Chin forming guide plate system for changing short and flat state of chin and manufacturing method of chin forming guide plate system

Abstract

The invention provides a chin forming guide plate system for changing the short and flat state of the chin and a manufacturing method thereof.The chin forming guide plate system comprises an osteotomy guide plate and a positioning guide plate, and the osteotomy guide plate comprises a first positioning hole, a second positioning hole and a third positioning hole; a first positioning hole, a second positioning hole and a third positioning hole are formed in the lower jaw fixing area, cutting guide paths of a first osteotomy bone block, a second osteotomy bone block and an osteotomy removal bone block are limited, and the first positioning hole, the second positioning hole and the third positioning hole correspond to connecting hole positions in the first osteotomy bone block, the second osteotomy bone block and the lower jaw fixing area respectively; the positioning guide plate is used for limiting the cut first osteotomy bone block and the cut second osteotomy bone block at target positions according to an operation plan, and comprises a fourth positioning hole, a fifth positioning hole and a sixth positioning hole; the fourth positioning hole, the fifth positioning hole and the sixth positioning hole correspond to connecting hole positions in the first osteotomy bone block, the second osteotomy bone block and the lower jawbone retention area respectively.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a chin shaping guide plate system for changing a short and flat chin and a manufacturing method thereof, which is suitable for the plastic surgery and repair of short chin, wide and flat chin and other jaw deformities. Background Art

[0002] Genioplasty is a classic maxillofacial surgery procedure used to treat various jaw deformities, especially for correcting mandibular chin deformities in adults. Genioplasty guides are used to assist in chin surgery, helping with precise positioning and shaping, and improving surgical accuracy. Patients with unsightly chins often undergo genioplasty to address chin morphology, such as chin retraction, asymmetric chin deviation, chin protrusion, or a chin that is too short or too long. Guiding osteotomy and bone movement with a genioplasty guide helps accurately restore the pre-operative design and achieve the desired effect of improving facial contours.

[0003] During genioplasty surgery, the surgeon uses pre-simulated osteotomy fragments, moves them, and determines the aesthetically pleasing chin shape after surgery to determine the final position of the patient's chin fragments. Conventional standardized osteotomies cannot alter the patient's original chin shape. If the original chin is wide and flat, the final chin shape will remain wide and flat. Surgeons can only rely on standardized osteotomy templates and their own experience to resect the chin fragments during surgery to achieve the final chin shape and then fix the titanium plate. This can easily lead to unsightly chin shapes during the surgery, necessitating further extensive bone grinding or bone removal, resulting in prolonged surgery and risks such as postoperative soft tissue swelling.

[0004] Genioplasty surgery using traditional genioplasty guides still has the following technical bottlenecks:

[0005] (1) Limitations of morphological adaptation: When using a standardized osteotomy template, for cases of wide and flat chin deformity with a chin base width exceeding 35 mm and a curvature radius greater than 15 mm, conventional midline bone removal is difficult to reconstruct the ideal chin-neck angle (usually maintained at 105°–120°);

[0006] (2) Anatomical avoidance defects: When the distance between the mental foramina varies by 6 to 10 mm between individuals, the traditional guide plate lacks a three-dimensional avoidance design for the neurovascular bundle, and the incidence of postoperative sensory impairment can reach 18% to 25%;

[0007] (3) Insufficient reduction accuracy: The matching error between the free bone fragment and the base bone joint surface is often greater than 2mm, which makes titanium plate fixation difficult and bone healing delayed. Summary of the Invention

[0008] In view of the problems in the prior art, the present invention provides a chin shaping guide plate system for changing the short and flat chin shape, the chin shaping guide plate system comprising:

[0009] an osteotomy guide plate, the osteotomy guide plate including a first positioning hole, a second positioning hole, and a third positioning hole, and defining a cutting guide path for the first osteotomy bone fragment, the second osteotomy bone fragment, and the osteotomy removal bone fragment, the first positioning hole, the second positioning hole, and the third positioning hole corresponding to the connection hole positions on the first osteotomy bone fragment, the second osteotomy bone fragment, and the mandibular retention area, respectively;

[0010] A positioning guide plate is used to limit the first and second osteotomy bone fragments to the target positions according to the surgical plan; the positioning guide plate includes a fourth positioning hole, a fifth positioning hole and a sixth positioning hole, and the fourth positioning hole, the fifth positioning hole and the sixth positioning hole respectively correspond to the connection hole positions on the first osteotomy bone fragment, the second osteotomy bone fragment and the mandibular retention area.

[0011] Furthermore, the genioplasty guide system further includes a bite plate, which is connected to the osteotomy guide.

