white aesthetics. The traditional method of transferring the maxillary frame of the dentition model with the face bow can only obtain the approximate relationship between the dentition and the joints, the gums and the crowns. It is impossible to obtain the relationship between the lips and teeth when the patient smiles or laughs, making it difficult to carry out a more accurate smile design. Summary of the invention

[0008] The technical problem to be solved by the present invention is that the traditional face bow is heavy, complex in structure and single in function; the present invention provides a new face bow and its application to solve the above problems.

[0009] The present invention is achieved through the following technical solutions:

[0010] A new type of face bow comprises a face mask frame which is in a cross shape and is provided with a connecting piece for connecting a fork or a support; a groove for accommodating a radiation-blocking gutta-percha is provided on the outer surface of the face mask frame and along the cross shape.

[0011] Based on the problems existing in traditional face bows and jaw relationship transfer, the present invention provides a novel face bow, which adopts a cross-shaped face bow structure design, so that the upper, lower, left and right brackets of the cross-shaped face bow correspond to the nose, chin, left side and right side of the patient's face respectively: on the one hand, it is beneficial to greatly simplify the structure and reduce the weight, and at the same time conform to the facial features of the human body, so that the upper, lower, left and right brackets of the cross-shaped face bow are respectively aligned with the nose, chin, left side and right side of the patient's face for fixation, avoiding large-area occlusion of the patient's face and reducing interference with face scanning; on the other hand, the grooves for accommodating the radiation-blocking gutta-percha are distributed in a cross shape along the face bow, which can effectively expand the application function of the face bow, facilitate the use of the face bow in virtual jaw relationship transfer or construction of virtual patients and other operations, and help improve the fitting accuracy of subsequent data processing.

[0012] Further preferably, the groove for accommodating the radiation-blocking gutta-percha is a continuous cross-shaped groove, or is a plurality of independent grooves regularly distributed in a cross shape.

[0013] The groove can be a continuous cross-shaped groove structure, that is, a cross-shaped groove interconnected in all directions. In order to improve the fitting accuracy, the present invention preferably sets a plurality of independent grooves, and all the grooves are regularly distributed along the cross-shaped direction of the facial mask frame. Finally, all the grooves form a cross shape. When in use, scanning ray-blocking gutta-percha is injected into each groove.

[0014] Further preferably, the grooves for accommodating the radiation-blocking gutta-percha are a plurality of independent grooves regularly distributed in a cross shape; and the notch shape of each groove is a polygonal structure.

[0015] In order to further improve the fitting accuracy of the face bow during the digital processing, the present invention designs the groove to have a polygonal structure, and the internal shape of the groove can be the same shape as the groove or a different shape; when using the face bow, the placement and installation direction of each polygon and the relative installation directions of all polygons are set to improve the fitting accuracy.

[0016] Further preferably, the grooves have a notch shape including a triangle and a quadrilateral; and the grooves with a triangular notch shape and the grooves with a quadrilateral notch shape are distributed alternately.

[0017] The present invention further optimizes the design of the groove notch shape to improve the fitting accuracy of the face bow during the digital processing process, such as to improve the fitting accuracy of the CBCT and the face scan, and preferably designs the grooves with triangular shapes and the grooves with quadrilateral shapes to be alternately distributed, such as equilateral triangles and squares; when in use, the vertex angles of all triangles can be set to face the same direction as the direction from the chin to the top of the forehead of the face, and each square is also set to be placed upright in the direction from the chin to the top of the forehead of the face.

[0018] Further preferably, a plurality of protrusions are provided on the outer surface of the facial mask frame, and all the protrusions are distributed in an array along the cross direction of the facial mask frame to form a wall-like structure.

[0019] The present invention arranges a "castle wall structure" on the side of the mask frame facing away from the face, and the "castle wall structure" is composed of a plurality of protrusions distributed in an array, each of which can be used as a fitting mark point between the face scan of the mask wearing the face bow and the face bow model scan itself, and the fitting accuracy is high.

