Comparison of labio-palatal incisor movement between two wear protocols: a retrospective cohort study.

Max Wei, Tony Weir, Brett Kerr, Elissa Freer
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Abstract

Objectives: To investigate the accuracy of the Invisalign appliance in achieving predicted angular tooth movement of the maxillary central incisors, to locate the center of rotation in a labio-palatal direction, and to investigate any difference between 1-weekly and 2-weekly wear protocols.

Materials and methods: This study involved a retrospective sample of two groups of 46 Class I adult subjects treated non-extraction with different protocols of 1-weekly and 2-weekly wear. The pretreatment, predicted outcome and achieved outcome digital models were superimposed and measured using metrology software. Angular and center-of-rotation measurements in the sagittal plane for the maxillary right central incisor were analyzed.

Results: There was a statistically significant difference between predicted and achieved angular measurements (P < .005) for labial tooth movements regardless of wear protocol. For palatal movements, no statistically significant difference was observed (P > .05). A small amount of overexpression was observed in some cases. Regarding crown and root control, uncontrolled tipping was the most predictable. No statistically significant difference was found between predicted and achieved center of rotation, but the confidence interval was wide. No statistically significant difference (P > .05) was found between the two wear protocols for the parameters measured.

Conclusions: For maxillary central incisors, labial angular movements were not as accurate as palatal movements. Overcorrection could be recommended with careful clinical monitoring due to the possibility of overexpression. Control of root movements may be unpredictable, and further research is required to draw stronger conclusions. For the parameters measured in this clinical sample, there was no difference between the two wear protocols.

两种佩戴方案对唇腭切牙运动的比较:一项回顾性队列研究。
目的:研究Invisalign矫治器在预测上颌中切牙的牙齿角运动方面的准确性,定位唇腭方向的旋转中心,并研究1周和2周磨损方案之间的任何差异。材料和方法:本研究涉及两组46名一级成年受试者的回顾性样本,他们接受了为期1周和2周的不同方案的非拔牙治疗。使用计量软件对预处理、预测结果和实现结果数字模型进行叠加和测量。分析了上颌右中切牙在矢状面上的角度和旋转中心测量值。结果:无论佩戴方案如何,预测和实现的唇牙运动角度测量值之间存在统计学上的显著差异(P<.005)。对于腭部运动,没有观察到统计学上的显著差异(P>0.05)。在某些情况下观察到少量的过度表达。关于冠根控制,不受控制的倾倒是最可预测的。预测和实现的旋转中心之间没有发现统计学上的显著差异,但置信区间很宽。测量的参数在两种磨损方案之间没有发现统计学上的显著差异(P>0.05)。结论:对于上颌中切牙,唇侧角运动不如腭侧运动准确。由于过度表达的可能性,建议在仔细的临床监测下进行过度校正。根系运动的控制可能是不可预测的,需要进一步的研究才能得出更有力的结论。对于在该临床样本中测量的参数,两种佩戴方案之间没有差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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