渗透型树脂治疗釉质龋颜色稳定性的短期研究

摘要

目的:测定渗透型树脂暴露在光照下颜色的稳定性.方法:32颗离体牙用脱矿液脱矿,形成釉质龋,随机分为实验组(A组)和对照组(B组),然后用渗透型树脂处理.实验组每天进行光照实验,对照组避光处理.用Crystaleye分光光度计电脑比色仪分别在树脂渗透前和渗透后24 h、15 d、1个月、3个月5个时间点,对两组牙齿进行比色.分别记录每次比色后每颗牙齿的L*、a*、b*值,根据色差公式△E=[(△L*)2+(△a*)2+(△b*)2]1/2,以渗透后24 h为基线,计算出各组△E值,比较离体牙不同时间段和处理方式的色差变化有无统计学差异.结果:A组渗透后各时间段总色差值在1.15～2.33之间,B组渗透后各个时间段总色差值在0.8～2.31,均未超过人肉眼可明显辨别的范围.结论:渗透型树脂对光照反应不明显,实验组和对照组没有明显的差异.%Objective: To determine the color stability of infiltration in carious lesions subject to exposured to light irradiation (sun test).Methods:32 artifical incipient lesions created out of extracted teeth following a demineralization protocol were divided in two groups (n=16): After infiltration, group A underwent a sun test.Group B served as a control and was stored in aquadest for 3 months.CIE L*a*b*values, were taken at 5 intervals: before infiltration and 24 h ,15 days, 1 month, 3 months after infiltration by using Olympus Crystaleye spectrophotometer.Acording to △E=[( △L* )2+( △a* )2+( △b* )2]1/2, △L, △a, △b and △E values were calculated to determine the extent of color change.Results: After infiltration,total △E values of group A was between 1.15~2.33,and group B was 0.8~2.31.The change of colour could not be detected evidently by human eyes.Conclusion: Light irradiation will not influence the colour of infiltration.