[0012] Furthermore, the osteotomy guide plate includes a first edge, a second edge, a third edge and a fourth edge, wherein the first edge and the second edge define a cutting guide path for the first osteotomy bone fragment, and the third edge and the fourth edge define a cutting guide path for the second osteotomy bone fragment.

[0013] Furthermore, the osteotomy bone removal block is located between the first osteotomy bone block and the second osteotomy bone block, and the first edge, the second edge, the third edge and the fourth edge jointly define a cutting guide path of the osteotomy bone removal block.

[0014] Furthermore, the first osteotomy bone fragment and the second osteotomy bone fragment respectively reach their target positions from their initial positions by relative rotation, or relative rotation combined with translation, or relative rotation combined with translation and downward movement, with corresponding preset reference points as centers.

[0015] Furthermore, edge regions where the first edge, the second edge, the third edge, and the fourth edge are located are respectively thickened.

[0016] Furthermore, a limiting slot is provided on the extension path of the first edge and the third edge.

[0017] Furthermore, there are at least two of the first positioning hole, the second positioning hole, and the third positioning hole.

[0018] The present invention also provides a method for manufacturing a chin shaping guide plate system for changing a short and flat chin, which is characterized by comprising:

[0019] Obtain a preoperative digital mandibular model;

[0020] Determining an osteotomy line according to the surgical plan, wherein the osteotomy line is suitable for segmenting a first osteotomy bone block, a second osteotomy bone block, and an osteotomy removal bone block from the digital mandibular model;

[0021] generating an osteotomy guide plate body according to the digital mandibular model, wherein the osteotomy guide plate body includes an edge corresponding to the osteotomy line;

[0022] A first positioning hole, a second positioning hole and a third positioning hole are provided on the osteotomy guide plate body, which correspond to the connection holes on the first osteotomy bone block, the second osteotomy bone block and the mandibular retention area respectively;

[0023] Acquiring a mandibular target model updated after surgical planning based on the digital mandibular model;

[0024] generating a positioning guide body according to the mandibular target model;

[0025] A fourth positioning hole, a fifth positioning hole and a sixth positioning hole are provided on the positioning guide plate body, which correspond to the connection hole positions on the first osteotomy bone block, the second osteotomy bone block and the mandibular retention area respectively.

[0026] Furthermore, the production method further comprises:

[0027] generating a bite plate according to the digital mandibular model;

[0028] The bite plate is connected to the osteotomy guide body.

[0029] The main purpose of the present invention is to provide a new surgical method designed for patients with short, wide, and flat chins to effectively improve the aesthetic appearance of the chin, and to provide a corresponding chin shaping guide system and its manufacturing method. Compared with previous surgical methods and standardized chin shaping guides, the present invention provides a new personalized chin shaping guide system with a new appearance, new functions, and new design for patients with short, wide, and flat chins. On this basis, the technical solution of the present invention also has the following beneficial effects:

[0030] 1. Through surgical simulation, the position, size and shape of the bone to be removed during surgery can be determined on the reconstructed model. Through the design and production of the osteotomy guide, the data of the bone to be removed can be accurately transferred to the surgical application, which can effectively avoid the damage caused by excessive bone removal during surgery and the prolonged operation time caused by repeated adjustment due to insufficient bone removal, making the surgical operation more convenient and time-saving.

[0031] 2. During the osteotomy guide design process, the positional relationship between the designed osteotomy line and the mental foramen can be visually observed from different angles, which can effectively avoid the most common complications of genioplasty osteotomy (intraoperative nerve damage, excessive bone removal leading to nonunion and difficulty in healing of bone wounds, prolonged surgery leading to intraoperative swelling and inflammation, etc.);

[0032] 3. Compared with the existing traditional genioplasty model analysis, the operation is simple, time-saving, and the surgical guidance is more intuitive and specific; clinical verification shows that this system can improve surgical accuracy, shorten operation time, and the postoperative chin symmetry index is significantly better than traditional procedures.

[0033] 4. The range of customized osteotomy and guide styles for genioplasty has been expanded, and the designed osteotomy and positioning guides are simple in structure, facilitating their widespread application.

[0034] 5. The osteotomy guide and positioning guide are designed to be separated. Once the osteotomy guide is fixed with screws, it can be removed after the bone is cut, which facilitates the bone cutting operation. The positioning guide can lock the final position of the mandibular bone fragment after being fixed with screws, which occupies a small area and can be removed after fixing the commercial titanium plate and titanium nails.

[0035] 6. The osteotomy guides are designed to avoid important anatomical locations such as tooth roots and inferior alveolar nerves, ensuring safe and secure osteotomy during surgery.

[0036] 7. The positioning guide is designed with consideration given to leaving space for fixing titanium plates and nails, making it as small as possible to facilitate the fixation of multiple bone fragments after locking the final position.

