错牙合畸形患者未萌尖牙、前磨牙牙冠宽度的预测

摘要

Objective To make a correlation analysis of crown widths between premolar,cuspid,and other teeth groups in malocclu-sion population. Methods Pre-treatment models of 382 patients (187 males,195 females,aged from 14 to 25 years)were selected from the records of the Orthodontic Department,Stomatology Hospital of Jiangsu Province. According to the Angle′s classification,the subjects were divided into 4 groups:Class I,Class Ⅱ division 1,Class Ⅱ division 2,and Class Ⅲ. The mesiodistal dimensions of teeth were measured using callipers (accurate to 0. 02 mm). Then crown width correlation was analyzed and the prediction equation was set up. Results The correlation coefficients had significantly statistical difference. Equations predicting summation of mesiodistal crown-widths of upper and lower unerupted canine and premolars in male and female were established respectively. The male:U3U4U5 =0. 270X + 3. 504(r2 = 0. 5821),L3L4L5 = 0. 272X + 2. 390(r2 = 0. 5977). The female:U3U4U5 = 0. 221X + 6. 884(r2 = 0. 4951), L3L4L5 = 0. 230X + 5. 173(r2 = 0. 5000)(X represents the summation of the mesiodistal crown widths of upper and lower central inci-sors and first molars). Conclusions The equations predicting summation established by this research were more precise than Moyers regression scheme,and were not influenced by the Angle′s classification.%目的：通过对错牙合畸形患者的尖牙、前磨牙与其他牙（组）牙冠宽度的相关性分析，为错牙合畸形人群的尖牙、前磨牙的牙冠宽度的预测提供科学依据。方法选择南京医科大学附属口腔医院正畸科就诊的江苏籍错牙合畸形患者模型382副，按照安氏Ⅰ、Ⅱ1、Ⅱ2、Ⅲ类分组，测量牙冠宽度，进行尖牙、前磨牙与其他牙（组）的相关性分析，并建立预测方程。结果建立错牙合畸形人群的尖牙、前磨牙牙冠宽度之和的预测方程：男性U3U4U5＝0．270X ＋3．504（r2＝0．5821），L3L4L5＝0．272X ＋2．390（r2＝0．5977）；女性U3U4U5＝0．221X ＋6．884（r2＝0．4951），L3L4L5＝0．230X ＋5．173（r2＝0．5000）。X 为上、下颌中切牙和上、下颌第一磨牙牙冠宽度之和。结论本研究所建立的回归预测方程要优于Moyers 预测法，回归预测方程不因错牙合畸形安氏分类的不同而有差别。