[0020] Further preferably, the four brackets of the facial mask frame are clamped and fixed on the patient's face by plastic deformation.

[0021] The four upper, lower, left and right brackets of the cross-shaped facial mask frame correspond to the nose, chin, left side and right side of the patient's face respectively. The facial mask frame can be clamped at the corresponding position of the face by four brackets, or pasted at the corresponding position, so that the facial mask frame can cover the facial area near the corresponding oral cavity like a mask. The preferred design of the present invention is that the four brackets of the facial mask frame are clamped and fixed on the patient's face by plastic deformation. Among the four brackets of the facial mask frame, each bracket is made of plastic deformation material or structure, and each bracket can be bent or curved as a whole; or at least one section of each bracket can be plastically deformed to achieve clamping and fixing. When in use, an external force is applied to a bracket of the facial mask frame to make the corresponding bracket bend or bend as close to the corresponding position of the patient's face as possible, so that the facial frame is attached to the face as a whole, and when the external force is withdrawn, the current claw attachment state remains unchanged; at the end of use, an external force can be applied again to make a bracket of the facial mask frame away from the corresponding position of the patient's face, and the facial mask frame can be removed.

[0022] Further preferably, the facial mask frame includes a cross-shaped body and a clamping arm, the four free ends of the cross-shaped body are each provided with a clamping arm, the clamping arm is rotatably connected to the four free ends of the L-shaped body, and the rotation axis of the clamping arm is perpendicular to the axis of the bracket.

[0023] The preferred design of the face mask frame main structure of the present invention consists of a cross-shaped main body and a clamping arm. The clamping arm can be adjusted according to the patient's face shape. The rotation angle of the clamping arm and the corresponding bracket can reach 360°. The unique connection structure can freely adjust the angle to fit as close to the patient's face as possible and reduce fitting errors.

[0024] Further preferably, the free ends of the four brackets of the cross-shaped body are each provided with a sleeve I, one end of the clamping arm is provided with a sleeve II, and an internal thread is provided in the sleeve I or the sleeve II; a bolt is simultaneously passed through the sleeve I and the sleeve II and is threadedly connected to the sleeve I or the sleeve II, thereby achieving a fixed connection between the bracket and the clamping arm.

[0025] The present invention adopts a shaft sleeve and a bolt adapter to realize the hinged connection between the clamping arm and the cross-shaped main body bracket; only one of the shaft sleeves has a thread, and when in use, only the bolt needs to be loosened, and the clamping arm can rotate freely. When it is rotated to the corresponding position, the bolt is tightened, and the clamping arm and the bracket can be fixed due to friction.

[0026] Further preferably, the connecting member adopts a connecting rod, one end of which is connected to the face mask frame, and the other end of the connecting rod is provided with a polygonal limit block; one end of a fork or a support adapted to the connecting rod is provided with a polygonal limit groove adapted to the polygonal limit block; the polygonal limit groove is snap-fitted with the polygonal limit block, and the fixed connection between the fork or the support and the connecting member is achieved by screws penetrating the polygonal limit block and the polygonal limit groove at the same time.

[0027] The joint support / joint fork of the present invention can be detachably mounted on the face mask frame. Only one face bow is needed and the joint support or joint fork can be replaced to be used for different patients, which is convenient, fast and hygienic. The special connection structure can effectively prevent the joint support / joint fork from twisting with the face bow.

[0028] Further preferably, it further comprises a plurality of radiographic imaging markers, wherein the radiographic imaging markers are used to be fixed at the positions of facial scanning points.

[0029] The present invention also designs a radiographic marker, which, when used, is fixed at the position of facial scanning points, such as the patient's bilateral condylar points, left and / or lateral infraorbital foramen points, chin points, and frontoparietal points, so as to facilitate point selection and alignment of different scanning models during the digital fitting process of the face bow.

[0030] Further preferably, the radiological imaging marker is fixed on the face and is square in shape in the scanning direction.

[0031] The radiographic marker of the present invention is designed to have a polygonal shape, preferably a square. The line angles of the square marking points are obvious, which is convenient for point selection and alignment during fitting.

