PDF(Pubmed)
Abstract：
OBJECTIVE: 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.
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.
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.
摘要：
目的：为了研究Invisalign矫治器在实现上颌中切牙的预测角齿运动方面的准确性，在唇腭方向上定位旋转中心，并调查1周和2周佩戴方案之间的任何差异。
方法：这项研究包括两组46名I类成年受试者的回顾性样本，这些受试者采用每周1次和每周2次佩戴的不同方案进行非拔牙治疗。预处理,预测结果和实现结果的数字模型被叠加和测量使用计量软件.分析了上颌右中切牙矢状面的角度和旋转中心测量值。
结果：无论磨损方案如何，唇齿运动的预测和实现的角度测量值（P<.005）之间存在统计学上的显着差异。对于腭运动，差异无统计学意义(P>.05)。在一些情况下观察到少量的过表达。关于冠和根的控制，不受控制的小费是最可预测的。预测的旋转中心和达到的旋转中心之间没有统计学上的显著差异，但置信区间很宽。对于测量的参数,在两种磨损方案之间没有发现统计学上的显著差异(P>.05)。
结论：对于上颌中切牙，唇角运动不如pal运动准确。由于过度表达的可能性，建议进行仔细的临床监测。对根部运动的控制可能是不可预测的，需要进一步研究才能得出更有力的结论。对于在此临床样本中测量的参数，两种穿戴方案之间没有差异.
方法：这项研究包括两组46名I类成年受试者的回顾性样本，这些受试者采用每周1次和每周2次佩戴的不同方案进行非拔牙治疗。预处理,预测结果和实现结果的数字模型被叠加和测量使用计量软件.分析了上颌右中切牙矢状面的角度和旋转中心测量值。
结果：无论磨损方案如何，唇齿运动的预测和实现的角度测量值（P<.005）之间存在统计学上的显着差异。对于腭运动，差异无统计学意义(P>.05)。在一些情况下观察到少量的过表达。关于冠和根的控制，不受控制的小费是最可预测的。预测的旋转中心和达到的旋转中心之间没有统计学上的显著差异，但置信区间很宽。对于测量的参数,在两种磨损方案之间没有发现统计学上的显著差异(P>.05)。
结论：对于上颌中切牙，唇角运动不如pal运动准确。由于过度表达的可能性，建议进行仔细的临床监测。对根部运动的控制可能是不可预测的，需要进一步研究才能得出更有力的结论。对于在此临床样本中测量的参数，两种穿戴方案之间没有差异.
