Crystaleye电脑比色仪和目测法比色的临床效果比较

Comparison of clinical effect between spectrophotometric and conventional visual shade

目的:比较Crystaleye分光光度计电脑比色仪比色和目测法的比色效果,探讨电脑比色仪临床使用的可行性。方法:随机选取前牙或第一前磨牙区的单颗Ni-Cr烤瓷全冠修复患者63例,分别用Vitapan classical比色板目测比色法和Crystaleye电脑比色仪比色,根据2种比色方法的比色结果,制作1组修复体(冠V和冠S)。修复后,用Crystaleye电脑比色仪对每组修复体和比色参照的天然牙进行测色,计算每组修复体体部与天然牙体部的总色差⊿E值,采用SPSS13.0软件包对结果进行配对t检验。由患者(p)和医师(d)按照双盲法,分别对2套冠进行比色评价(Vp,Vd,Sp,Sd),对评价结果进行配对χ2检验。结果:V组⊿E(3.13±0.80)和S组⊿E(2.68±0.72)的差异有统计学意义(P<0.001)。比色评价上,Vp组和Sp组差异无统计学意义(P=0.035);Vd组和Sd组的差异有统计学意义(P<0.01);p组和d组差异有统计学意义(P<0.01)。结论:Crystaleye电脑比色仪的比色效果优于肉眼比色,Crystaleye电脑比色仪可用于临床并辅助医师比色。

PURPOSE： To study the feasibility of clinical application of the Crystaleye spectrophotometer, and compare the clinical effect of Crystaleye spectrophotometer with conventional visual shade. METHODS： 63 patients in need of an anterior or a first premolar Ni-Cr porcelain-fused-to-metal crown were enrolled in this study randomly. 2 crowns （crown V and crown S） were prepared for each patient. Crown V was made via conventional visual matching by a commercial shade guide, Vitapan classical method. Crown S was made via a new computer system, Crystaleye spectrophotometer. Clystaleye spectrophotometer was also applied to measure the color of the natural teeth and crowns. The color difference values （DehaE） between the contralateral natural tooth and each of the 2 crowns were calculated in the middle regions. A paired-samples t test was performed based on the DeltaE using SPSS13.0 software package. The color reproducibility of crown V and crown S was evaluated by patients （p） and prosthodontists （d） visually using double-blind method （Vp,Vd,Sp, Sd）. The results were evaluated hy Chi-square test. RESULTS： There was significant difference in the mean DeltaE between crown V （3.13±0.80） and crown S （2.68±0.72）（P〈0.01）. Results of visual evaluation were as follows： no significant difference was tound between crown Vp and crown Sp （P=0.035）; significant difference was found between crown Vd and crown Sd （P〈0.01）;there was also significant difference between crown p and crown d （P〈0.01）. CONCLUSIONS： According to this clinical study, the crowns fabricated based on a dedicated spectrophotometer have a better color matching compared to the ones fabricated via a conventional shade-matching method. Crystaleye spectrophotometer is proved to be a promising instrument for determining tooth color in elinie.