[0032] The application of the above-mentioned novel facebow in the clinical process of oral restoration includes the following steps:

[0033] S1. Inject X-ray-opaque gutta-percha into the groove of the face mask frame;

[0034] S2. Fixing radiographic markers on the patient's face, wherein the radiographic markers are fixed at the patient's bilateral condylar points, left and / or lateral infraorbital foramen points, chin points, and frontal-parietal points;

[0035] S3. Put the new facebow on the patient;

[0036] S4. Obtaining a face scan model of the patient wearing a face bow and a face scan model of the patient without a face bow through face scanning;

[0037] S5. Obtain the whole facebow model connected with the support / fork by mouth scanning or model scanning;

[0038] S6. Obtain the maxillary and mandibular dentition models of the patient without wearing a face bow through oral scanning.

[0039] Further preferably, in S4, the face scanning model without the face bow includes one or more of a model of the patient's upper and lower teeth occluding to a cusp interdigitation state, a model of a smiling state, and a model of a laughing state.

[0040] Further preferably, the virtual jaw position transfer operation is performed based on steps S1-S6, comprising the following steps:

[0041] S11. According to the common cross shape of the new face bow, fit the face scan model with the face bow and the face bow overall model;

[0042] S12. According to the occlusal record of the patient's maxillary dentition on the face bow during the face scanning process, the maxillary dentition model is fitted to the overall face bow model, so that the maxillary dentition is fitted to the face scanning model wearing the face bow;

[0043] S13. Determine the hinge axis and jaw frame plane of the virtual jaw frame based on the scanning points of the condylar points on both sides and the left and / or lateral infraorbital foramen points obtained by the face scan;

[0044] S14. According to the positional relationship between the maxillary dentition and the mandibular dentition obtained by oral scanning, the mandibular dentition model is matched with the maxillary dentition model to obtain the positional relationship between the maxillary dentition and the mandibular dentition and the hinge axis and the plane of the jaw frame, and finally obtain the preliminary virtual jaw relationship transfer.

[0045] Further preferably, in step S6, a maxillary dentition model, a mandibular dentition model, and an occlusal model of the maxillary dentition and the mandibular dentition of the patient without wearing a face bow are obtained by mouth scanning, wherein the occlusal relationship in the occlusal model includes a protrusive occlusion, or the occlusal relationship includes a protrusive occlusion and a left-right lateral occlusion;

[0046] The virtual jaw relationship transfer operation also includes step S15: according to the occlusal model of the maxillary dentition and the mandibular dentition, in the virtual jaw relationship, the mandibular dentition is matched with the maxillary dentition accordingly, the protrusive condylar guide and the lateral condylar guide are calculated, and a semi-adjustable virtual jaw relationship transfer is obtained.

[0047] Further preferably, the operation of constructing a virtual patient based on steps S1-S6 includes the following steps:

[0048] S21. According to the common cross shape of the new face bow, fit the face scan model with the face bow and the whole face bow model;

[0049] S22. According to the occlusal record of the patient's maxillary dentition on the facebow during the face scanning process, the maxillary dentition model is fitted to the facebow overall model, so that the maxillary dentition is fitted to the face scanning model wearing the facebow;

[0050] S23. Fitting the face scan model without the face bow and the face scan model with the face bow fitted with the maxillary dentition obtained in step S22 according to the frontal site scanning points, so as to fit the maxillary dentition to the face scan model without the face bow;

[0051] S24. According to the positional relationship between the maxillary dentition and the mandibular dentition obtained by the oral scan, the mandibular dentition model is matched with the maxillary dentition model, so that the mandibular dentition is fitted to the facial scan model with the face bow, and the positional relationship between the mandibular dentition and the chin point scanning point is obtained;

[0052] S25. Based on the positional relationship between the mandibular dentition and the chin scanning points obtained in step S24, the positional relationship between the mandibular dentition and the chin scanning points is fitted with the model of the smiling state and / or the model of the laughing state obtained by the face scan without wearing a face bow, so as to transfer the mandibular dentition when smiling or laughing to the model of the smiling state and / or the model of the laughing state obtained by the face scan without wearing a face bow.

