Biomechanical analysis of mandibular body defect reconstruction with fibula fixed with miniplates

Abstract

Abstract: PURPOSE: To investigate the stress distribution characteristics and displacement of mandibular body defect reconstruction with fibula fixed with miniplates and to provide mechanical reference for clinical practice. METHODS: Finite element model of mandibular body defect reconstruction with fibula fixed with miniplates was established and contralateral molar and incisor vertical loading was simulated. Then stress of plates, screws and displacement of anterior and posterior ends of the fibula were analysed. RESULTS: Stress of corresponding miniplates, screws and displacement values of anterior and posterior fibula in incisor loading condition were larger than that of in molar loading condition. Maximum displacement value of anterior fibula in incisor loading condition was 264.22 microns, while 149.02 microns in molar loading conditions. Maximum stress values of all miniplates occurred in the posterior plate. Maximum stress of screws in the mandibular stumps occurred in the anterior superior screw near the mandible /fibula adjunction. Stress of screws began to decrease along the direction of nail tip, but stress in the one third tip of screw increased. CONCLUSIONS: It is very important to choose bicortical screw when mandibular body defect reconstruction with fibula in fixations. Biting on front teeth before bone healing to reduce the risk of nonunion should be avoided.

Key words: Mandibular defect, Fibula, Miniplates, Biomechanics

CLC Number:

R782.2

YIN Xue-min, LIU Xiong, FU Sheng, ZHANG Jun-wei, XU Guo-xiang. Biomechanical analysis of mandibular body defect reconstruction with fibula fixed with miniplates[J]. China Journal of Oral and Maxillofacial Surgery, 2014, 12(2): 107-111.

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