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KMID : 1149720210110020089
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Clinical Journal of Korean association of Orthodontists
2021 Volume.11 No. 2 p.89 ~ p.101
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Biomechanical Analysis for Total Arch Distalization according to Location of Force Application and Types of Temporary Skeletal Anchorage Devices
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Lee Jung-Youn
Park Jae-Hyun
Lee Nam-Ki
Kim Jae-Hyun
Chae Jong-Moon
Kook Yoon-Ah
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Abstract
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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.
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KEYWORD
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Molar distalization, Modified C-palatal plate, Buccal miniscrews, Finite element analysis
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