[0053] The present invention has the following advantages and beneficial effects:

[0054] 1. The present invention provides a novel face bow, which adopts a cross-shaped face bow structure design, so that the upper, lower, left and right brackets of the cross-shaped face bow correspond to the nose, chin, left side and right side of the patient's face respectively: on the one hand, it is conducive to greatly simplifying the structure and reducing the weight, and at the same time conforms to the facial features of the human body, so that the upper, lower, left and right brackets of the cross-shaped face bow are respectively aligned with the nose, chin, left side and right side of the patient's face for fixation, avoiding large-area obstruction of the patient's face and reducing interference with facial scanning; on the other hand, the grooves for accommodating the radiation-blocking gutta-percha are distributed in a cross shape along the face bow, which can effectively expand the application function of the face bow, facilitate the use of the face bow in virtual jaw relationship transfer or construction of virtual patients and other operations, and help improve the fitting accuracy of subsequent data processing.

[0055] The present invention also designs a radiographic marker, which, when used, is fixed at the position of facial scanning points, such as the patient's bilateral condylar points, left and / or lateral infraorbital foramen points, chin points, and frontoparietal points, so as to facilitate point selection and alignment of different scanning models during the digital fitting process of the face bow.

[0056] 2. The new facebow provided by the present invention can construct a complete virtual patient, thereby facilitating the following technical effects in the clinical process of oral restoration:

[0057] (1) Use the face bow to transfer the patient's maxillary dentition model to the face scan model, and then transfer the patient's mandibular dentition model to the face scan model based on the three points of the mandibular chin. Evaluate the patient's smile line when smiling and laughing from a three-dimensional perspective, guide the production of restorations, and guide the trimming of gums through the designed restorations. This is very important for patients with aesthetic restorations and aesthetic implants of anterior teeth. Traditional aesthetic wax models can only partially guide the production of the final restoration, and it is impossible to see the relationship between the patient's teeth and lips. The currently commonly used 2D digital smile design is mostly used for doctor-patient communication and has little value in guiding the production of the final restoration. This face bow perfectly combines the advantages of both and solves the shortcomings. From a three-dimensional level, it can fully show the patient the design of the restoration and the relationship between teeth and lips. At the same time, it can output stl files to directly print or cut temporary teeth or final restorations.

[0058] (2) Similar to a semi-adjustable jaw frame, the patient's maxillary dentition model is transferred to the facial scan model. The virtual jaw frame plane and hinge axis are determined by the square marking points attached to the left and right condyles and the left / right infraorbital foramen. Based on this, the patient's maxillary dentition model can be transferred to the virtual jaw frame. The mandibular dentition model is then transferred to the virtual jaw frame based on the staggered occlusion. The protrusive occlusion recorded by the oral scan is used to align the mandibular dentition position in this state, calculate the protrusive condylar guide, and then calculate the lateral condylar guide according to the formula to complete the transfer of the semi-adjustable virtual jaw frame. The clinical operation process of this method is fast, the patient experience is good, and the subsequent data processing is simple.

[0059] (3) In the current digital guide design, only the central occlusion of the upper and lower jaws is usually used as a reference when arranging virtual restorations, which is relatively inaccurate. Especially for patients with aesthetic anterior tooth implants, it is very important to be guided by restoration. Accurate restoration design can accurately indicate the placement of implants and abutments. This face bow can combine the patient's facial scan, oral scan, and CBCT into one. It can directly design the restoration in the virtual patient's mouth according to the lip-tooth relationship and occlusion relationship, and then accurately adjust the implant and abutment based on the restoration. Finally, a guide is generated, which can maximize the reasonable position of the implant, optimize the final effect of implant restoration, and reduce the risk of bone grafting and postoperative complications. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0061] Figure 1 It is a schematic diagram of the novel face bow structure of the present invention, comprising a cross-shaped body and a clamping arm;

