CN113317860A - Prosthesis fixing structure for mandible restoration and three-dimensional model design method - Google Patents
Prosthesis fixing structure for mandible restoration and three-dimensional model design method Download PDFInfo
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- CN113317860A CN113317860A CN202110701106.4A CN202110701106A CN113317860A CN 113317860 A CN113317860 A CN 113317860A CN 202110701106 A CN202110701106 A CN 202110701106A CN 113317860 A CN113317860 A CN 113317860A
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- 210000004373 mandible Anatomy 0.000 title claims abstract description 79
- 238000013461 design Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000008439 repair process Effects 0.000 claims abstract description 18
- 239000011159 matrix material Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 4
- 210000000214 mouth Anatomy 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 210000000988 bone and bone Anatomy 0.000 abstract description 14
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract description 9
- 229910052719 titanium Inorganic materials 0.000 abstract description 9
- 239000010936 titanium Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 230000001815 facial effect Effects 0.000 abstract description 4
- 238000002513 implantation Methods 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 3
- 210000004872 soft tissue Anatomy 0.000 description 3
- 230000001055 chewing effect Effects 0.000 description 2
- 230000009194 climbing Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 210000003484 anatomy Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012620 biological material Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002591 computed tomography Methods 0.000 description 1
- 238000007408 cone-beam computed tomography Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 210000002698 mandibular nerve Anatomy 0.000 description 1
- 230000035790 physiological processes and functions Effects 0.000 description 1
- 238000002271 resection Methods 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8061—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates specially adapted for particular bones
- A61B17/8071—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates specially adapted for particular bones for the jaw
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8004—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with means for distracting or compressing the bone or bones
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Neurology (AREA)
- Medical Informatics (AREA)
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- Veterinary Medicine (AREA)
- Prostheses (AREA)
Abstract
The invention relates to the technical field of mandible defect repair, and discloses a prosthesis fixing structure for mandible repair and a three-dimensional model design method. The prosthesis fixing structure for mandible restoration comprises a first fixing piece and a second fixing piece; the first fixing piece comprises two connecting parts, the connecting parts are positioned at two ends of the first fixing piece, and the connecting parts are provided with screw mounting holes which are arranged in a run-through manner; the second fixing piece is of a porous structure, is arranged between the connecting portion and the surface of the mandible and is integrally formed with the first fixing piece, and is provided with avoiding holes which correspond to the screw mounting holes one to one and are coaxial. According to the invention, the second fixing piece with the porous structure is arranged between the connecting part of the first fixing piece and the mandible, so that the elastic modulus difference between the prosthesis fixing structure and the mandible is reduced, the growth of the mandible joint face bone is facilitated, the problem that the titanium plate is loosened and displaced at the initial stage of prosthesis implantation to cause operation failure due to the direct joint and fixation of the titanium plate and the outer surface of the mandible is solved, and the effect of improving the facial features of a patient is achieved.
Description
Technical Field
The invention relates to the technical field of mandible defect repair, in particular to a prosthesis fixing structure for mandible repair and a three-dimensional model design method.
Background
The human mandible as the facial 1/3 bony scaffold is the main supporting structure of the face and the only movable bone of the face, and is the key to the functions of maintaining the face shape, keeping chewing and the like. Currently, mandibular defects are common in craniomaxillofacial defects. Clinical mandibular bone defects can have a large impact on functional actions such as chewing, facial appearance, etc., and reconstructing the physiological function and anatomic shape of the defective mandible is a challenging subject in the art.
The prosthesis fixing structure for mandible restoration is a structure which can help a patient to restore the appearance and the shape and restore the occlusion function after the mandible is damaged and connects two host physiological bones. The mandible is functionally reconstructed by applying a modern medical science means, and the prosthesis fixing structure for mandible repair and the rest bone tissues have good biomechanical compatibility while the accurate restoration of the appearance is considered, so that the stress shielding phenomenon caused by the overlarge elastic modulus difference between the prosthesis fixing structure and the rest bone tissues is avoided. In the prior art, a prosthesis is mainly made of autogenous bone or biological materials to fill the defect part of the mandible, and then the prosthesis is fixed by a titanium plate.