[0037] 8. The osteotomy plane is defined by the edge of the guide plate and has a fixed limit slot, which makes it convenient for the doctor to saw the bone closely along the osteotomy plane without considering the angle and direction, without damaging important anatomical structures, and making the cutting more accurate and precise.

[0038] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 1 is a schematic structural diagram of a guide plate component of a chin shaping guide plate system for changing a short and flat chin according to an embodiment of the present invention;

[0040] Figure 2 1 is a schematic structural diagram of a positioning guide plate of a chin shaping guide plate system for changing a short and flat chin according to an embodiment of the present invention;

[0041] Figure 3 yes Figure 1 A schematic structural diagram of an osteotomy guide in a guide component;

[0042] Figure 4 yes Figure 1 A bottom view of the bite plate in the guide plate assembly;

[0043] Figure 5 yes Figure 1 A schematic diagram of the structure of the guide plate component connected to the mandible;

[0044] Figure 6 yes Figure 2 Schematic diagram of the structure of the positioning guide connected to the mandible;

[0045] Figure 7 The present invention is a flowchart of a method for manufacturing a chin shaping guide system for changing a short and flat chin according to an embodiment of the present invention.

[0046] Description of reference numerals:

[0047] 1—first osteotomy block;

[0048] 2—second osteotomy block;

[0049] 3—Osteotomy to remove bone fragments;

[0050] 4—mandibular retention area;

[0051] 10—guide plate component;

[0052] 21—first osteotomy line;

[0053] 22—second osteotomy line;

[0054] 23—third osteotomy line;

[0055] 24—fourth osteotomy line;

[0056] 100—osteotomy guide;

[0057] 111—first positioning hole;

[0058] 112—second positioning hole;

[0059] 113—third positioning hole;

[0060] 121—first edge;

[0061] 122—Second Edge;

[0062] 123—third edge;

[0063] 124—Fourth Edge;

[0064] 131—first marginal area;

[0065] 132—second marginal area;

[0066] 133—third marginal area;

[0067] 134—Fourth Marginal Area;

[0068] 140—limiting card slot;

[0069] 200—connecting rod;

[0070] 300—occlusal splint;

[0071] 310—groove;

[0072] 400—Positioning guide;

[0073] 411—fourth positioning hole;

[0074] 412—fifth positioning hole;

[0075] 413 — sixth positioning hole;

[0076] 420—Stairs. DETAILED DESCRIPTION

[0077] In the description of the embodiments of the present invention, it should be understood that the terms "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the invention. The accompanying drawings are schematic or conceptual diagrams, and the relationships between the thickness and width of various parts, as well as the proportional relationships between various parts, etc., are not entirely consistent with their actual values.

[0078] Example 1

[0079] Figure 1 and Figure 2 The figures respectively show a guide plate component 10 and a positioning guide plate 400 of a chin shaping guide plate system for changing the short and flat chin shape according to an embodiment of the present invention, wherein the guide plate component 10 includes an osteotomy guide plate 100, a connecting rod 200 and a bite plate 300, and the osteotomy guide plate 100 is connected to the bite plate 300 via the connecting rod 200.

[0080] refer to Figure 3 and Figure 5As shown, the osteotomy guide plate 100 includes a first positioning hole 111 , a second positioning hole 112 , a third positioning hole 113 , and a first edge 121 , a second edge 122 , a third edge 123 , and a fourth edge 124 . The first edge 121, the second edge 122, the third edge 123, and the fourth edge 124 respectively correspond to the first osteotomy line 21, the second osteotomy line 22, the third osteotomy line 23, and the fourth osteotomy line 24 determined according to the surgical plan (each osteotomy line is represented by a dotted line and is appropriately extended), so that the first edge 121, the second edge 122, the third edge 123, and the fourth edge 124 provide guidance for cutting the mandible during surgery, wherein the first edge 121 and the second edge 122 can guide the cutting of the first osteotomy bone block 1, the third edge 123 and the fourth edge 124 can guide the cutting of the second osteotomy bone block 2, and the first edge 121, the second edge 122, the third edge 123, and the fourth edge 124 can guide the cutting of the osteotomy removal bone block 3 located between the first osteotomy bone block 1 and the second osteotomy bone block 2. According to the surgical plan, the cut first osteotomy bone block 1 and the second osteotomy bone block 2 are set at the target position to reconstruct the chin, with reference to FIG. Figure 6 As shown, in this embodiment, the first osteotomy bone block 1 and the second osteotomy bone block 2 are respectively rotated relative to each other to a predetermined position with the lowest point below the mental foramen on the same side as the center, and then translated to the midsagittal plane to be joined, that is, the two are in surface contact at the midsagittal plane, specifically the cutting surface defined by the second edge 122 and the fourth edge 124 of the first osteotomy bone block 1 and the second osteotomy bone block 2, respectively. Then, the first osteotomy bone block 1 and the second osteotomy bone block 2 are moved downward by a predetermined distance, at which point the first osteotomy bone block 1 and the second osteotomy bone block 2 are in their target positions. By removing the middle osteotomy bone block 3 and rotating, joining, and shifting the first osteotomy bone block 1 and the second osteotomy bone block 2 downward, the original short, wide, and flat chin morphology is effectively improved without the need for bone grinding and adjustment during the operation. It should be noted that, depending on the actual conditions of different patients and the different selected rotation center points, in other embodiments, the two osteotomy bone fragments can be placed in the target position only by rotation, or only by rotation combined with translation.

