牙位对牙冠颜色影响的研究

目的：从不同的部位比较前牙牙冠之间颜色的差别，方法：采用CIE1976La.b色度参数，应用带光纤探头的人体牙齿颜色测量系统对1944颗颗被测前牙的切，中，颈部进行测量分析，结果：（1）牙冠颜色与牙位 有关：（2）左右侧前牙的颜色对称；（3）上牙以上中切牙明度最大；尖牙明度最小颜色最黄且偏戏，上前牙颈1／3明度相近，上切牙间切1／3，颈1／3色相彩色相同，中1／3除上中切牙与侧切牙在a上较接近外，明度，色相均有差别；（4）下切牙明度大于上切牙，上下尖牙在颈1／3明度基本按近，上下切牙间在切1／3颜色基本接近，（5）下切牙间在中1／3，切1／3处明度相近，而在颈1／3处有差别，在中1／3，颈1／3处b值相近，在切1／3处b值有判别，结论：左右侧前牙在颜色上对称。牙 冠民牙位有关。

A study on color of anterior teeth

Objective To analyse the effects of tooth position on tooth color,and to compare the colorimetry difference of teeth color in different site.Methods A fiber optic spectrophotometry system of human teeth color was used for measurements of 1994 healthy anterior teeth of 162 Chinese,the results obtainded from different site (incisor,cervical,middle) were expressed with CIE 1976 L * a * b * system and CIE 1931 XYZ color system.Results Tooth color was related to its position.At middle site,maxillary cenral incisor had the higher value of L *,canine was redder and yellower and darkest;Mandibular incisor had the higher value of L * than that of maxillary incisor.At cervical site maxillary anterior teeth had a similar value of L *?a * and b *,Mandibullar anterior had a similar value of L *.Maxillary anterior had different value of L * in incisor site.Conclusion The color of two sides of anterior teeth is paralled.The color of teeth is related to tooth position.