Attia Mariana Lerner, Aguiar Flávio Henrique Baggio, Mathias Paula, Ambrosano Glaucia Maria Bovi, Fontes Céres Mendonça, Liporoni Priscila Christiane Suzy
Department of Restorative Dentistry, Taubaté School of Dentistry, UNITAU, Taubaté, Saõ Paulo, Brazil.
Am J Dent. 2009 Jun;22(3):175-9.
To quantify the change in color of human and bovine teeth exposed to a coffee solution during a 16% carbamide peroxide (16% CP) home application bleaching treatment using photoreflectance analysis.
40 enamel slabs (4 x 4 x 2 mm) were obtained from seven unerupted third human molars and seven bovine incisors, which were allocated into four groups: G1: human control group whitened and not exposed to a coffee solution; G2: bovine control group whitened and not exposed to a coffee solution; G3: human teeth whitened and exposed to a coffee solution; G4: bovine teeth whitened and exposed to a coffee solution. The home bleaching procedure was performed using 16% CP gel applied in a 1 mm-thick layer on the tooth surface over a period of 6 hours per day, for 28 days. Tooth color was evaluated using photoreflectance analysis throughout the bleaching procedure at intervals of 7, 14, 21 and 28 days, and posttreatment at 7, 15 and 30 days. Results were statistically analyzed using ANOVA and Tukey-Kramer tests.
After 28 days of bleaching treatment, no significant difference was detected between photoreflectance analysis of specimens exposed to coffee solution and specimens not exposed to coffee solution (P < 0.05). However, when the teeth were exposed to a coffee solution during home bleaching treatment, the whitening effect was observed to be less stable (P < 0.05). Bovine and human enamel substrates behaved similarly in terms of staining and bleaching effects, although they presented inherent differences in color (P < 0.05).
通过光反射分析，量化在家庭应用16%过氧化脲（16% CP）漂白治疗期间，暴露于咖啡溶液中的人牙和牛牙的颜色变化。
从七颗未萌出的人类第三磨牙和七颗牛切牙中获取40块釉质块（4×4×2毫米），将其分为四组：G1：美白且未暴露于咖啡溶液的人类对照组；G2：美白且未暴露于咖啡溶液的牛对照组；G3：美白且暴露于咖啡溶液的人牙组；G4：美白且暴露于咖啡溶液的牛牙组。家庭漂白程序使用16% CP凝胶，以1毫米厚的层涂覆在牙齿表面，每天进行6小时，持续28天。在漂白过程中，每隔7、14、21和28天以及治疗后7、15和30天，使用光反射分析评估牙齿颜色。结果采用方差分析和Tukey-Kramer检验进行统计学分析。
经过28天的漂白处理后，暴露于咖啡溶液的标本和未暴露于咖啡溶液的标本的光反射分析之间未检测到显著差异（P < 0.05）。然而，当牙齿在家庭漂白治疗期间暴露于咖啡溶液时，美白效果观察到不太稳定（P < 0.05）。牛和人类釉质基质在染色和漂白效果方面表现相似，尽管它们在颜色上存在固有差异（P < 0.05）。
