West China Journal of Stomatology

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Three dimensional finite element analysis of maxillary anterior teeth retraction with micro-implant anchorage and sliding mechanics

ZHANG Yi1, ZHANG Lei2, FAN Yu-bo3, SONG Jin-lin1, DENG Feng1   

  1. 1. Dept. of Orthodontics, The Affiliated Hospital of Stomatology, Chongqing Medical University, Chongqing 400015, China; 2. Biomechanical Engineering Laboratory, College of Architecture and Environics, Sichuan University, Chengdu 610044, China; 3. Dept. of Bioengineering, Beihang University, Beijing 100083, China
  • Received:2009-10-25 Revised:2009-10-25 Online:2009-10-20 Published:2009-10-20
  • Contact: DENG Feng,Tel:13908367763


Objective To investigate the biomechanical effects of micro-implant anchorage technique with sliding mechanics on maxillary anterior teeth retraction under different implant insertion heights and different retraction hook heights. Methods The three dimensional finite element model of maxillary anterior teeth retraction force system was constructed with CT scanning and MIMICS software and the relationships between brackets, teeth, wire and microimplant were simulating the clinical factions. Then the initial tooth displacement was calculated when the insertion heights were 4 mm and 8 mm and the retraction hook heights were 1, 4, 7, 10 mm respectively. Results With retraction hook height added, the anterior teeth movement changed from lingual crown tipping to labial crown tipping and the intrusion movement was more apparent when the micro-implant was inserted in a higher location. Conclusion The ideal teeth movement control could be achieved by different insertion heights of micro-implant and different retraction hook heights in straight wire retraction force system.

Key words: three dimensional finite element, micro-implant anchorage, straight wire