[0081] In this embodiment, to facilitate bone cutting during surgery, the first edge 121, second edge 122, third edge 123, and fourth edge 124, respectively, corresponding to the first edge region 131, second edge region 132, third edge region 133, and fourth edge region 134, are thickened to increase the thickness of each edge. Furthermore, limiting slots 140 are provided along the extension paths of the first edge 121 and the third edge 123, further facilitating guidance and precise positioning during bone cutting.

[0082] The first positioning hole 111, the second positioning hole 112 and the third positioning hole 113 on the osteotomy guide 100 correspond to the connection hole positions on the first osteotomy bone block 1, the second osteotomy bone block 2 and the mandibular retention area 4, respectively, that is, the connection hole positions on the first osteotomy bone block 1, the second osteotomy bone block 2 and the mandibular retention area 4 can be determined during the surgical planning process, and on this basis, the corresponding first positioning holes 111, the second positioning holes 112 and the third positioning holes 113 are set on the osteotomy guide 100, or after determining the approximate coverage area of ​​the osteotomy guide 100 or its preliminary guide body on the mandible, the first positioning hole 111, the second positioning hole 112 and the third positioning hole 113 can be set on the guide plate, and this operation also correspondingly defines the connection hole positions on the first osteotomy bone block 1, the second osteotomy bone block 2 and the mandibular retention area 4, so that during the operation, the osteotomy guide 100 can be fixed to the mandible by screws in conjunction with the positioning holes. In this embodiment, the number of the first positioning hole 111, the second positioning hole 112, and the third positioning hole 113 is set to 2 respectively. In actual application, the corresponding number of connection holes and positioning holes can be set according to the specific situation of the patient to ensure that the osteotomy guide can be firmly fixed to the mandible. There is no restriction here.

[0083] refer to Figure 4 As shown, the bite plate 300 comprises a U-shaped plate structure extending along the mandibular dental arch. One side of the plate is provided with a groove 310 adapted to the outer contour of the mandibular dentition crown. Thus, when the bite plate 300 is worn on the mandibular dentition, the osteotomy guide 100 connected thereto can be positioned in the desired position, i.e., in a defined relative position relative to the mandible. Like conventional guide plates, the inner side of the osteotomy guide 100 has a contour adapted to the mandibular surface it covers, allowing the osteotomy guide 100 to be snugly positioned on the mandibular surface at the desired location, and is suitable for being secured in the desired location by screws at the respective positioning holes.

[0084] The positioning guide plate 400 is used to keep the first osteotomy bone fragment 1 and the second osteotomy bone fragment 2 at the target position according to the surgical plan after they are cut. Figure 2As shown, the positioning guide plate 400 includes a fourth positioning hole 411, a fifth positioning hole 412, and a sixth positioning hole 413. The fourth positioning hole 411, the fifth positioning hole 412, and the sixth positioning hole 413 correspond to the connection holes on the first osteotomy bone fragment 1, the second osteotomy bone fragment 2, and the mandibular retention area 4, respectively. Similarly, the inner surface of the positioning guide plate 400 has a contour that adapts to the surface of each bone fragment it covers, so that the positioning guide plate 400 can fit closely to each bone fragment and be fixed with screws, thereby accurately confining the first osteotomy bone fragment 1 and the second osteotomy bone fragment 2 to the target position according to the surgical plan. At the same time, to improve the accuracy and operability of the positioning and connection between the first osteotomy fragment 1 and the second osteotomy fragment 2 and the positioning guide 400, a step 420 is provided on the side of the positioning guide 400 that contacts the fragments (the dotted line indicates the back contour), so that one side of the first osteotomy fragment 1 and the second osteotomy fragment 2 can abut against the sidewall of the step 420, thereby guiding the placement of the first osteotomy fragment 1 and the second osteotomy fragment 2. In another embodiment, another step is provided on the same side of the positioning guide 400 as the step 420, which can abut against the lower side of the mandibular retention area 4, specifically a cut surface formed by cutting the first edge 121 and the third edge 123. The above step can also be configured as a boss structure together with the step 420.

