Int J Stomatol

Inter J Stomatol ›› 2015, Vol. 42 ›› Issue (5): 557-561.doi: 10.7518/gjkq.2015.05.017

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Three-dimensional finite element analysis for the influence of micro-implant pitch on micro-implant-bone interface

Yan Dan1, Zhang Xizhong2, Wang Zengquan1, Wang Jianguo2, Guan Zejian3.   

  1. 1. Dept. of Orthodontics, FoshanStomatological Hospital, Foshan 528000, China; 2. Dept. of Orthodontics, Tianjin Stomatological Hospital, Tianjin 300041, China; 3. Dept. of Stomatology, Foshan Hospital of Traditional Chinese Medicine, Chancheng National Hi-Tech Industrial Development Zone Branch, Foshan 528000, China
  • Received:2015-02-12 Revised:2015-04-23 Online:2015-09-01 Published:2015-09-01

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Abstract:

Objective To analyze the stress distribution at micro-implant-bone interface and the displacement of microimplant based on different pitch and to apply the theoretical reference for choosing orthodontic anchorage micro-implant and optimize design of micro-implant. Methods The three-dimensional finite element models of micro-implant with different pitches and mandible were established by Pro/E; the elements were divided by Hypermesh. The force of 1.96 N was applied on the top of the implant parallel to the mandible surface to analyze the differences of the micro-implant displacement and that of the force on the micro-implant-bone interface. Results The maximum Von-mises stress focused on the neck and tip of micro-implant. The peak Von-mises stress and displacement on the neck of micro-implant are both the smallest, which are 27 MPa and 0.001 5 mm respectively, and the stress and displacement curves are the flattest at the pitch of 0.5 mm than that of other sizes. Conclusion The pitch of micro-implant influences the stress distribution on micro-implant and bone surface. The stress and displacement on both micro-implant-bone interface and micro-implant are both the smallest in the 0.5 mm case of other micro-implant parameters in this work.

Key words: finite element analysis, mandible, orthodontic anchorage procedures, micro-implant, pitch


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