摘要： 目的 探讨混合牙列期无托槽隐形矫治器的扩弓效率。方法 选取2019年至2021年于青岛大学附属医院口腔正畸科就诊并使用隐形矫治器扩弓的混合牙列患者32例,收集矫治前、排牙预置及矫治后的三维数字化模型,分别测量上下颌牙尖水平和龈缘水平牙弓宽度及磨牙颊倾度,计算各牙位扩弓效率。配对样本t检验比较矫治前、排牙预置及矫治后牙弓差异宽度。结果 矫治后各牙位牙弓宽度显著增加(P<0.05),上颌乳尖牙、第一乳磨牙、第二乳磨牙、第一恒磨牙区牙尖水平扩弓效率分别为69%、70%、71%、61%,龈缘水平扩弓效率分别为63%、55%、59%、47%;下颌相应牙位牙尖水平扩弓效率分别为84%、78%、76%、69%,龈缘水平分别为69%、68%、64%、56%。矫治后上颌第一恒磨牙颊倾(1.19±3.56)°,下颌第一磨牙颊倾(5.54±3.03)°,实际颊倾量大于预置值(P<0.05)。结论 隐形矫治器能在替牙期实现有效的上下颌扩弓,乳尖牙及乳磨牙区扩弓效率较高,龈缘水平扩弓效率低于牙尖水平,第一恒磨牙实际颊倾量大于预置值。

无托槽隐形矫治混合牙列扩弓效率的研究

赵睿^1,2, 刘洋^1,2, 吕翱³, 郭学强⁴, 刘新强^1,2

1. 青岛大学附属医院口腔正畸科, 山东 青岛 266003;
2. 青岛大学口腔医学院口腔正畸学教研室, 山东 青岛 266003;
3. 滨州医学院口腔医学院牙体牙髓病学教研室, 山东 烟台 264003;
4. 青岛市妇女儿童医院口腔科, 山东 青岛 266003

收稿日期:2022-03-01出版日期:2022-12-30发布日期:2022-12-12
通讯作者:刘新强E-mail:dentistlxq@163.com
作者简介:赵睿 (1995-)，女，硕士研究生.
基金资助:国家自然科学基金(82001086)


关键词: 混合牙列, 早期矫治, 无托槽隐形矫治器, 扩弓, 效率
Abstract: Objective To evaluate the efficiency of arch expansion with clear aligners in the mixed dentition stage. Methods Thirty-two patients in the early mixed dentition stage who underwent arch expansion with clear aligners were included in this study. We collected the three-dimensional digital models of pre-treatment， planned the treatment using the ClinCheck software， and performed post-treatment. Linear values of upper and lower arch widths were measured at two different points： the lingual gingival margin and cusp tip. T-test was used to compare the changes of arch width. Results The upper expansion efficiencies at the cusp tips of the primary canine， first primary molar， second primary molar， and first permanent molar were 69%， 70%， 71%， and 61%， and the expansion efficiencies at the gingival margins were 63%， 55%， 59%， and 47%， respectively. The lower expansion efficiencies at the cusp tips of the corresponding tooth positions were 84%， 78%， 76%， and 69%， and the expansion efficiencies at the gingival margins were 69%， 68%， 64%， and 56%. The buccal inclination of the maxillary first permanent molar was 1.19±3.56°， and that of the mandibular first permanent molar was 5.54±3.03°. The actual buccal inclination was greater than the planned value(P<0.05). Conclusion Clear aligners can achieve effective expansion at the mixed dentition stage. The expansion efficiencies of primary canines and primary molars were relatively high. The expansion efficiency at the gingival margin was lower than that at the cusp tip. The actual buccal inclination of the first permanent molar was greater than the planned value.
Key words: mixed dentition, early orthodontic intervention, clear aligner appliances, expansion, efficiency
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