[0085] The genioplasty guide system for changing the short and flat chin of this embodiment may be applied to genioplasty surgery and may specifically include the following steps:

[0086] 1. Before the operation, low-temperature plasma disinfection should be used to disinfect and sterilize all components of the personalized chin shaping guide system.

[0087] 2. During the operation, the maxillofacial surgeon makes an incision at the anterior gingival margin of the mandible, peels off the soft tissue on the anterior bone surface of the mandible, and exposes the anterior bone surface of the mandible.

[0088] 3. Place the occlusal plate 300 of the guide plate component 10 on the patient's mandibular anterior dentition, so that the osteotomy guide plate 100 can completely fit the surface of the mandibular anterior bone.

[0089] 4. Use a bone drill to drill holes in the positioning holes of the osteotomy guide plate 100, and screw six screws into the screw holes to fix the osteotomy guide plate 100 to the surface of the anterior mandibular bone.

[0090] 5. Use a reciprocating saw to saw the bone along the corresponding edge of the osteotomy guide 100, remove the fixing screws, and the osteotomy bone block 3 defined by the first edge 121, the second edge 122, the third edge 123, and the fourth edge 124 is the bone tissue to be removed and saved for future use. Extend the saw to block the connection of the osteotomy guide 100, and cut the first osteotomy bone block 1 and the second osteotomy bone block 2, both of which are the chin bone blocks that need to be moved.

[0091] 6. Connect the first osteotomy bone block 1 and the second osteotomy bone block 2 to the positioning guide plate 400, guide the position of the first osteotomy bone block 1 and the second osteotomy bone block 2 by the step 420, align the fourth positioning hole 411 on the positioning guide plate 400 with the connecting hole on the first osteotomy bone block 1, and fix the first osteotomy bone block 1 to the positioning guide plate 400 by screws, and align the fifth positioning hole 412 on the positioning guide plate 400 with the connecting hole on the second osteotomy bone block 2, and fix the first osteotomy bone block 2 to the positioning guide plate 400 by screws, finally align the sixth positioning hole 413 on the positioning guide plate 400 with the connecting hole on the mandibular retention area 4, and fix the positioning guide plate 400 to the mandible by screws, so that the first osteotomy bone block 1 and the second osteotomy bone block 2 remain in the target position according to the surgical plan.

[0092] 7. Use titanium plates and titanium nails to connect and fix the first osteotomy bone fragment 1 and the second osteotomy bone fragment 2 to the mandible. After fixation is completed, remove the retaining screws on the positioning guide plate 400, take down the positioning guide plate 400, and depending on the size of the bone gap at the chin, trim the osteotomy bone fragment 3 and pad it in the gap to accelerate the healing of the bone wound. Finally, suture the wound to complete the operation.

[0093] Example 2

[0094] Figure 7 A flowchart showing a method for manufacturing a chin shaping guide system for changing a short and flat chin according to an embodiment of the present invention is provided, comprising the following steps:

[0095] Step 1: Obtain the preoperative digital mandibular model.

[0096] In this embodiment, the patient's mandibular dentition model is obtained. For example, an impression of the patient's lower teeth can be made and a plaster model can be cast. The plaster model can be scanned using a laser scanner to obtain the mandibular dentition model; or an intraoral scanner can be used to directly scan and obtain the patient's dentition information, and perform three-dimensional reconstruction to obtain the mandibular dentition model.

[0097] At the same time, the patient's craniomaxillofacial data is obtained. For example, the patient is asked to place the cusp position, and spiral computed tomography (spiral CT) or cone beam computed tomography (CBCT) is used to obtain craniomaxillofacial structure information and perform three-dimensional reconstruction to obtain the mandibular model. During this process, the position of the inferior alveolar nerve can be marked and the relevant data can be saved for use in verifying the guide plate.

[0098] The mandibular dentition model and the mandibular bone model are aligned using an iterative closest point algorithm, and the mandibular bone model and the mandibular dentition model are simultaneously cut on the same plane near the gingival margin of the tooth crown, retaining the crown part of the mandibular dentition model and the jaw part of the mandibular bone model, and the two are fused into a new mandibular model, namely the digital mandibular model.

[0099] The above is an optional method for obtaining the digital mandibular model. In actual applications, other existing methods can also be used to obtain the digital mandibular model, which is not limited here.

[0100] Step 2: determining an osteotomy line according to the surgical plan, wherein the osteotomy line is suitable for segmenting the first osteotomy bone block, the second osteotomy bone block, and the osteotomy removal bone block from the digital mandibular model.

