Effect of Antero-Posterior Position of the Midpalatal Mini-Implant on the Intrusion of Maxillary Posterior Teeth: A Three-Dimensional Finite Element Analysis
최광효, 양일형, 백승학, 안석준, 임원희, 이신재, 김태우,
소속 상세정보
최광효 ( Choi Kwang-Hyo ) - Honors Orthodontic Clinic
양일형 ( Yang Il-Hyung ) - Seoul National University School of Dentistry Department of Orthodontics
백승학 ( Baek Seung-Hak ) - Seoul National University School of Dentistry Department of Orthodontics
안석준 ( Ahn Sug-Joon ) - Seoul National University School of Dentistry Department of Orthodontics
임원희 ( Lim Won-Hee ) - Seoul National University School of Dentistry Department of Orthodontics
이신재 ( Lee Shin-Jae ) - Seoul National University School of Dentistry Department of Orthodontics
김태우 ( Kim Tae-Woo ) - Seoul National University School of Dentistry Department of Orthodontics
Abstract
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.
키워드
FEM; Micro-implant; Orthodontic mini-implant; Tooth movement; Midpalatal mini-implant; Intrusion
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