[0062] Figure 2 It is a schematic diagram of the novel face bow structure of the present invention;

[0063] Figure 3 It is a schematic diagram of the local structure of the connection between the cross-shaped main body and the clamping arm of the present invention;

[0064] Figure 4 It is a schematic diagram of the distribution structure of the protrusions on the cross-shaped body of the present invention;

[0065] Figure 5 The diagram is a schematic diagram of the structure of a joint support or a joint fork; (a) in the figure represents a joint support, and (b) represents a joint fork;

[0066] Figure 6 The present invention is a schematic diagram of the connection structure between the coupling support or coupling fork and the connecting piece; (a) is a top view, and (b) is a side view.

[0067] Markings and corresponding parts names in the accompanying drawings: 1-face mask frame, 101-cross-shaped body, 102-clamping arm, 2-connecting piece, 3-groove, 4-protrusion, 5-bolt, 6-sleeve I, 7-sleeve II, 8-polygonal limit block, 9-polygonal limit groove, 10-screw, 11-radiological imaging marker. DETAILED DESCRIPTION

[0068] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0069] Example 1

[0070] The present embodiment provides a new type of face bow, including a face mask frame 1, which is in a cross shape, and can be formed by connecting two brackets into a cross structure, or by splicing four brackets into a cross structure, or by an integrated cross structure, and can be a standard cross structure or a cross-like structure. The present embodiment adopts an integrated cross structure, as shown in Figures 1 and 2. The four brackets of the cross-shaped face mask frame 1 correspond to the nose, chin, left side of the face and right side of the face of the patient respectively. The face mask frame 1 can be clamped at the corresponding position of the face by four brackets, or pasted at the corresponding position, so that the face mask frame 1 can be similar to a mask covering the facial area near the corresponding oral cavity. The face mask frame 1 is provided with a connector 2 for connecting a fork or a support, which is a detachable connection. Preferably, the connector 2 is arranged at the center of the cross mask. A groove 3 for accommodating a radiopaque gutta-percha is provided on the outer surface of the face mask frame 1 and along the cross direction. The radiopaque gutta-percha is an X-ray radiopaque gutta-percha.

[0071] The main body of the occlusal support is a C-shaped flat plate with an elliptical hole in the middle for preventing the silicone rubber material from overflowing and demolding. The main body of the occlusal fork is a C-shaped rod with a triangular protrusion extending from the inside, which is used to fix the occlusal fork to the wax rim in the mouth of edentulous patients.

[0072] Example 2

[0073] Based on the embodiment 1, the groove 3 for accommodating the radiation-blocking gutta-percha can be a continuous cross-shaped groove. In this embodiment, a plurality of mutually independent grooves are regularly distributed along the cross-shaped direction on the face mask frame 1 in a cross-shaped shape, and the notch shape of each groove 3 is a polygonal structure; further preferably, the notch shape of the groove 3 includes a triangle and a quadrilateral, and the grooves 3 with a triangular notch shape and the grooves 3 with a quadrilateral notch shape are alternately distributed, such as Figure 1 shown.

[0074] Example 3

[0075] Based on the further improvement of Example 2, the outer surface of the face mask frame 1 is further provided with a plurality of protrusions 4, all of which are arranged in an array along the cross direction of the face mask frame 1, forming a wall-like structure; and each of the four brackets of the face mask frame 1 is provided with two rows of protrusions 4, such as Figure 2 described.

[0076] Example 4

[0077] Based on the further improvement of Example 3, two structures for fixing the face mask frame 1 on the face are provided:

[0078] The first structure: Figure 2As shown, the four brackets of the facial mask frame 1 are clamped and fixed on the patient's face by plastic deformation. Among the four brackets of the facial mask frame 1, each bracket is made of plastic deformation material or structure, and each bracket can undergo plastic deformation such as bending or curving as a whole; or at least one section of each bracket can undergo plastic deformation to achieve clamping and fixing.

