Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil.
Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
Odontology. 2021 Oct;109(4):770-778. doi: 10.1007/s10266-021-00598-0. Epub 2021 Mar 11.
To evaluate in vitro transenamel/transdentinal of penetration of HO after microabrasive. Computational models were performed to verify peroxide penetration and evaluate if geometric modifications could affect in vitro results. Enamel/dentin blocks from bovine incisors were prepared and randomly divided into groups (n = 15) according with abrasive (35% phosphoric acid and pumice or 6.6% hydrochloric acid and silica) and bleaching agents (16% carbamide peroxide and 35% HO). From artificial pulp chambers, the HO concentration was measured and SEM was used for surface morphology. Numerical models were performed (Abaqus® v6.12) modifying slightly enamel/dentin thickness based on experimental data. All groups presented HO penetration, although no significant difference was noted between the control and experimental groups (p > 0.05). The numerical analysis demonstrated the role of dental tissue thickness in the HO penetration. Microabrasion is recommended as its association with bleaching procedures and small modifications in thicknesses of enamel/dentin can cause substantial changes in HP penetration. Such diffusion aspect is clinically relevant for the bleaching procedures since very thin enamel could present more peroxide propagation through dental tissues.
为了评估 HO 在微研磨后的牙釉质/牙本质内的体外渗透性，我们进行了计算模型以验证过氧化物的渗透，并评估几何修正是否会影响体外结果。从牛切牙制备牙釉质/牙本质块，并根据研磨剂（35%磷酸和浮石或 6.6%盐酸和二氧化硅）和漂白剂（16%尿素过氧化物和 35%HO）将其随机分为组（n=15）。从人工牙髓腔中测量 HO 浓度，并使用 SEM 观察表面形态。根据实验数据，对数值模型进行了（Abaqus® v6.12）的修正，略微改变了牙釉质/牙本质的厚度。所有组均有 HO 渗透，尽管实验组和对照组之间没有显著差异（p>0.05）。数值分析表明了牙本质厚度在 HO 渗透中的作用。建议使用微研磨，因为它与漂白程序有关，并且牙釉质/牙本质厚度的微小变化可能会导致 HP 渗透的实质性变化。这种扩散方面对于漂白程序具有临床意义，因为非常薄的牙釉质可能会使更多的过氧化物通过牙组织传播。
