Caneppele Taciana M, Borges Alessandra B, Torres Carlos R
Department of Restorative Dentistry, Sao Jose dos Campos Dental School, Sao Paulo, Brazil.
Eur J Esthet Dent. 2013 Summer;8(2):200-12.
The objective of this study was to evaluate the color, translucency and fluorescence of bovine enamel and dentin submitted to different bleaching modalities. Pairs of enamel and dentin discs (3 mm in diameter) were obtained from 150 bovine teeth. In 75 of the pairs, one specimen had the enamel removed (Dentin Group). The dentin was removed from one specimen of the remaining 75 pairs (Enamel Group) and the other specimen was left unaltered (Enamel + Dentin). The evaluation of color, translucency and fluorescence was performed with a spectrophotometer using the CIE L* a* b*. Each group was subdivided into three subgroups: Control, composed of specimens that were not bleached, and two experimental subgroups, bleached with either 10% carbamide peroxide (CP10%) or 35% hydrogen peroxide (HP35%). The CP10% bleaching gel was applied 2 h/day for 14 days. The HP35% bleaching agent was applied using two applications of 30 min each, with a one week interval between each application. When not being bleached, the specimens were immersed in artificial saliva. The color, translucency and fluorescence ratings were assessed using spectrophotometry 7 days after the treatment. Regarding color, significant differences were found between bleaching techniques in the groups Enamel and Enamel + Dentin, with a higher color difference for HP35%. Bleaching did not change the translucency of the dental tissues. There were significant differences for fluorescence for the HP35% subgroups of Dentin and Enamel + Dentin, and for the CP10% subgroup of Enamel. Dental bleaching changed the color and fluorescence of the dental tissues, however translucency was not affected.
本研究的目的是评估经过不同漂白方式处理的牛牙釉质和牙本质的颜色、半透明度和荧光。从150颗牛牙中获取成对的牙釉质和牙本质圆盘（直径3毫米）。在75对样本中，一个样本的牙釉质被去除（牙本质组）。在其余75对样本中的一个样本上去除牙本质（牙釉质组），另一个样本保持不变（牙釉质 + 牙本质组）。使用分光光度计采用CIE L* a* b* 对颜色、半透明度和荧光进行评估。每组再细分为三个亚组：对照组，由未漂白的样本组成；两个实验组，分别用10%过氧化脲（CP10%）或35%过氧化氢（HP35%）进行漂白。CP10%漂白凝胶每天涂抹2小时，持续14天。HP35%漂白剂分两次涂抹，每次30分钟，每次涂抹间隔一周。在不进行漂白时，将样本浸泡在人工唾液中。在处理7天后使用分光光度法评估颜色、半透明度和荧光等级。关于颜色，在牙釉质组和牙釉质 + 牙本质组中，漂白技术之间存在显著差异，HP35%的颜色差异更大。漂白未改变牙体组织的半透明度。牙本质组和牙釉质 + 牙本质组的HP35%亚组以及牙釉质组的CP10%亚组在荧光方面存在显著差异。牙齿漂白改变了牙体组织的颜色和荧光，但半透明度未受影响。