[0079] The second structure: Figure 1 and 3 As shown, the face mask frame 1 includes a cross-shaped body 101 and four clamping arms 102. The four bracket free ends of the cross-shaped body 101 are each provided with a clamping arm 102. The clamping arm 102 is rotatably connected to the four bracket free ends of the cross-shaped body 101, and the rotation axis of the clamping arm 102 is perpendicular to the axis of the bracket. Specifically, the four bracket free ends of the cross-shaped body 101 are each provided with a sleeve I6, one end of the clamping arm 102 is provided with a sleeve II7, and the sleeve I6 or the sleeve II7 is provided with an internal thread; the bolt 5 simultaneously penetrates the sleeve I6 and the sleeve II7 and is threadedly connected to the sleeve I6 or the sleeve II7, so as to realize the fixed connection between the bracket and the clamping arm 102.

[0080] In addition, the present embodiment provides a specific structure of the connecting member 2, which adopts a connecting rod, one end of which is connected to the face mask frame 1, and the other end of the connecting rod is provided with a polygonal limit block 8; one end of a fork or a support adapted to the connecting rod is provided with a polygonal limit groove 9 adapted to the polygonal limit block 8; the polygonal limit groove 9 is snap-fitted and adapted to the polygonal limit block 8, and the fork or the support is fixedly connected to the connecting member 2 after the screw 10 penetrates the polygonal limit block 8 and the polygonal limit groove 9 at the same time. Here, the polygonal limit block 8 and the polygonal limit groove 9 are both regular hexagons.

[0081] Example 5

[0082] Based on the further improvement of Example 4, it also includes a plurality of radiographic markers 13, which are used to be fixed at the positions of facial scanning points; the radiographic marker 11 is fixed on the face and is polygonal in the scanning direction, and a square is preferably used in this embodiment. During use, the radiographic marker 11 is fixed on the patient's face, and the radiographic marker 11 is fixed at the facial fixed positions including the patient's bilateral condylar points, left and / or lateral infraorbital foramen points, chin point, and frontal parietal point.

[0083] Example 6

[0084] Based on the application of a new type of face bow in the clinical process of oral restoration through Example 5, the face bow is shaped as follows Figure 1 The specific application method is as follows:

[0085] S1. Inject radiopaque gutta-percha into the grooves on the cross-shaped body and the clamping arms.

[0086] S2. Fix radiographic markers 11 on the patient's face. Specifically, square radiographic markers are attached to the condylar points on both sides of the patient, and the left or right infraorbital foramen points to indicate the orbitoauricular plane-virtual jaw frame plane; square radiographic markers are attached to three points on the patient's forehead where the skin is not easily displaced, which are used to fit all face scans in the 3D software; square radiographic markers are attached to three points on the patient's chin where the skin is not easily displaced, and the mandible is not transferred with high precision, which is used to analyze the lip-tooth relationship when smiling or laughing. Among them, the three chin sites and the three forehead sites are arranged in a triangle.

[0087] S3. Put a new type of face bow on the patient. Specifically:

[0088] (1) For patients with dentition: Place a silicone rubber bite record material on the top of the occlusal support to record the patient's maxillary dentition. Fix the new face bow to the occlusal support by tightening the screws. Put it back into the patient's mouth according to the maxillary dentition occlusal record. After confirming that it is in place, adjust the four clamping arms of the new face bow so that they are close to the corresponding position of the patient's face without obstruction, and finally tighten the bolts to fix the angle;

[0089] (2) For edentulous patients: restore the vertical distance between the upper and lower jaws of the patient through the wax occlusal ridge, insert the heated occlusal fork into the maxillary wax occlusal ridge, wait for it to cool and fix, and then fix the new face bow and occlusal fork by tightening the screws. Put the upper and lower wax occlusal ridges into the patient's mouth, confirm that they are in place, adjust the four clamping arms of the face bow so that they are close to the corresponding position of the patient's face without obstruction, and finally tighten the bolts to fix the angle.

