目测法比色准确性的评价

Evaluation of Visual Shade Matching.

目的 评价目测法比色的准确性。方法 选用Shofu比色板和Vita比色板各两块 ,两种比色板各一块为比色标准 ,另一块为测试标本。相同比色板之间和不同比色板之间相互比色。测试者分为试验人群和对照人群 ,试验人群为 15名有 4～ 7年金瓷修复经验的修复科医生 ,对照人群为 15名非修复科医护人员。按测试方法得 8组数据。结果 试验人群的色调符合率为 4 7.0 8%～ 5 2 .0 8% ,对照人群的色调符合率为 35 .0 0 %～ 37.92 %。两种比色板相互比色之间无差异 ,而两个人群的比色结果间有显著差异。结论 目测法比色的色调符合率不高 ,有比色经验者较易选择正确的色调。

Objective To evaluate a visual ability test for shade matching. Methods A test was devised to measure the ability of observers in matching ceramic shade guides. There were 15 prosthodontists in the experimental group and 15 persons consisting of 6 surgeons, and 9 nurses in the control. The experimental group was subdivided into four groups according to test methods and so was the control four group. The test, which would be referred to as the 'Shofu-Shofu' test, the 'Shofu-Vita' test, the 'Vita-Vita' test, and the 'Vita-Shofu' test, required individual tabs of 2 Shofu shade guides and 2 Vita shade guides. The rates of correct matches in both groups were comparaed by chi square test. Results The rates of correct shade matches in four subgroups of the experiment were 49.17%, 47.08%, 52.08% and 47.92% separately according to their test methods in order, whereas 37.92%, 35.83%, 36.25% and 35.00% were obtained in four subgroups of the control, and no significant differences were found among the subgroups. Significant differences existed between the experimental group and the control. Conclusion The accuracy of visual correct shade matching should be improved by training for color discrimination.