When the prosthesis is fixed by the titanium plate, the titanium plate is directly attached to the outer surface of the residual bone of the mandible and is fixed by screws, and the titanium plate has larger elastic modulus difference with the bone tissue of a human body, so that the situation that the titanium plate is loosened, displaced, fallen off or broken easily occurs in the initial stage of implantation of the prosthesis by the fixing mode, and the operation failure is caused.
Disclosure of Invention
The invention aims to provide a prosthesis fixing structure for mandible restoration and a three-dimensional model design method, which can improve the stability of the prosthesis at the initial stage of implantation and improve the success rate of operation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a prosthesis fixing structure for mandible restoration, comprising:
the first fixing piece is of a solid structure and comprises two connecting parts, and the connecting parts are positioned at two ends of the first fixing piece;
the connecting part is provided with a screw mounting hole which is arranged in a penetrating way, the central axis of the screw mounting hole is vertical to the outer surface of the connecting part, and a screw penetrates through the screw mounting hole to fix the first fixing piece and the mandible;
the second fixing piece is of a porous structure;
the second fixing piece is arranged between the connecting part and the surface of the mandible and is integrally formed with the first fixing piece;
preferably, the connecting portion is provided with a plurality of screw mounting holes, and the number of the screw mounting holes on the two connecting portions is the same.
Preferably, the distance between two adjacent screw mounting holes on the connecting part is 6mm-13 mm.
Preferably, the connecting portion are provided with mounting bosses, the mounting bosses correspond to the screw mounting holes one by one, the screw mounting holes penetrate through the mounting bosses correspondingly, and the mounting bosses penetrate through the corresponding avoiding holes.
Preferably, the length of the mounting boss in the axial direction of the screw mounting hole is not greater than the thickness of the first fixing member.
Preferably, the upper edge and the lower edge of the first fixing piece are provided with inward turned edge covers for coating the edges of the first fixing piece and the prosthesis.
Preferably, the second fixing member includes a plurality of connected grid cells, and the plurality of grid cells are distributed in a linear matrix.
Preferably, the aperture of the grid unit is 0.8mm-1.1mm, and the wire diameter of the grid unit is 0.5mm-0.7 mm.
Preferably, the length of the second fixing member in the axial direction of the screw mounting hole is not greater than the thickness of the first fixing member.
The invention also provides a three-dimensional model design method of the prosthesis fixing structure for mandible restoration, which comprises the following steps:
1) collecting data of the oral cavity of the patient, and reconstructing a three-dimensional model of the mandible according to the collected data;
2) cutting off the skeleton of a focus area on the mandible three-dimensional model, and symmetrically arranging the skeleton of the healthy side to the affected side through mirror image to fill the focus area;
3) extracting a covering surface on the mandible three-dimensional model, and forming a three-dimensional model of the first fixing piece according to the extracted covering surface;
4) determining the position of a screw mounting hole on the three-dimensional model of the first fixing piece;
5) carrying out parameterized grid design on the inner surfaces at two ends of the three-dimensional model of the first fixing piece to enable grid units to be distributed in a linear matrix manner so as to obtain the three-dimensional model of the second fixing piece;
6) and performing Boolean combination on the three-dimensional model of the first fixing piece and the three-dimensional model of the second fixing piece to obtain a three-dimensional model of the prosthesis fixing structure for mandible restoration.
The invention has the beneficial effects that: according to the invention, the second fixing piece with the porous structure is arranged between the first fixing piece connecting part and the mandible, so that the elastic modulus difference between the prosthesis fixing structure for mandible repair and the mandible is reduced, and the phenomenon of stress shielding after the prosthesis is fixed by directly adopting a titanium plate is favorably avoided; and soft tissues can be attached to the first fixing piece in a climbing mode, so that the lower jaw joint face bone can grow in, the fixing effect of the prosthesis is improved, and the facial features of a patient are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic structural view of a prosthesis fixing structure for mandibular joint repair according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a prosthesis fixing structure for mandibular joint repair provided by an embodiment of the present invention without showing screw mounting holes;
fig. 3 is a flowchart of a method for designing a three-dimensional model of a prosthesis fixed structure for mandible repair according to an embodiment of the present invention.