[0090] S4. Obtain the face scan model of the patient wearing the face bow and the face scan model of the patient without the face bow through face scanning. Specifically:

[0091] (1) For patients with dentition: First, wear a face bow to scan the face, and obtain a face scan model with the face bow. Then remove the face bow to scan the face, and obtain a face scan model without the face bow. Specifically, the patient can be asked to take a face scan when biting to the intercusp position, smiling, and laughing, and obtain a face scan model of the patient's upper and lower dentition biting to the intercusp position, a face scan model of the smiling state, and a face scan model of the laughing state.

[0092] (2) For edentulous patients: First, scan the face with a face bow to obtain a face scan model with the face bow. Then loosen the screws at the connection between the face bow and the occlusal fork, remove the face bow, and scan the face with the occlusal fork in the wax occlusal ridge to obtain a face scan model without the face bow.

[0093] S5. Obtain the maxillary dentition model, mandibular dentition model and occlusion model of the maxillary dentition and mandibular dentition of the patient without wearing a face bow through mouth scanning, wherein the occlusion relationship in the occlusion model includes protrusive occlusion, or the occlusion relationship includes protrusive occlusion and left and right lateral occlusion; in addition, obtain the whole face bow model connected with occlusal rest / occlusal fork through mouth scanning. Specifically:

[0094] (1) For patients with dentition: remove the occlusal support and face bow, perform an oral scan or mold scan of the entire face bow with the occlusal support, and obtain a complete model of the face bow connected with the occlusal support / occlusal fork. Also perform an oral scan of the patient's maxillary and mandibular dentition and cusp staggered occlusion, protrusive occlusion, and left and right lateral occlusion to obtain the maxillary dentition model, mandibular dentition model, and occlusal model of the maxillary and mandibular dentition without the face bow.

[0095] (2) For edentulous patients: remove the wax rim and fork, reconnect the face bow to the fork, spray the entire surface of the face bow with powder, and then perform a full mouth scan to obtain a full model of the face bow connected with the fork and rim. Also perform a full mouth scan of the patient's upper and lower jaws.

[0096] S6. Take CBCT: Take CBCT after wearing the face bow.

[0097] Example 7

[0098] This embodiment provides an application of a new facebow in the clinical process of oral restoration. Based on steps S1-S5 in Example 6, a virtual jaw position transfer operation is performed. The specific steps are as follows:

[0099] S11. According to the common cross shape of the new face bow, fit the face scan model with the face bow and the face bow overall model;

[0100] S12. According to the occlusal record of the patient's maxillary dentition on the face bow during the face scanning process, the maxillary dentition model is fitted to the overall face bow model, so that the maxillary dentition is fitted to the face scanning model wearing the face bow;

[0101] S13. Determine the hinge axis and jaw frame plane of the virtual jaw frame based on the scanning points of the condylar points on both sides and the left and / or lateral infraorbital foramen points obtained by the face scan;

[0102] S14. Based on the occlusal position relationship of the maxillary and mandibular dentition obtained by oral scanning, the mandibular dentition model is matched with the maxillary dentition model to obtain the positional relationship between the maxillary and mandibular dentition and the hinge axis and the jaw frame plane, and finally obtain a preliminary virtual jaw position transfer.

[0103] S15. According to the occlusal model of the maxillary dentition and the mandibular dentition, i.e., the protrusive occlusion and the left and right lateral occlusion, in the virtual jaw relationship, the mandibular dentition is matched with the maxillary dentition accordingly, and the protrusive condylar guide and the lateral condylar guide are calculated; alternatively, the mandibular dentition model is only aligned according to the protrusive occlusion, the protrusive condylar guide is calculated, and then the lateral condylar guide is calculated based on the protrusive condylar guide; finally, a semi-adjustable virtual jaw relationship transfer is obtained.

