Programa de Pós-graduação em Odontologia, Universidade Federal de Sergipe, Aracaju, SE, Brasil.
Departamento de Odontologia, Universidade Federal de Sergipe, Aracaju, SE, Brasil.
J Appl Oral Sci. 2020 Dec 16;29:e20200511. doi: 10.1590/1678-7757-2020-0511. eCollection 2020.
To evaluate the effect of the association between external and internal tooth bleaching on color changes in dentin and enamel, individually or recombined, previously stained with triple antibiotic paste (TAP).
Forty enamel-dentin specimens from bovine incisors were separated into ten blocks according to similarity in their whiteness index (WID). Three specimens within each block were stained by dentin exposure to TAP, and the remaining specimen was used as control to estimate color changes. Specimens were sectioned to separate tissues, and dentin and enamel colors were measured individually and after being recombined. Alterations in color (CIEDE2000 - ΔE00) and translucency parameter (TP) resulting from staining were estimated by color difference between stained and control specimens. The contribution of each tissue to the color change (CTCC) was also calculated. Non-sectioned stained specimens were bleached by applying sodium perborate on dentin, associated or not with 35% hydrogen peroxide on enamel. Color changes caused by bleaching procedures were estimated and data were analyzed using the paired t-test or Two-way repeated measures ANOVA.
TAP caused more pronounced changes in dentin, but enamel color was also affected. Both protocols presented a similar ΔE00, and dentin showed the greater color change. After exposure to TAP, we observed a reduction in WID; WID values were the same for bleached and control specimens regardless of protocol. We found no significant effect of substrate and bleaching technique on TP. Enamel played a more critical role in color changes caused by either staining or bleaching procedures.
Enamel color played a greater role on tooth color changes than dentin. External and internal bleaching association did not improve bleaching effect on specimens stained with TAP.
评估牙外源性和牙内源性漂白联合对内源性染色的牙本质和牙釉质颜色改变的效果，分别或联合使用三抗牙托（TAP）。
从牛切牙中分离出 40 个牙本质-牙釉质标本，根据其白度指数（WID）的相似性分为 10 个块。每个块内的 3 个标本暴露于 TAP 以染色牙本质，其余标本作为对照来估计颜色变化。标本被切片以分离组织，单独和组合后测量牙本质和牙釉质的颜色。通过比较染色和对照标本之间的颜色差异来估计染色引起的颜色变化（CIEDE2000-ΔE00）和半透明度参数（TP）的变化。还计算了每个组织对颜色变化的贡献（CTCC）。未切片的染色标本通过在牙本质上应用过硼酸钠，或与牙釉质上的 35%过氧化氢联合进行漂白。通过比较处理前后的颜色变化来估计漂白程序引起的颜色变化，并使用配对 t 检验或双向重复测量方差分析来分析数据。
TAP 对牙本质的影响更明显，但牙釉质颜色也受到影响。两种方案的ΔE00 相似，牙本质的颜色变化更大。暴露于 TAP 后，WID 值降低；无论方案如何，漂白后的标本和对照标本的 WID 值相同。我们发现基底和漂白技术对 TP 没有显著影响。在由染色或漂白程序引起的颜色变化中，牙釉质的作用更为关键。
牙釉质的颜色对牙齿颜色变化的影响大于牙本质。牙外源性和牙内源性漂白联合对 TAP 染色的标本的漂白效果没有改善。
