松风牙龈色板模拟牙龈颜色对分光光度计测量牙齿颜色的影响

Effect of Shofu gingival matrices which simulate the gingival color on spectrophotometric tooth color measurement

目的:探讨在体外实验条件下牙龈颜色对分光光度计测色准确性的影响。方法:用松风牙龈色板模拟不同颜色牙龈,将VITA Classical比色片固定于牙龈色板,在自制测色暗盒中用分光光度计Crystaleye测量比色片及牙龈色板色度值,分析比色片的部位和牙龈色板及它们的交互作用对比色片颜色测量的影响。牙龈色差值及对应的比色板色差值之间的关系用Pearson相关性检验进行统计分析。结果:在颈、中、切三部分的色差值范围分别为1.01～2.26、0.93～1.27和1.67～2.97,颈部各组间的色差值差异均有统计学意义,中部及切端各组差别不明显。牙龈色板颜色、部位和二者的交互作用对色差值都有影响(P<0.001)。牙龈色差与比色片颈、中、切三部分色差间的Pearson相关系数分别是0.646、0.386和0.217(P<0.001)。结论:牙龈颜色对分光光度计测色的影响主要在比色片颈部,颈部的色度值随着牙龈背景的改变而有规律变化。

Objective： To investigate the effect of gingival color on spectrophotometric color measurement in a standardized model.Methods： Shofu gingival matrices were used to simulate the soft tissue and VITA Classical shade tabs were fixed into them.Both the gingival matrices and shade tabs were measured with Crystaleye spectrophotometer in a black box.Regions of the shade tabs,gingival color and their combinated effect on measurements were analyzed,Pearson correlation analysis was used to identify the correlation of the gingival color difference with the shade tabs color difference.Results： The ranges of color difference were 1.01-2.26 in the cervical,0.93-1.27 in the body and 1.67-2.97 in the incisal regions,respectively.Statistical analysis revealed that there was significant difference among all the gingival groups in the cervical region.Color differences were similar in the body and the incisal regions.The color measurement with Crystaleye was influenced by the regions of the shade tabs,the gingival color and their combination（P0.001）.Pearson Correlation Coefficient was 0.646 in the cervical,0.386 in the body and 0.217 in the incisal regions respectively（P0.001）.Conclusion： The color measurement in the cervical region with the spectrophotometer was influenced by the color of the simulated gingiva.Such influence was not obvious in the body and incisal regions.Color coordinates changed regularly with the gingival color.