Clear aligner orthodontic force and conformity during lateral expansion
Clear aligner orthodontic force and conformity during lateral expansion
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侧向扩张期间清晰的矫治器正畸力和顺应性
DOI：
10.1080/27705781.2023.2179814
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Maki K.
中科院分区：
文献类型：
--
作者：
Suzuki S;Nakano H;Kataoka Y;Maki K.
本研究旨在通过实验比较矫治器的边缘类型与矫治力和第一磨牙上的顺应性(漂浮)之间的关系，找出最不容易发生颊倾斜的矫正器形式。材料和方法使用四种不同的边缘类型(常规矫治器不覆盖腭部、部分腭部覆盖[有或没有颊向延伸2.0 mm]和完全腭部覆盖)和三种水平的侧向扩张(无扩张、0.25 mm扩张和0.50 mm扩张)。通过在左侧第一磨牙的腭侧安装压力传感器来测量施加在第一磨牙上的力，该压力传感器安装在模型上的上颌收缩牙弓上。结果传统矫正器在0.25 mm和0.50 mm的扩张力上无显著差异，但在中点和颈侧有明显的漂浮。随着扩张度的增加，三种类型的腭侧覆盖矫正器的受力均显著增加(P<；P<；(0.01)；与常规类型相比，上浮程度较小(P<；P<；(0.01))。在0.25 mm扩弓和无扩弓的情况下，腭部完全覆盖矫正器的上浮程度较小。结论传统的上颌矫正器由于扩弓后上浮增加，磨牙颊侧倾斜度较大。扩展0.25 mm的完全腭部覆盖矫正器具有最好的符合性，这表明它们可以防止磨牙意外的颊倾斜，并允许侧向扩张按预期发生。
PurposeThis study aimed to find the clear aligner form which buccal tipping is less likely to occur by experimentally comparing the marginal type of the aligners with the orthodontic force and conformity (flotation) on the first molars during lateral expansion.Materials and methodsFour different marginal types (conventional aligners with no palatal coverage, partial palatal coverage [with or without 2.0 mm buccal extension], and complete palatal coverage) and three levels of lateral expansion (no expansion, 0.25-mm expansion, and 0.50-mm expansion) were used. The force applied to the first molar was measured by attaching a pressure sensor to the palatal side of the left first molar on a modelled maxillary constricted dental arch. The conformity (flotation) was measured by micro-CT with each aligner attached to the model.ResultsConventional aligners showed no significant difference in force at 0.25-mm or 0.50-mm expansion, but significant flotation at the midpoint and cervical side. The force of all three types of palatal coverage aligners increased significantly (p< 0.01) with increasing expansion and showed less flotation (p< 0.01) compared to the conventional type. Complete palatal coverage aligners had little flotation at 0.25-mm expansion and no expansion.ConclusionConventional aligners should have greater buccal tipping of the molars due to increased flotation with expansion. Complete palatal coverage aligners with 0.25-mm expansion had the best conformity, suggesting that they may prevent unplanned buccal tipping of the molars and allow lateral expansion to occur as intended.
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DOI：
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发表时间：
2019-01-01
影响因子：
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作者：
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DOI：
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发表时间：
2022
期刊：
Clinical and Investigative Orthodontics
影响因子：
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作者：
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影响因子：
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10.1016/j.ajodo.2020.04.033
发表时间：
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影响因子：
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