目的 探究无托槽隐形矫治器力学平台的测量误差来源，为后续优化力学测量平台的使用提供参考。 方法 以原始模型3D打印树脂牙并组装形成力学测量平台的装配模型，对装配模型进行扫描，分别以原始模型（A组）和装配模型（B组）使用热压膜材料压制无设计量的隐形矫治器，通过对A、B组的模型进行重叠分析和牙弓宽度测量，直接比较两组模型的匹配程度。使用力学平台测量两组矫治器戴入后树脂牙的三维受力，通过t检验比较两组牙齿受力情况的差异，间接比较两组模型间的差异。结果 经过测量和重叠分析，A、B组模型平均存在-0.126～0.188mm的偏差。利用原始模型和装配模型制作的无设计量隐形矫治器戴入力学平台后，每个树脂牙均在三维方向上受到一定的力，使用原始模型制作的矫治器产生的力更大。除33和32唇舌向受力；32、31和46垂直向受力，其余位点在两组矫治器戴入时牙齿的受力差异均有显著的统计学意义（P<0.05）。结论 装配模型与原始模型之间存在差异，产生一定的系统误差。为了减小安装过程导致的误差，需要在装配完力学平台后对树脂牙列进行三维扫描，并在装配模型基础上设计加工隐形矫治器。
Objective To investigate errors of the force measurement system for clear aligners and to provide suggestion for optimizing the use of this system. Methods The original model was 3D printed and assembled to form the assembly model of the force measurement system. The original and assembly model were named group A and B. Then the assembly model was scanned. GroupA and B model were respectively used to manufacture clear aligners with no activation by thermoforming material respectively. In order to compare whether group A and B models matched well, we carried out overlapping and measured arch width of the two models. Then the force measurement system was used to measure the three-dimensional forces of the teeth received. Student t test was used to compare the differences of measured forces between two groups, which indirectly described the differences between models of the two groups. Results There was an average deviation of -0.126 to 0.188 mm in the models of group A and B after overlapping analysis and measurement of arch width. When the clear aligners made by the original model or assembly model were put on the force measurement system, a certain amount of three-dimensional forces would be measured. The clear aligners made by original model group produced larger forces than that made by the assembly model. Significant differences of the forces between the two groups could be observed in most sites, except the labial & lingual forces of tooth 33 or 32 received, and vertical forces of 32, 31 or 46 received. Conclusions The discrepancy between the original model and the assembly model would affect the measurement of the orthodontic force produced by clear aligners and produce certain systematic errors. In order to reduce the errors generated in the installation procedure, it is necessary to perform a 3D scan of the resin dentition after assembling the force measurement system and to design clear aligners based on the assembly model.