[0104] Example 8

[0105] This embodiment provides an application of a novel facebow in a clinical process of oral restoration, and the operation of constructing a virtual patient based on steps S1-S5 in embodiment 6 includes the following steps:

[0106] S21. According to the common cross shape of the new face bow, fit the face scan model with the face bow and the whole face bow model;

[0107] S22. According to the occlusal record of the patient's maxillary dentition on the face bow during the face scanning process, the maxillary dentition model is fitted to the overall face bow model, so that the maxillary dentition is fitted to the face scanning model wearing the face bow;

[0108] S23. According to the scanning points at the three locations on the forehead and the top, fit the face scan model without face bow and the face scan model with face bow obtained in step S22 with maxillary dentition, so as to fit the maxillary dentition to the face scan model without face bow. At this time, the face scan model without face bow includes the face scan model of the upper and lower dentition occluding to the cusp staggered state, the face scan model of the smiling state and the face scan model of the laughing state.

[0109] S24. Based on the model of the patient's upper and lower dentition occluded to the cusp interdigitation state obtained by oral scanning, the mandibular dentition model is matched with the maxillary dentition model to fit the mandibular dentition to the facial scan model with the face bow, and the positional relationship between the mandibular dentition and the three-point scanning points of the chin is obtained.

[0110] S25. Based on the positional relationship between the mandibular dentition and the three-point chin scanning points obtained in step S24, the positional relationship between the mandibular dentition and the chin scanning points is fitted with the smiling state model and / or the laughing state model obtained by face scanning without wearing a face bow, so as to achieve the transfer of the mandibular dentition when smiling or laughing to the smiling state model and / or the laughing state model obtained by face scanning without wearing a face bow. Based on this, a relatively complete virtual patient is constructed, the patient's 3D smile line is evaluated, and the design and production of the restoration is guided.

[0111] Example 9

[0112] The present embodiment provides a novel application of a face bow in the clinical process of oral restoration, and realizes the combination of fitting face scan and CBCT based on Example 6: perform steps S1, S3, S4 and S6 in sequence, fit the face scan of the patient wearing the face bow and the CBCT wearing the face bow through the common gutta-percha blocking points on the cross face bow, and fit the patient's CBCT into the face scan model.

[0113] Based on Examples 6-9, the combination of fitting face scan and CBCT is achieved. The combination of fitting face scan, oral scan and CBCT is achieved.

[0114] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A face bow, comprising a face mask frame (1), characterized in that: The facial mask frame (1) is in the shape of a cross, and is provided with a connecting piece (2) for connecting a fork or a support; a groove (3) for accommodating a radiation-blocking gutta-percha is provided on the outer surface of the facial mask frame (1) and along the cross-shaped direction; The outer surface of the face mask frame (1) is also provided with a plurality of protrusions (4), all of which are arranged in an array along the cross direction of the face mask frame (1) to form a wall-like structure; The face mask frame (1) comprises a cross-shaped main body (101) and a clamping arm (102), wherein the four bracket free ends of the cross-shaped main body (101) are each provided with a clamping arm (102), and the clamping arm (102) is rotatably connected to the four bracket free ends of the cross-shaped main body (101), and the rotation axis of the clamping arm (102) is perpendicular to the axis of the bracket where it is located.

2. A face bow according to claim 1, characterized in that: The groove (3) for accommodating the radiation-blocking gutta-percha is a continuous cross-shaped groove, or a plurality of independent grooves regularly distributed in a cross shape.

3. A face bow according to claim 2, characterized in that: The grooves (3) for accommodating the radiation-blocking gutta-percha are a plurality of independent grooves regularly distributed in a cross shape; and the notch shape of each groove (3) is a polygonal structure.

4. A face bow according to claim 3, characterized in that: The grooves (3) have a notch shape of a triangle and a quadrilateral; and the grooves (3) with a notch shape of a triangle and the grooves (3) with a notch shape of a quadrilateral are distributed alternately.

5. The face bow according to claim 1, characterized in that: The four brackets of the face mask frame (1) are clamped and fixed on the patient's face by plastic deformation.

6. A face bow according to any one of claims 1 to 5, characterized in that: It also includes a plurality of radiographic markers (11), which are used to be fixed at facial scanning point positions.

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