PMID: 30146639Aug 28, 2018Paper

Effect of different root control attachments on the mesially movement of upper molar with plastic aligner

Shanghai kou qiang yi xue = Shanghai journal of stomatology
Hong ZengHong-Wei Dai

Abstract

Three-dimensional (3D) finite element analysis (FEA) was used to explore the mechanical effect of the upper molar with different root control attachment in plastic aligner-based orthodontic technology. A three-dimensional(3D) finite element model was derived from a cone-beam CT(CBCT) scan data and then built in the software of Mimics, Geomagic, Solidworks and Ansys. A model with an upper left first molar and its periodontal apparatus, different types of light-cured composite attachments and thermoformed plastic aligners were constructed. Four models were constructed: model A without composite attachments, model B with vertical rectangular attachment, model C with one optimized semiterete attachment, model D with two optimized semiterete attachments. Four FE models were used to analyze the effects of initial force system and displacement pattern of the molar in plastic aligner-mediated simulating mesial movement with different attachments. The initial tooth displacement, tension-compression pattern at the PDL and Von Mises stress in mesial alveolar fossa of different FE models were compared. In model D with two optmisied semiterete attachments, the compression stress of mesial periodontal ligament and the stress of mesial alveol...Continue Reading

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