宁波职业技术学院高层次人才引进科研项目(RC201806), 国家自然科学(51775506), 浙江省自然科学(LY18E050022)
1.Ningbo polytechnic;2.Zhejiang University of Technology;3.Department of Stomotology, Zhejiang Provincial People’s Hospital
目的 口腔正畸治疗中弓丝形状回复产生的矫治力系至关重要，本研究的目的是利用模拟牙颌模型实现正畸弓丝初始回复力的口外测量。方法 以一例临床病例作为研究对象，通过3D（Three- dimensional）打印制作了与患者真实牙列分布相一致的上颌牙颌模型，并以此为基础利用美国Nano17 F/T力学传感器搭建了矫治力测量平台，对直径为0.014英寸的标准圆镍钛弓丝佩戴在牙颌模型上之后，施加在患者2颗上颌中切牙上的初始回复力进行测量。结果 经过测量患者上颌中切牙21受到的初始矫治力较中切牙11更大，且2颗中切牙所受到的矫治力系均不利于牙齿的理想移动，需要添加辅助装置改善牙齿受力状况。在优化正畸治疗方案之后，患者在治疗18个月之后获得了满意的矫治效果。结论 利用患者的模拟牙颌模型可以准确测量正畸弓丝作用在目标牙齿上的矫治力系，进而预估牙齿的移动形式，并以此为基础改进牙齿矫治方案。矫治力的口外测量技术为临床正畸治疗提供了重要参考，为矫治方案的优化设计开创了新思路。
Objective In oral orthodontic treatment, force system caused by archwire shape recovery is very important, the objective of this study was to realize the extra-oral measurement of initial recovery force produced by orthodontic wire using simulated dental model. Methods Taken a clinical patient as study objective, maxillary dental models, which were in accord with the real dentition of patient, were fabricated by three-dimensional printing, further, an orthodontic force measuring platform was constructed using Nano17 F/T mechanical sensors made by America, to measure the initial recovery forces on the two maxillary central incisors, which were produced by a standard circle Ni-Ti wire with a diameter of 0.014 feet after the wire was assembled on the dental model. Results After measurements, central incisor 21 suffered a lager initial orthodontic force compared with incisor 11, and the force systems on two incisors were both adverse to tooth ideal movement, and an assistant device was necessary to improve the force status of teeth. When orthodontic treatment plan was optimized, a satisfactory result was obtained after 18 months of treatment. Conclusions Force systems caused by orthodontic wire and exerted on teeth can be accurately measured using the simulated dental model of patient, and further used to predict teeth moving type, and more to improve teeth treatment plan on this basis. The extra-oral measuring technique of orthodontic force provided an important reference for clinical orthodontic treatment, and created a novel thinking for the optimal design of orthodontic plan.