doi: /j.issn

Transcription

1 Chinese Journal of Tissue Engineering Research October 8, 2015 Vol.19, No.42 ( ) 1 MIMICS ANSYS 2 3 MIMICS ANSYS 4 (BSSRO) MIMICS ANSYS (2013KR11) CT DICOM MIMICS ANSYS ANSYS MIMICS ANSYS :R318 : A : (2015) [J] (42): doi: /j.issn Establishing a finite element model of the mandible containing the temporomandibular joint after bilateral-sagitta-split-ramus-osteotomy with internal fixation Ma Wen, Hou Min, Song Da-li, Yang Jing-wen, Dai Zhi, Cheng Jia-long, Chai Guo-liang, Zhou Wei-yuan, Zhang Rui-ze ( Tianjin Medical University, Tianjin , China; Tianjin Stomatological Hospital, Tianjin , China; Jixian County People s Hospital, Tianjin , China; Tianjin University, Tianjin , China; Sichuan Province Forestry Center Hospital, Chengdu , Sichuan Province, China) Abstract BACKGROUND: Bilateral-sagitta-split-ramus-osteotomy (BSSRO) has become a conventional method to correct facial deformities, and the finite element method is a significant way to study biomechanics of the mandible and temporomandibular joint (TMJ) after BSSRO. OBJECTIVE: To establish a precise and high simulation model of mandible containing TMJ after BSSRO with internal fixation, which is the base to study the biomechanics of the mandible and TMJ after BSSRO. METHODS: Spiral CT scan was used to get the data of DICOM that were input into MIMICS to establish the three-dimensional model of the mandible. The three-dimensional model was wrapped into a single closed shell for mesh generation and conversion in ANSYS. Then, the model was input into the ANSYS software for temporomandibular joint reconstruction and simulation of BSSRO and internal fixation. RESULTS AND CONCLUSION: The three-dimensional finite element model of mandible containing TMJ after Ma Wen, Studying for master s degree, Tianjin Medical University, Tianjin , China Corresponding author: Hou Min, M.D., Master s supervisor, Tianjin Stomatological Hospital, Tianjin , China Accepted: P.O. Box 10002, Shenyang

2 . BSSRO was established using MIMICS and ANSYS. This model had biological similarity and geometric similarity in comparison with the human tissues. The model could undergo various internal fixations through antedisplacement, retroposition and rotational movement of the distal end. Based on different experimental purposes, the established model can apply a load to all parts to study changes in stress and displacement of different tissues after BSSRO and internal fixation, and it also can be used to study the effect of different fixation materials on the rear stability after internal fixation. Subject headings: Mandible; Temporomandibular Joint; Osteotomy; Finite Element Analysis; Tissue Engineering Funding: the Project of Tianjin Health Department, No. 2013KR11 Ma W, Hou M, Song DL Yang JW, Dai Z, Cheng JL, Chai GL, Zhou WY, Zhang RZ. Establishing a finite element model of the mandible containing the temporomandibular joint after bilateral-sagitta-split-ramus-osteotomy with internal fixation. Zhongguo Zuzhi Gongcheng Yanjiu. 2015;19(42): Introduction Trauner [1] 1957 (bilateral sagittal split ramus osteotomy BSSRO) [2-5] [6] [7] CT DICOM CTDICOMMIMICS ANSYS 1Materials and methods CT 1 GECT(120 kv 300 ma FOV 15.6 cm Slice Thickness mm) MIMICS 15.0(Materialises Interactive Medical Image Control System Belgium) ANSYS 15.0(Analysis system USA) CTDICOM MIMICS(segmentation) (thresholding) (Mask) (region growing)(mask) (cavity fill) 3D (calculate 3D) 1Max:2900 Min Tools (smoothing) (triangle reduction) (wrap) MIMICS Remesh.lisANSYS ANSYSANSYS MIMICS FEAMaterialCT ρ=1.205 HU+139 E=0.024 ρ-23.93(mpa) ρhu ANSYS ANSYS Preprocessor>Modeling>Create> Lines>Splines>Splines Thru KPs Create>Areas>Arbitrary>By Skinning [8]0.2 mm ISSN CN /R CODEN: ZLKHAH 6731

3 . A B A B 1 Figure 1 Three-dimensional model of the mandible A B 3 Figure 3 Three-dimensional finite element model of the mandible containing the temporomandibular joint A B A B C D 2 Figure 2 The mesh model A B ANSYS C D MIMICS A B C D 4 Figure 4 Three-dimensional model of the mandible after bilateral-sagitta-split-ramus-osteotomy A B ANSYS C D MIMICS A B 5 Figure 5 Three-dimensional finite element model of the mandible containing the temporomandibular joint after bilateral-sagitta-splitramus-osteotomy with internal fixation A B 2 mm [9] Preprocessor>Modeling>Copy> Areas> Modeling>Create>Areas>Rectangle>By Dimensions [10] Preprocessor>Modeling> Create>Contact Pair>Contact Wizard MIMICS ANSYSMIMICS 6732 P.O. Box 10002, Shenyang