In the figure:
1. a first fixing member; 11. a screw mounting hole; 12. mounting a boss;
2. and a second fixing member.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
Fig. 1 is a schematic structural view of a prosthesis fixing structure for mandible repair according to the present embodiment, and fig. 2 is a schematic structural view of a prosthesis fixing structure for mandible repair provided in the present embodiment without showing screw mounting holes. As shown in fig. 1 and 2, the present embodiment provides a prosthesis fixing structure for repairing a mandible, which can improve the stability of a prosthesis at an initial stage of implantation and improve the success rate of surgery.
The prosthesis fixing structure for repairing the mandible comprises a first fixing piece 1 and a second fixing piece 2; the first fixing piece 1 is of a solid structure and comprises two connecting parts, and the connecting parts are positioned at two ends of the first fixing piece;
the connecting part is provided with a screw mounting hole 11 which is arranged in a run-through manner, the central axis of the screw mounting hole 11 is vertical to the outer surface of the connecting part, and a screw runs through the screw mounting hole 11 to fix the first fixing piece 1 and the mandible;
the second fixing member 2 is of a porous structure, is arranged between the connecting part and the surface of the mandible, and is integrally formed with the first fixing member 1.
In the case of mandible repair, the bone in the focal area is usually trimmed, after which the prosthesis is filled and fixed using a prosthesis fixing structure. In the embodiment, the second fixing piece 2 with a porous structure is arranged between the connecting part of the first fixing piece 1 and the surface of the mandible, so that the elastic modulus difference between the prosthesis fixing structure for repairing the mandible and the mandible is reduced, and the phenomenon of stress shielding after the prosthesis is fixed by directly adopting a titanium plate is favorably avoided; and soft tissues can be attached to the second fixing piece 2 in a climbing manner, so that the fixing effect of the prosthesis is improved.
The second fixing member 2 includes a plurality of connected grid cells, and the plurality of grid cells are distributed in a linear matrix.
In order to better connect the first fixing member 1 and the mandible, a plurality of screw mounting holes 11 are provided on the connecting portion.
The number of the screw mounting holes 11 provided for the two connection portions is the same in consideration of the structural characteristics and biomechanics of the human body.
In order to obtain a better fixing effect, the distance between the adjacent screw mounting holes 11 of each connecting part is set to be 6mm-13 mm.
This embodiment is provided with installation boss 12 on the connecting portion of first mounting 1, installation boss 12 and 11 one-to-one of screw mounting hole, and screw mounting hole 11 runs through connecting portion and the installation boss 12 that corresponds, and installation boss 12 passes the hole of dodging that corresponds, and installation boss 12 can increase the area of contact of screw and first mounting 1, improves the stability of first mounting 1.
In order to better fix the prosthesis, the upper edge and the lower edge of the first fixing piece 1 are provided with inward-turned covering edges, the upper edge and the lower edge of the prosthesis are covered in the covering edges, and meanwhile, the covering edges can also cover the upper edge and the lower edge of the second fixing piece 2, so that the stability of the second fixing piece 2 is improved.
Further, the length of the second fixing piece 2 along the axial direction of the screw mounting hole 11 is not more than the thickness of the first fixing piece 1, so that the prosthesis fixing structure for repairing the mandible can be guaranteed to meet the anatomical form.
Fig. 3 is a flowchart of a method for designing a three-dimensional model of a prosthesis fixed structure for mandible repair according to an embodiment of the present invention. As shown in fig. 3, the present embodiment further provides a method for designing a three-dimensional model of a prosthesis fixing structure for mandible reconstruction, comprising the following steps:
1) and acquiring data of the oral cavity part of the patient, and reconstructing a mandible three-dimensional model according to the acquired data.
