Pimenta-Dutra Ana-Cristina, Albuquerque Rodrigo-de Castro, Morgan Luís-Fernando-Dos Santos-Alves, Pereira Geraldo-Magela, Nunes Eduardo, Horta Martinho-Campolina-Rebello, Silveira Frank-Ferreira
DDS, MS, Graduate student, Departament of Dentistry, Pontifícia Universidade Católica de Minas Gerais, Belo Horizonte, Brasil.
DDS, MS, PhD, Professor, Centro Universitário Newton Paiva, Belo Horizonte, Brazil.
J Clin Exp Dent. 2017 Jan 1;9(1):e46-e50. doi: 10.4317/jced.53011. eCollection 2017 Jan.
This study aimed to evaluate changes in the enamel surface of bovine teeth after whitening with exogenous bleaching agents: 10% carbamide peroxide (group 1), 16% carbamide peroxide (group 2) and 35% hydrogen peroxide activated by a light-emitting diode (LED) (group 3). The evaluations were performed by scanning electron microscopy (SEM).
Ninety bovine teeth were divided into five groups (n = 18). The bleaching agents 10% and 16% carbamide peroxide were applied for eight hours a day for 14 consecutive days. The third agent, LED-activated 35% hydrogen peroxide, was used four times at seven-day intervals. Each of the four time points consisted of three applications of 10 minutes each. A 37% phosphoric acid solution and artificial saliva were used as positive and negative controls, respectively.
The evaluations by SEM showed changes in the enamel surfaces of the specimens. Based on the Mann-Whitney statistical test, the data showed significant differences (<0.05) between groups 1 and 2 and between groups 2 and 3. However, no significant difference (>0.05) was observed between groups 1 and 3.
Based on these results, it can be concluded that bleaching agents can cause changes in the structure of tooth enamel and that these changes are related to the concentration and the duration of contact with the tooth surface. Bovine teeth, carbamide peroxide, enamel, hydrogen peroxide, scanning electronic microscopy.
本研究旨在评估使用外源性漂白剂对牛牙釉质表面的影响，这些漂白剂包括：10%过氧化脲（第1组）、16%过氧化脲（第2组）和由发光二极管（LED）激活的35%过氧化氢（第3组）。通过扫描电子显微镜（SEM）进行评估。
将90颗牛牙分为五组（每组n = 18）。10%和16%过氧化脲漂白剂每天使用8小时，连续使用14天。第三种试剂，LED激活的35%过氧化氢，每隔7天使用4次。四个时间点中的每一个都包括每次10分钟的三次应用。分别使用37%磷酸溶液和人工唾液作为阳性和阴性对照。
SEM评估显示样本的釉质表面有变化。基于曼-惠特尼统计检验，数据显示第1组和第2组之间以及第2组和第3组之间存在显著差异（<0.05）。然而，第1组和第3组之间未观察到显著差异（>0.05）。
基于这些结果，可以得出结论，漂白剂可导致牙釉质结构发生变化，且这些变化与浓度以及与牙齿表面接触的持续时间有关。牛牙、过氧化脲、釉质、过氧化氢、扫描电子显微镜。
