Effect of bracket slot and archwire dimensions on anterior tooth movement during space closure in sliding mechanics: A 3-dimensional finite element study

Jun Ya Tominaga, Hiroya Ozaki, Pao Chang Chiang, Mayumi Sumi, Motohiro Tanaka, Yoshiyuki Koga, Christoph Bourauel, Noriaki Yoshida

Research output: Contribution to journalArticle

36 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)166-174
Number of pages9
JournalAmerican Journal of Orthodontics and Dentofacial Orthopedics
Issue number2
Publication statusPublished - Jan 1 2014
Externally publishedYes


ASJC Scopus subject areas

  • Orthodontics

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