[0101] In this embodiment, the position of the digital mandibular model is first adjusted so that the orbitoauricular plane is located on the XY plane and the midline of the skull base is located on the YZ plane. The positioned digital mandibular model facilitates the subsequent determination of the osteotomy line and the generation of various guide plates.

[0102] The doctor will plan the operation and determine the location of the osteotomy line based on the patient's facial shape and preoperative X-ray cephalometric analysis results. Figure 5 The surgical planning concept of osteotomy line positioning and its related operations in the design software are exemplified. It does not limit the method of determining the osteotomy line. In actual application, the osteotomy line can be determined according to the patient's specific situation and the doctor's experience and surgical habits.

[0103] 1. Establish the osteotomy planes for the chin bone block during genioplasty: When simulating osteotomy in design software (such as Proplan software), set a 3mm safety buffer zone to avoid the mental nerve canal, automatically optimize the matching degree between the curvature of the osteotomy path and the morphology of the chin base, and establish two oblique inward and upward osteotomy planes below the mental foramen on both sides of the mandible (corresponding to the cutting planes of the osteotomy line). The highest point of the intersection of the two planes should be less than 5mm below the root apex of the lower anterior teeth to ensure a safe distance.

[0104] 2. Cutting the chin bone: After cutting the mandible according to the above-mentioned osteotomy plane, a whole piece of chin bone is freed. The freed chin bone is divided into two pieces in the middle and then cut.

[0105] 3. Move the two mandibular chin bones: rotate the left chin bone counterclockwise around the lowest point below the mental foramen on that side and lower it to the final required amount of descent. Similarly, rotate the right chin bone clockwise around the lowest point below the mental foramen on that side and lower it to the final required amount of descent. At this time, there is an intersection in the middle of the two chin bones, and a wedge-shaped gap appears above. At the same time, mirror images of the left and right chin bones are made with the mid-sagittal plane (YZ plane) as the axis to determine whether the symmetry is optimal. At this time, the doctor needs to estimate the final rotation angle, descent amount and shape of the chin bone based on the actual facial shape of each patient and the results of preoperative X-ray cephalometric analysis, and further adjust the mirror image position of the two free chin bones to obtain the best simulation and surgical effect. At this point, the adjustment position of the left and right chin bones is determined. It should be noted that, depending on the actual conditions of different patients and the selected rotation center points, the two chins can be placed in an ideal position that conforms to the morphological assessment only by rotation, or only by rotation combined with translation.

[0106] 4. Removal of bone fragments: The portion of the left chin bone on the right side of the midsagittal plane is removed, and the portion of the right chin bone on the left side of the midsagittal plane is removed, thereby freeing two small bone fragments. The two small bone fragments are returned to the original position of the mandible, that is, the bone fragments to be removed during the operation, such as the osteotomy to remove bone fragment 3 in Example 1.

[0107] According to the above surgical plan, each osteotomy line can be determined on the digital mandibular model. Figure 5 The first osteotomy line 21 , the second osteotomy line 22 , the third osteotomy line 23 and the fourth osteotomy line 24 are shown. According to the osteotomy lines, the first osteotomy bone block 1 , the second osteotomy bone block 2 and the osteotomy removal bone block 3 can be segmented.

[0108] Step 3: Generate an osteotomy guide plate body according to the digital mandibular model, wherein the osteotomy guide plate body includes an edge corresponding to the osteotomy line.

[0109] In this embodiment, the surface covered by the osteotomy guide is selected on the digital mandibular model according to the position of the bone block to be cut. The range is roughly below the tooth root, within the mental foramen on both sides, and at the bottom at the lower edge of the mandible, and includes an edge corresponding to the osteotomy line, such as Figure 3 and Figure 5 The first edge 121, the second edge 122, the third edge 123, and the fourth edge 124 corresponding to the first osteotomy line 21, the second osteotomy line 22, the third osteotomy line 23, and the fourth osteotomy line 24, respectively. A predetermined thickness is extended outward based on the surface, and edge areas are set for the edges corresponding to the osteotomy lines, such as Figure 3The first edge region 131, the second edge region 132, the third edge region 133, and the fourth edge region 144 corresponding to the first edge 121, the second edge 122, the third edge 123, and the fourth edge 124, respectively, are further extended to thicken the edge region. The thickness of the thickening can be selected to be consistent or different, such as for Figure 3 The first edge region 131 and the third edge region 133 are of the same thickness, while the second edge region 132 and the fourth edge region 144 are thicker than the first edge region 131 and the third edge region 133. The selection and differentiation of thickness can be determined based on actual needs and are not limited here. The geometric body formed by the above process is the osteotomy guide body. Given that designers use different design software or have different model generation habits in actual applications, this step is intended to form the osteotomy guide body. The generation process of the osteotomy guide body is not limited here.

