Discipline of Orthodontics, School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia.
Discipline of Orthodontics, School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia.
Am J Orthod Dentofacial Orthop. 2024 Dec;166(6):538-548. doi: 10.1016/j.ajodo.2024.07.016. Epub 2024 Oct 21.
Extraction of a single mandibular incisor may be prescribed in conjunction with clear aligner orthodontic treatment. The accuracy of therapeutic mesiodistal tooth positioning for the remaining mandibular anterior teeth for such patients has not been comprehensively evaluated. This retrospective study compared the predicted and achieved mesiodistal tooth movements in the mandibular anterior region for patients treated with Invisalign (Align Technology, Santa Clara, Calif), along with the influence of aligner attachments and the frequency of aligner change.
A sample of 83 subjects who had undergone Invisalign treatment with a single mandibular incisor extraction was collected from an existing database. The pretreatment tooth positions, the predicted mesiodistal tooth movement, and the achieved outcomes were measured for the remaining mandibular anterior teeth using Geomagic Control X metrology software (3D Systems, Rock Hill, SC). The predicted and achieved mesiodistal tip movements were analyzed and compared.
Regression analysis revealed significant differences (P <0.001) between the predicted and achieved mesiodistal tooth positioning for incisors and canines. For every degree of predicted incisor mesiodistal tip, 78.89% of this tip was achieved (R = 0.4901). For every degree of predicted canine tip, 54.16% was clinically expressed (R = 0.5965). The accuracy of mesiodistal tip expression was not significantly affected by the prescribed number of aligners, 1-week vs 2-week aligner change protocols, or the presence of attachments (P >0.05). In addition, incisors were less likely to express the correct direction of the mesiodistal tip predicted than canines (P = 0.020).
A shortfall between the predicted and clinically achieved expression of mesiodistal tooth movement with Invisalign was found for the anterior teeth after a mandibular incisor extraction. The number of aligners, duration of aligner wear, and specific attachment designs were not found to significantly influence the accuracy of the achieved mesiodistal tip movements.
在使用 Clear Aligner 正畸治疗时，可能会建议拔除单个下颌切牙。对于这些患者，下颌前牙剩余的治疗性近远中牙齿定位的准确性尚未得到全面评估。本回顾性研究比较了接受 Invisalign（Align Technology，Santa Clara，加利福尼亚州）治疗的患者的下颌前牙区预测和实际近远中牙齿移动情况，以及矫治器附件的影响和矫治器更换频率。
从现有数据库中收集了 83 名接受过 Invisalign 治疗并拔除单个下颌切牙的患者的样本。使用 Geomagic Control X 计量软件（3D Systems，Rock Hill，SC）测量下颌前牙的治疗前牙齿位置、预测的近远中牙齿移动量和实际结果。分析并比较了预测和实际的近远中切端移动。
回归分析显示，切牙和尖牙的预测和实际近远中牙齿定位之间存在显著差异（P<0.001）。每度预测的切牙近远中切端，实际切端实现了 78.89%（R=0.4901）。每度预测的尖牙切端，临床表达了 54.16%（R=0.5965）。矫治器数量、1 周与 2 周矫治器更换方案、附件的存在对近远中切端表达的准确性没有显著影响（P>0.05）。此外，切牙表达预测的近远中切端方向的准确性低于尖牙（P=0.020）。
在拔除下颌切牙后，使用 Invisalign 时发现前牙的近远中牙齿移动的预测与临床实际表达之间存在差距。矫治器数量、矫治器佩戴时间和特定附件设计并未显著影响实际近远中切端移动的准确性。
