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建立双侧尖牙垂直龈向异位3mm及双侧侧切牙水平腭向异位3mm的Typodont模型,分为MDD、MBT、自锁和Tip-Edge 4组,每组5副,共40副。45℃恒温水浴下用直径0.30mm镍钛圆丝排齐30min。ATOS流动光学三维扫描仪扫描水浴前、后模型获得三维数字图像。Geomagic软件将水浴前后数字图像重叠,通过色图分析得出尖牙各标志点垂直向、侧切牙各标志点水平向及矢状向移动变化数据,SAS 9.2统计软件对数据进行二因子方差分析。研究结果发现尖牙各标志点垂直向、侧切牙各标志点水平向及矢状向移动变化MDD组均小于其他3组(P<0.0001)。Typodont模型上牙齿位移大小直接与力量大小相关。研究结果初步提示排齐阶段MDD矫治器具有轻力矫治的特点,与其副槽沟的改良及单结扎翼设计有关。
A Typodont model of bilateral gingival ectopic 3mm and bilateral palatal ectopic 3mm was established. The model was divided into 4 groups: MDD, MBT, self-locking and Tip-Edge. 45 ℃ constant temperature water bath with a diameter of 0.30mm nickel titanium wire alignment 30min. The ATOS Mobile Optical 3D Scanner scans the water bath before and after the model gets three-dimensional digital images. Geomagic software overlaid the digital images before and after the water bath, and analyzed the horizontal and sagittal movement data of the vertical and lateral incisors of each mark of the canines by color chart analysis. SAS 9.2 statistical software performed two-factor analysis of variance on the data. The results showed that the horizontal and sagittal movements of the vertical and lateral incisors at each mark of canines were significantly lower in MDD group than in the other three groups (P <0.0001). The size of a tooth displacement on a Typodont model is directly related to the size of the force. The results suggest that the MDD appliance has the characteristics of mild correction, which is related to the improvement of its secondary channel and the design of single ligation.