[0110] In this step, the present embodiment also generates an occlusal plate based on the mandibular dentition of the digitized mandibular model. Specifically, a U-shaped plate body adapted to the shape of the dental arch is generated in the front section of the mandibular dentition. The U-shaped plate body and the mandibular dentition crown are connected by Boolean operation to form a groove adapted to the outer contour of the mandibular dentition crown on one side of the U-shaped plate body, thereby generating the occlusal plate. Finally, a connecting rod is provided to connect the occlusal plate to the osteotomy guide plate body.

[0111] It should be noted that the bite plate can be generated before or after the osteotomy guide body is generated, with the aim of ultimately generating an integral structure of the bite plate and the osteotomy guide body connected by the connecting rod.

[0112] Step 4: Set a first positioning hole, a second positioning hole and a third positioning hole on the osteotomy guide body, which respectively correspond to the connection hole positions on the first osteotomy bone block, the second osteotomy bone block and the mandibular retention area.

[0113] In this embodiment, positioning holes for connecting with different bone blocks are provided on the osteotomy guide body, that is, connection holes on each bone block. The positions of the positioning holes need to avoid important anatomical positions. In addition, the shortest distance between the positioning holes and the outer periphery of the osteotomy guide body can be limited according to the shape and / or thickness of the osteotomy guide body, and a specific number of positioning holes can be provided. Figure 3 and Figure 5In the structure shown, a first positioning hole 111, a second positioning hole 112, and a third positioning hole 113 are respectively provided for the first osteotomy bone block 1, the second osteotomy bone block 2, and the mandibular retention area 4, and the number of the first positioning hole 111, the second positioning hole 112, and the third positioning hole 113 is 2.

[0114] Step 5: Obtain the mandibular target model updated after the surgical planning based on the digital mandibular model.

[0115] In the surgical planning of step 2, the osteotomy and osteotomy movement schemes have been determined, so that an updated model can be obtained after the first osteotomy bone fragment, the second osteotomy bone fragment, and the osteotomy removal bone fragment are segmented from the digital mandibular model, and the first osteotomy bone fragment and the second osteotomy bone fragment are moved to the target position, i.e., the mandibular target model.

[0116] Step 6: Generate a positioning guide body based on the mandibular target model.

[0117] In this embodiment, on the mandibular target model, the surface covered by the positioning guide is selected according to the positions of the first osteotomy bone block, the second osteotomy bone block and the mandibular retention area. The selection of its range needs to take into account the space left for fixing the titanium plates and titanium nails, so that it is as small as possible. For the disconnected portion between the first osteotomy bone block and the second osteotomy bone block and the mandibular retention area, a smooth transition of the edges of the two can be used to connect them, thereby finally determining the covering surface of the positioning guide. Based on the covering surface, a predetermined thickness is extended outward. Optionally, the disconnected area between the first osteotomy bone block and the second osteotomy bone block and the mandibular retention area is thickened, and steps are formed at the edges of the first osteotomy bone block and the second osteotomy bone block, that is, Figure 2 The step 420 in the middle, or the covering surface extends inwardly by a predetermined thickness in the area where the first osteotomy bone fragment and the second osteotomy bone fragment are disconnected from the mandibular retention area, thereby forming a boss that can be embedded in the disconnection.

[0118] In another embodiment, a first covering surface is selected in the mandibular retention area, and a second covering surface is selected in the first osteotomy bone fragment and the second osteotomy bone fragment. The first covering surface and the second covering surface are respectively extended outward by a predetermined thickness to form a first geometric body and a second geometric body, respectively. The first geometric body is then extended downward to connect with the second geometric body, thereby forming the positioning guide body.

[0119] Similarly, in view of the fact that designers use different design software or have different operating habits for model generation in actual applications, this step aims to form the positioning guide body, and the generation process of the positioning guide body is not limited here.

[0120] Step seven: setting a fourth positioning hole, a fifth positioning hole and a sixth positioning hole on the positioning guide body, corresponding to the connection holes on the first osteotomy bone block, the second osteotomy bone block and the mandibular retention area respectively.

[0121] In this step, the corresponding positioning holes on the positioning guide body are determined based on the existing connection hole positions on the first osteotomy bone block, the second osteotomy bone block and the mandibular retention area on the target mandibular model, that is, the fourth positioning hole, the fifth positioning hole and the sixth positioning hole correspond to the connection hole positions on the first osteotomy bone block, the second osteotomy bone block and the mandibular retention area respectively.

[0122] At this point, a digital model of the guide plate component 10 and the positioning guide plate 400 as in the first embodiment can be obtained, which can be materialized through existing forming technology, such as using DLP light-curing 3D printing technology and using biocompatible resin materials to make the physical object of the above digital model.

