Crystaleye比色仪和目测法比色准确性的比较

Comparison of shade matching accuracy by visual observation and Crystaleye spectrophotometer

目的比较Crystaleye比色仪和目测法比色的准确性。方法对21位受试者的左上颌中切牙分别用目测法和Crystaleye比色仪比色,并根据2种比色结果为每位受试者制作2个金属烤瓷冠,分别为目测组和Crys-taleye组,用Crystaleye比色仪测定每组金属烤瓷冠与天然牙颈、中、切色差ΔE、ΔL*、Δa*、Δb*值,对差值进行配对t检验(α=0.05)。每位受试者和2名医师分别对2个金属烤瓷冠颜色准确性进行评分,对2组得分进行t检验(α=0.05)。结果除金属烤瓷冠中部Δb*值外(P<0.05),2组ΔE、ΔL*、Δa*、Δb*值的差异均无统计学意义(P>0.05)。目测评分,Crystaleye组平均分为22.90分,目测组平均分为23.14分,2组差异无统计学意义(t=0.370,P=0.715)。结论临床上可用Crystaleye比色仪辅助医师比色。

Objective To compare the accuracy of two shade-matching approaches： visual method and Crystaleye spectrophotometer.Methods Twenty-one participants＇maxillary left central incisors were evaluated.Corresponding metal ceramic crowns were fabricated with each shade-matching approach.The color distributions（L＊,a＊ and b＊） of the cervical,middle,and incisal regions of each tooth and corresponding metal ceramic crowns were spectrophotometrically assessed.The color difference（ΔE） and color distributions（ΔL＊,Δa＊ and Δb＊） between the tooth and the corresponding crowns were calculated.The ΔE,ΔL＊,Δa＊ and Δb＊ values were compared using paired t test separately.Each participant and two dentists evaluated the color matching accuracy by scored it from 1 to 10.The values were compared using paired t test.Results Regarding ΔE and the three color distributions,no significant difference was found,except for b＊（P0.05） of the middle third region.No significant difference was found regarding values of the two groups.Conclusion Crystaleye spectrophotometer can be used in clinic to assist dentists in shade matching process.