Biomechanical Analysis for Total Arch Distalization according to Location of Force Application and Types of Temporary Skeletal Anchorage Devices
이정윤, 박재현, 이남기, 김재현, 채종문, 국윤아,
소속 상세정보
이정윤 ( Lee Jung-Youn ) - Catholic University Graduate School of Clinical Dental Science Department of Orthodontics
박재현 ( Park Jae-Hyun ) - A.T. Still University Arizona School of Dentistry & Oral Health Postgraduate Orthodontic Program
이남기 ( Lee Nam-Ki ) - Seoul National University Bundang Hospital Section of Dentistry Department of Orthodontics
김재현 ( Kim Jae-Hyun ) - Catholic University College of Medicine Seoul St. Mary’s Hospital Department of Orthodontics
채종문 ( Chae Jong-Moon ) - Wonkwang University School of Dentistry Department of Orthodontics
국윤아 ( Kook Yoon-Ah ) - Catholic University College of Medicine Seoul St. Mary’s Hospital Department of Orthodontics
Abstract
Introduction: The purposes of this study were to analyze the displacement pattern of the maxillary dentition according to the location of the force applied and the vertical position of the hook on the palatal retraction arch (PRA) when
the dentition is distalized using the palatal plate, and to compare those done by buccal miniscrew using finite element analysis. Methods: A finite element model was created and consisted of four treatment modalities with fifteen
models.
Modalities 1, 2, and 3 used modified C-palatal plates (MCPPs) with a short, medium, and long length PRA
respectively and each modality included four models that had anterior hooks with vertical position of 0, 4, 7, and 10
mm respectively. In modality 4, miniscrews were placed on the buccal side. For each model, a force of 300 g per side
was applied.
Results: The long length PRA with a hook at 0 mm was the most effective model for distalization of
the maxillary dentition. The short and medium-length PRAs caused uncontrolled distal tipping. Displacement of the
molars using a long length PRA with a short hook led to intrusion, but with the long hook, it caused extrusion. Buccal
miniscrews with hook lengths at zero caused first molars to distally tip and intrude. The molar crowns showed more
distal displacement and extrusion as the hook length increased.
Conclusions: Long length PRAs with MCPPs were
the most effective for bodily distal movement of the maxillary molars. This information should be useful when applying temporary skeletal anchorage devices (TSADs) during total arch distalization.
키워드
Molar distalization; Modified C-palatal plate; Buccal miniscrews; Finite element analysis
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