[0123] The genioplasty guide system and its manufacturing method for modifying a short, flat chin, presented in this invention, provides a novel surgical osteotomy method for effectively improving the aesthetic appearance of the chin for patients with short, wide, and flat chin deformities. Compared to previously standardized genioplasty guides, this system offers a new, personalized genioplasty guide system with a novel design, new functionality, and new functionality. By converting the osteotomy guide into a positioning guide and accurately replicating the surgical plan through nail trajectories, this system addresses the previously unattainable genioplasty procedure for such patients, accelerating the overall surgical time and maximizing postoperative symmetry and aesthetics. The main mechanism is to design and calculate the movement mode of the chin bone fragment and whether the size of the bone fragment after osteotomy meets the standards of bone healing and growth, so as to avoid nonunion caused by absorption of small bone fragments or severe lack of blood supply due to a large amount of meaningless osteotomy, so as to achieve safe implementation and maintain the lowest damage state during the operation. On this basis, a new chin shaping guide system is used during the operation to perform osteotomy methods and bone removal range size and shape that are different from previous conventional chin shaping surgeries, so as to achieve the best surgical effect of improving the chin bottom morphology after the bone fragment is moved.

[0124] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A chin shaping guide plate system for changing the short and flat chin shape, characterized in that: include: an osteotomy guide plate, the osteotomy guide plate including a first positioning hole, a second positioning hole, and a third positioning hole, and defining a cutting guide path for the first osteotomy bone fragment, the second osteotomy bone fragment, and the osteotomy removal bone fragment, the first positioning hole, the second positioning hole, and the third positioning hole corresponding to the connection hole positions on the first osteotomy bone fragment, the second osteotomy bone fragment, and the mandibular retention area, respectively; A positioning guide plate is used to limit the first and second osteotomy bone fragments to the target positions according to the surgical plan; the positioning guide plate includes a fourth positioning hole, a fifth positioning hole and a sixth positioning hole, and the fourth positioning hole, the fifth positioning hole and the sixth positioning hole respectively correspond to the connection hole positions on the first osteotomy bone fragment, the second osteotomy bone fragment and the mandibular retention area.

2. The genioplasty guide system according to claim 1, wherein: It also includes a bite plate connected to the osteotomy guide plate.

3. The genioplasty guide system according to claim 1, wherein: The osteotomy guide includes a first edge, a second edge, a third edge, and a fourth edge. The first edge and the second edge define a cutting guide path for the first osteotomy bone fragment, and the third edge and the fourth edge define a cutting guide path for the second osteotomy bone fragment.

4. The genioplasty guide system according to claim 3, wherein: The osteotomy bone removal block is located between the first osteotomy bone block and the second osteotomy bone block, and the first edge, the second edge, the third edge and the fourth edge jointly define a cutting guide path of the osteotomy bone removal block.

5. The genioplasty guide system according to claim 1, wherein: The first osteotomy bone fragment and the second osteotomy bone fragment respectively reach their target positions by relative rotation, or relative rotation combined with translation, or relative rotation combined with translation and downward movement, with corresponding preset reference points as centers, from their initial positions.

6. The genioplasty guide system according to claim 3, wherein: The edge areas where the first edge, the second edge, the third edge and the fourth edge are located are respectively thickened.

7. The genioplasty guide system according to claim 1, wherein: Limiting slots are provided on the extension paths of the first edge and the third edge.

8. The genioplasty guide system according to claim 1, wherein: There are at least two of the first positioning holes, the second positioning holes, and the third positioning holes.

9. A method for manufacturing a chin shaping guide plate system for changing a short and flat chin, characterized in that: include: Obtain a preoperative digital mandibular model; Determining an osteotomy line according to the surgical plan, wherein the osteotomy line is suitable for segmenting a first osteotomy bone block, a second osteotomy bone block, and an osteotomy removal bone block from the digital mandibular model; generating an osteotomy guide plate body according to the digital mandibular model, wherein the osteotomy guide plate body includes an edge corresponding to the osteotomy line; A first positioning hole, a second positioning hole and a third positioning hole are provided on the osteotomy guide plate body, which correspond to the connection holes on the first osteotomy bone block, the second osteotomy bone block and the mandibular retention area respectively; Acquiring a mandibular target model updated after surgical planning based on the digital mandibular model; generating a positioning guide body according to the mandibular target model; A fourth positioning hole, a fifth positioning hole and a sixth positioning hole are provided on the positioning guide plate body, which correspond to the connection hole positions on the first osteotomy bone block, the second osteotomy bone block and the mandibular retention area respectively.

10. The production method according to claim 9, characterized in that: Also includes: generating a bite plate according to the digital mandibular model; The bite plate is connected to the osteotomy guide body.

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