支架
前牙
门牙
上颌中切牙
材料科学
口腔正畸科
运动(音乐)
扭矩
功率(物理)
生物力学
机械
物理
解剖
结构工程
工程类
医学
声学
热力学
量子力学
作者
Jun Tominaga,Hiroya Ozaki,Pao Chang Chiang,Mayumi Sumi,Motohiro Tanaka,Yoshiyuki Koga,Christoph Bourauel,Noriaki Yoshida
标识
DOI:10.1016/j.ajodo.2014.04.016
摘要
Introduction It has been found that controlled movement of the anterior teeth can be obtained by attaching a certain length of power arm onto an archwire in sliding mechanics. However, the impact of the archwire/bracket play on anterior tooth movement has not been clarified. The purpose of this study was to compare the effect of the power arm on anterior tooth movements with different dimensions of bracket slots and archwires. Methods A 3-dimensional finite element method was used to simulate en-masse anterior tooth retraction in sliding mechanics. Displacements of the maxillary central incisor and the archwire deformation were calculated when applying retraction forces from different lengths of power arms. Results When a 0.017 × 0.022-in archwire was engaged into the 0.018-in slot bracket, bodily movement of the incisor was obtained with 9.1-mm length of the power arm. When a 0.022-in slot system was coupled with a 0.019 × 0.025-in archwire, bodily movement was observed with a power arm length of 11.6 mm. Conclusions Archwire/bracket play has a remarkable impact on anterior tooth movement. An effective torque application to the anterior teeth becomes clinically difficult in sliding mechanics combined with power arms when the archwire/bracket play is large.
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