Preferably, the embodiment of the present invention is as follows: CT image data acquisition of a patient, namely acquiring data of the mandible of the patient by using CT scanning equipment, such as conventional spiral CT or oral CBCT, and storing the scanned mandible CT data into special storage equipment in a DICOM format;
establishing a three-dimensional model of the mandible: the DICOM-format mandible CT data is imported into medical image processing software for data processing, such as Mimics software, the software is used for carrying out three-dimensional solid model reconstruction on the mandible of a patient, and grid smoothing processing is carried out on a local area, so that an STL-format file is obtained.
2) And cutting off the bone of the focus area on the three-dimensional model of the mandible, and symmetrically arranging the bone of the healthy side to the affected side through mirror image to fill the focus area.
Preferably, the embodiment of the present invention is as follows: determining a mandible focus area according to the diagnosis of a clinician, and designing an osteotomy resection scheme by utilizing a medical image processing software Mimics software or magics software. Simulating and cutting the skeleton in the focus area by using a design tool in medical image processing software to obtain a mandible defect model;
and secondly, according to the defect size and position of the mandible defect model, the healthy side bones are symmetrically arranged on the affected side through mirror images to fill the focus area, so that the complete mandible repairing model is obtained.
In other embodiments, the prosthesis can also be designed in a curved surface reconstruction mode and used for filling a focus area.
3) A covering surface is extracted on the three-dimensional model of the mandible, and a three-dimensional model of the first fixing member 1 is formed according to the extracted covering surface.
Extracting a covering surface of the first fixing piece 1 by using medical image processing software such as Geomagic, designing and generating a thin plate structure with a certain thickness, performing smooth transition processing on the edge part of the thin plate structure, and performing meshing by using finite element mesh processing software to obtain a mesh model of the first fixing piece 1; importing the grid model of the first fixing piece 1 into finite element simulation software, setting an optimization condition and an optimization target, and setting the optimization target to minimize strain energy, namely maximize rigidity to obtain the shape structure of the first fixing piece 1; and exporting the shape structure of the first fixing piece 1 to grid processing software for correction to obtain a three-dimensional model of the first fixing piece 1.
4) And determining the position of the screw mounting hole 11 on the three-dimensional model of the first fixing member 1.
According to the physiological anatomy characteristics of the mandible, sensitive parts such as tooth roots, mandibular nerve canals and the like are avoided, and the position of the screw mounting hole 11 with better biomechanical characteristics is designed and determined.
5) And carrying out parameterized grid design on the inner surfaces at two ends of the three-dimensional model of the first fixing piece 1 to ensure that grid units are distributed in a linear matrix manner so as to obtain the three-dimensional model of the second fixing piece 2.
Constructing a grid model based on a porous structure distributed in a linear matrix on the inner surfaces of two ends of a three-dimensional model of a first fixing part 1, introducing the grid model of the porous structure into finite element simulation software, setting an optimization condition and an optimization target, and setting the optimization target to be strain energy minimization, namely rigidity maximization, so as to obtain an optimized shape structure of the porous structure; exporting the optimized shape structure of the porous structure into grid processing software for finishing to obtain an optimized model of the porous structure; in order to avoid the occurrence of the stress shielding phenomenon and consider the attachment growth of soft tissues, the wire diameter and the aperture of the grid unit are reasonably set to obtain a three-dimensional model of the second fixing piece 2, and the aperture of the grid unit is preferably 0.8mm-1.1mm, and the wire diameter of the grid unit is preferably 0.5mm-0.7 mm.
6) And performing Boolean combination on the three-dimensional model of the first fixing piece 1 and the three-dimensional model of the second fixing piece 2, and performing smooth transition treatment on the structural model obtained by Boolean combination to obtain the three-dimensional model of the prosthesis fixing structure for mandible restoration.
As to how boolean combinations are performed, they are not described in detail here for the prior art.
