Chinese Journal of Tissue Engineering Research December 28, 2017 Vol.21, No.36 ISSN CN /R CODEN: ZLKHAH 5763

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1 Chinese Journal of Tissue Engineering Research December 28, 2017 Vol.21, No.36 1 ( ). [J] (36): DOI: /j.issn ORCID: X() Mimics CT MRI ANSYS :R318 :A : (2017) CT MRI 3 ()( C084) Three-dimensional finite element analysis of the stress distribution on the temporomandibular joint after single maxillary extraction orthodontics in adult patients with Class II division 1 malocclusion Lv Ru-ya, Studying for master s degree, Department of Stomatology, the Second Affiliated Hospital of Xinjiang Medical University, Urumqi , Xinjiang Uygur Autonomous Region, China Corresponding author: Liu Hai-xia, M.D., Chief physician, Department of Stomatology, the Second Affiliated Hospital of Xinjiang Medical University, Urumqi , Xinjiang Uygur Autonomous Region, China ISSN CN /R CODEN: ZLKHAH 5763

2 . Lv Ru-ya, Yin Yan-jiao, Liu Hai-xia, Chen Qiu-qiu, Wang Jing (Department of Stomatology, the Second Affiliated Hospital of Xinjiang Medical University, Urumqi , Xinjiang Uygur Autonomous Region, China) Abstract BACKGROUND: Clinical evaluation gives much attention to occlusion and improvement of soft tissue profile, while little is reported concerning the stress distribution on the temporomandibular joint in the treatment of Class II division 1 malocclusion adult patients undergoing single maxillary extraction orthodontics. OBJECTIVE: To analyze the stress distribution on the temporomandibular joint in the treatment of Class II division 1 malocclusion with single maxillary extraction orthodontics. METHODS: The three-dimensional finite element models of normal and Class II division 1 malocclusion before and after single maxillary extraction orthodontics according to CT and MRI data. The stress distribution on the temporomandibular joint was analyzed after mechanical loading and boundary constraint. RESULTS AND CONCLUSION: Compared with Class II division 1 malocclusion, the stress distribution on the temporomandibular joint after single maxillary extraction orthodontics had no significant stress concentration area, and the equivalent stress of the condyle was lower than that before treatment, and the equivalent stress of the articular disc and the glenoid fossa of temporal bone were larger than those before treatment. However, the stress was well-distributed, basically fulfilling the stress characteristics of normal occlusion. To conclude, single maxillary extraction orthodontics reduces the risk of temporomandibular joint disorder in the patients with Class II division 1 malocclusion, which is balanced and stable in line with the goal of orthodontic treatment. Subject headings: Temporomandibular Joint; Finite Element Analysis; Tissue Engineering Funding: the Natural Science Foundation of Xinjiang Uygur Autonomous Region, No C084 Cite this article: Lv RY, Yin YJ, Liu HX, Chen QQ, Wang J. Three-dimensional finite element analysis of the stress distribution on the temporomandibular joint after single maxillary extraction orthodontics in adult patients with Class II division 1 malocclusion. Zhongguo Zuzhi Gongcheng Yanjiu. 2017;21(36): Introduction 1(Class II division 1) (20.05%27.7%) 38.6% [1] [2-3] [4-6] 1Subjects and methods mm 64CT(Philips) CT1.25 mm 0.30 mm751signa1.5tmri(ge Milwaukee) 1.5 mm205 Mimics(Materialize softwareleuven )Import ImageCTMRI DICOMMimicsX()Y ()Z()CTMRI mask Edit MasksDraw Calcuate 3DCT MRI *.stl Geomagic Studio 10.0(Raindrop GeoMagic,) NURBSNURBS 5764 P.O. Box 10002, Shenyang

. 1 Figure 1 Geometrical model of the temporomandibular joint A B C 2

joint A B C 3 Figure 3 Equivalent stress of the mandible A B C 4 Figure 4

articular disc A B C 6 Figure 6 Eequivalent stress of the glenoid fossa of

2 1 Unig-raphicsNX 8.5 (Siemens) 6 mm8 mm 1 1 1.4.3 1 1 Unig- raphicsnx8.

3 . 1 Figure 1 Geometrical model of the temporomandibular joint A B C 2 Figure 2 Three-dimensional finite element model of the temporomandibular joint A B C 3 Figure 3 Equivalent stress of the mandible A B C 4 Figure 4 Equivalent stress of the condyle A B C 5 Figure 5 Equivalent stress of the articular disc A B C 6 Figure 6 Eequivalent stress of the glenoid fossa of the temporal bone A B C CADNURBSCAD 1.5 mm 0.20 mm [7] Unig-raphicsNX 8.5 (Siemens) 6 mm8 mm Unig- raphicsnx ANSYS (ANSYS) ISSN CN /R CODEN: ZLKHAH 5765

4 [8-9] [10-11] 2 1 Table 1 Parameters of different tissues (MPa) Table 2 Physiological cross-sectional area and maximum strength of the masticatory muscle (cm ) (N) Results 2.1 (52.72 MPa)3 (7.27 MPa) (10.65 MPa) 4 (19.60 MPa) (MPa) Table 3 Comparison of the equivalent stress of each part in the three-dimensional finite element model of the temporomandibular joint (10.73 MPa)(11.64 MPa) Discussion [12-14] [15-16] [17] [18] [19-21] 5766 P.O. Box 10002, Shenyang

5 . Ansys 13.0 [9] [22-23] 1 1 [24] [25-28] [ ] 1 [31] 1 [32-33] [34-35] [36] [37] [38] () 1 1 [39] 1 [1240] (CONSORT ) (STROBE ) CNKI 3 () References [1],,.[J].,2015,10(27): [2].1 [D]., [3] Kalha AS. Early orthodontic treatment reduced incisal trauma in children with class II malocchsions. Evid Based Dent, 2014, 15(1): [4].1() [J].,2012,5(8): [5],,,.() [J].,2012,19(6): ISSN CN /R CODEN: ZLKHAH 5767

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doi: /j.issn

doi: /j.issn 19 42 2015 10 08 Chinese Journal of Tissue Engineering Research October 8, 2015 Vol.19, No.42 ( 300070 300041 301900 300072 610010) 1 MIMICS ANSYS 2 3 MIMICS ANSYS 4 (BSSRO) MIMICS ANSYS (2013KR11) CT