4 . Simulation ANSYS MIMICS Preprocessor> Modeling>Create>Areas>Rectangle>By Dimensions 3 Modeling>Move/ Modify>Volumes ANSYS Preprocessor>Modeling>Create>Areas>Circle>Solid Results MIMICS ANSYS Discussion (FEM) 1973 Farah [11] [12] [13-14] 1/3 [15] CT DICOM Tanaka [16] [17] CT CT DICOMCT DICOM MimicsCT MRI Geomagic ANSYS ABAQUS CT [18] [19] MIMICS(Materialise s Interactive Medical Image Control System) Materialise MIMICSCT MRI micro-ct CBCT 3D MIMICS ANSYSANSYS (FEA) AutoCAD Nastran Geomagic CT DICOM MIMICS ISSN CN /R CODEN: ZLKHAH 6733

5 . MIMICS ANSYS ANSYS MIMICS MIMICS ANSYS MIMICS ANSYS MIMICSDICON ANSYS 1973 Farah CT Dicom Mimics Ansys mm CT Dicom Mimics Ansys CT Dicom Mimics ( ) 4 References [1] Trauner R, Obwegeser H. The surgical correction of mandibular prognathism and retrognathia with consideration of genioplasty. II. Operating methods for microgenia and distoclusion. Oral Surg Oral Med Oral Pathol.1957;10(9): [2] dal Pont G. Retromolar osteotomy for the correction of prognathism. J Oral SurgAnesthHosp Dent Serv. 1961;19: [3] Hunsuck EE. A modified intraoral sagittal splitting technic for correction of mandibular prognathism. J Oral Surg. 1968; 26(4): [4] Epker BN.Modifications in the sagittal osteotomy of the mandible. J Oral Surg.1977;35(2): [5] Wolford LM, Davis WJ.The mandibular inferior border split: a modification in the sagittal split osteotomy.j Oral Maxillofac Surg.1990; 48(1): [6] Ueki K, Marukawa K, Moroi A, et al.evaluation of overlapped cortical bone area after modified plate fixation with bent plate in sagittal split ramus osteotomy.j Craniomaxillofac Surg. 2014; 42(5): e210-e216. [7] Franco JE, Van Sickels JE, Thrash WJ.Factors contributing to relapse in rigidly fixed mandibular setbacks.j Oral Maxillofac Surg.1989; 47(5): [8] Pullinger AG, Baldioceda F, Bibb CA.Relationship of TMJ articular soft tissue to underlying bone in young adult condyles. J Dent Res.1990; 69(8): [9] Hansson T, Oberg T, Carlsson GE, etal.thickness of the soft tissue layers and the articular disk in the temporomandibular joint. ActaOdontol Scand.1977;35(2): [10] Tanaka E, del Pozo R, Tanaka M, et al.three-dimensional finite element analysis of human temporomandibular joint with and without disc displacement during jaw opening. Med Eng Phys.2004; 26(6): [11] Farah JW, Craig RG, Sikarskie DL.Photoelastic and finite element stress analysis of a restored axisymmetric first molar. J Biomech.1973;6(5): [12] Cheng HY, Peng PW, Lin YJ, et al.stress analysis during jaw movement based on vivo computed tomography images from patients with temporomandibular disorders. Int J Oral Maxillofac Surg.2013;42(3): [13] Morra EA, Greenwald AS. Polymer insert stress in total knee designs during high-flexion activities: a finite element study. J Bone Joint Surg Am.2005; 87 Suppl 2: [14] Majumder S, Roychowdhury A, Pal S. Effects of trochanteric soft tissue thickness and hip impact velocity on hip fracture in sideways fall through 3D finite element simulations. J Biomech.2008; 41(13): [15] Joss CU, Vassalli IM.Stability after bilateral sagittal split osteotomy setback surgery with rigid internal fixation: a systematic review. J Oral Maxillofac Surg. 2008; 66(8): [16] Tanaka E, Tanne K, Sakuda M. A three-dimensional finite element model of the mandible including the TMJ and its application to stress analysis in the TMJ during clenching. Med Eng Phys.1994; 16(4): [17],,,. [J]., 1999,15(4): [18],,,.4 [J]., (2): [19],. [J]. :, 2012,28(6): P.O. Box 10002, Shenyang