In practical application, the prosthesis fixing structure for repairing the mandible is obtained by performing 3D printing according to the three-dimensional model of the prosthesis fixing structure for repairing the mandible.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (10)
1. A prosthesis fixing structure for mandible restoration, characterized by comprising:
the fixing structure comprises a first fixing piece (1), wherein the first fixing piece (1) is of a solid structure, the first fixing piece (1) comprises two connecting parts, and the connecting parts are positioned at two ends of the first fixing piece (1);
the connecting part is provided with a screw mounting hole (11) which is arranged in a penetrating way, the central axis of the screw mounting hole (11) is vertical to the outer surface of the connecting part, and a screw penetrates through the screw mounting hole (11) to fix the first fixing piece (1) and the mandible;
the second fixing piece (2), the second fixing piece (2) is of a porous structure;
the second fixing piece (2) is arranged between the connecting part and the surface of the mandible and is integrally formed with the first fixing piece (1);
and a avoiding hole coaxial with the screw mounting hole (11) is formed in the second fixing piece (2).
2. The prosthesis fixing structure for mandible repair according to claim 1, wherein said connecting part is provided with a plurality of said screw mounting holes (11), and the number of said screw mounting holes (11) of both said connecting parts is the same.
3. The prosthesis fixing structure for mandible repair according to claim 2, wherein a distance between adjacent two of said screw mounting holes (11) located at said connecting part is 6mm to 13 mm.
4. The prosthesis fixing structure for mandible repair according to claim 1, wherein said connecting portion is provided with mounting bosses (12), said mounting bosses (12) correspond to said screw mounting holes (11) one to one, said screw mounting holes (11) penetrate through said corresponding mounting bosses (12), and said mounting bosses (12) penetrate through said corresponding avoiding holes.
5. The prosthesis fixing structure for mandible repair according to claim 4, wherein a length of said mounting boss (12) in an axial direction of said screw mounting hole (11) is not more than a thickness of said first fixing member (1).
6. The prosthesis fixing structure for repairing a mandible according to claim 1, wherein the upper and lower edges of said first fixing member (1) are provided with turned-in rims for covering the edges of said second fixing member (2) and the prosthesis.
7. The prosthesis fixation structure for mandible reconstruction according to claim 1, characterized in that said second fixation member (2) comprises a plurality of connected grid cells, a plurality of said grid cells being arranged in a linear matrix.
8. The prosthesis fixing structure for mandible restoration according to claim 7, wherein the mesh unit has a hole diameter of 0.8mm to 1.1mm, and the mesh unit has a wire diameter of 0.5mm to 0.7 mm.
9. The prosthesis fixing structure for mandible repair according to claim 1, wherein a length of said second fixing member (2) in an axial direction of said screw mounting hole (11) is not more than a thickness of said first fixing member (1).
10. A design method of a prosthesis fixing structure for mandible restoration is characterized by comprising the following steps:
1) collecting data of the oral cavity of the patient, and reconstructing a three-dimensional model of the mandible according to the collected data;
2) cutting off the skeleton of a focus area on the mandible three-dimensional model, and symmetrically arranging the skeleton of the healthy side to the affected side through mirror image to fill the focus area;
3) extracting a covering surface on the mandible three-dimensional model, and forming a three-dimensional model of the first fixing piece (1) according to the extracted covering surface;
4) determining the position of a screw mounting hole (11) on the three-dimensional model of the first fixing piece (1);
5) carrying out parameterized grid design on the inner surfaces at two ends of the three-dimensional model of the first fixing piece (1) to enable grid units to be distributed in a linear matrix manner so as to obtain the three-dimensional model of the second fixing piece (2);
6) and performing Boolean combination on the three-dimensional model of the first fixing piece (1) and the three-dimensional model of the second fixing piece (2) to obtain a three-dimensional model of the prosthesis fixing structure for mandible restoration.
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| CN202110701106.4A CN113317860B (en) | 2021-06-22 | 2021-06-22 | Prosthesis fixing structure for mandible restoration and three-dimensional model design method |
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| CN202110701106.4A CN113317860B (en) | 2021-06-22 | 2021-06-22 | Prosthesis fixing structure for mandible restoration and three-dimensional model design method |
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| CN113317860B (en) | 2023-03-14 |
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