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KMID : 1149720190090020057
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Clinical Journal of Korean association of Orthodontists
2019 Volume.9 No. 2 p.57 ~ p.71
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Effect of Antero-Posterior Position of the Midpalatal Mini-Implant on the Intrusion of Maxillary Posterior Teeth: A Three-Dimensional Finite Element Analysis
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Choi Kwang-Hyo
Yang Il-Hyung
Baek Seung-Hak
Ahn Sug-Joon
Lim Won-Hee
Lee Shin-Jae
Kim Tae-Woo
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Abstract
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Objective: This study evaluated the effect of the antero-posterior position of the midpalatal orthodontic mini-implant during maxillary posterior teeth intrusion using three-dimensional finite element model (3D-FEM) analysis.
Methods: A 3D-FEM was constructed from the computed tomography (CT) data of an adult male patient. Three simulation models were constructed according to the midpalatal mini-implant position: Model 1, at the interproximal level of the second premolar and first molar; Model 2, at the mesiopalatal cusp level of the first molar; and Model 3, at the interproximal level of the first and second molars. A 200-g force was applied from the bilateral hooks of the transpalatal arch (TPA) to the location of the mini-implant.
Results: In all models, the whole maxillary teeth showed intrusive movement, most at the second molar. As the mini-implant was positioned more posteriorly, intrusive displacement of the posterior teeth increased, while the intrusion and labioversion of the anterior teeth decreased. The palatal tipping movement of posterior teeth was remarkable. The highest stress value was shown on the trifurcation and palatal root surface area of the first molar.
Conclusion: A posteriorly positioned midpalatal mini-implant was more effective to intrude the maxillary posterior teeth without undesirable anterior teeth intrusion or labioversion. Expansion or buccal torque bending of the TPA could prevent the palatal tipping of the posterior teeth.
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KEYWORD
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FEM, Micro-implant, Orthodontic mini-implant, Tooth movement, Midpalatal mini-implant, Intrusion
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