Three-dimensional finite element analysis of maxillary anterior teeth retraction force system in light wire technique
10.7518/hxkq.2015.03.016
- VernacularTitle:细丝弓技术舌侧内收上颌前牙的三维有限元生物力学分析
- Author:
Xiangfeng ZHANG
1
;
Chao WANG
;
Xi XIA
;
Feng DENG
;
Yi ZHANG
Author Information
1. 重庆医科大学附属口腔医院正畸科
- Keywords:
light wire technique;
lingual orthodontic force system;
three-dimensional finite element model;
biomechanics
- From:
West China Journal of Stomatology
2015;(3):291-295
- CountryChina
- Language:Chinese
-
Abstract:
ObjectiveThis?study?aims?to?construct?a?three-dimensional?finite?element?model?of?a?maxillary?anterior?teeth?retraction?force?system?in?light?wire?technique?and?to?investigate?the?difference?of?hydrostatic?pressure?and?initial?displacement?of?upper?anterior?teeth?under?different?torque?values?of?tip?back?bend.?Methods???A?geometric?three-dimensional?model?of?the?maxillary?bone,?including?all?the?upper?teeth,?was?achieved?via?CT?scan.?To?construct?the?force?model?system,?lingual?brackets?and?wire?were?constructed?by?using?the?Solidworks.?Brackets?software,?and?wire?were?assembled?to?the?teeth.?ANASYS?was?used?to?calculate?the?hydrostatic?pressure?and?the?initial?displacement?of?maxillary?anterior?teeth?under?different?tip-back?bend?moments?of?15,?30,?45,?60,?and?75?Nmm?when?the?class?Ⅱ?elastic?force?was?0.556?N.?Results???Hydrostatic?pressure?was?concentrated?in?the?root?apices?and?cervical?margin?of?upper?anterior?teeth.?Distal?tipping?and?relative?intrusive?displacement?were?observed.?The?hydrostatic?pressure?and?initial?displacement?of?upper?canine?were?greater?than?in?the?central?and?lateral?incisors.?This?hydrostatic?pressure?and?initial?intrusive?displacement?increased?with?an?increase?in?tip-back?bend?moment.?Conclusion???Lingual?retraction?force?system?of?maxillary?anterior?teeth?in?light?wire?technique?can?be?applied?safely?and?controllably.?The?type?and?quantity?of?teeth?movement?can?be?controlled?by?the?alteration?of?tip-back?bend?moment.
