Barceleiro Marcos de Oliveira, de Mello Jose Benedicto, de Mello Guilherme Scarpel, Dias Kátia Regina Hostílio Cervantes, de Miranda Mauro Sayão, Sampaio Filho Helio Rodrigues
Department of Dentistry, Dental School, Fundação Educacional Serra dos Orgãos, Teresópolis, RJ, Brazil.
Oper Dent. 2005 May-Jun;30(3):304-10.
Dentinal surfaces prepared with Er:YAG laser have significantly different characteristics from those prepared with conventional instruments. Different hybrid layer morphologies and thicknesses occur, which may result in differences in the quality of restorations placed on dentinal surfaces prepared with a diamond bur when compared with using an Er:YAG Laser. This study compared the hybrid layer thickness and morphology formed utilizing Scotchbond Multipurpose Plus (SBMP) on dentin prepared with a diamond bur in a high speed handpiece and dentin prepared with an Er:YAG laser. Flat dentin surfaces obtained from five human teeth were treated with the two methods and then with the dentin adhesive system according to the manufacturer's instructions. After a layer of composite was applied, the specimens were sectioned, flattened, polished and prepared for SEM observation. Ten different measurements of hybrid layer thickness were obtained along the bonded surface in each specimen. Results showed that SBMP produced a 3.43 +/- 0.75 microm hybrid layer in dentin prepared with a diamond bur. This hybrid layer was regular and constantly found. In the laser group, the dentin adhesive system produced a 1.54 +/- 0.35 microm hybrid layer that was very irregular and not found constantly. Statistical analysis of variance (p < 0.05) showed that there was a statistically significant difference between the groups. These data indicate that the Er:YAG laser, with parameters used in the experiment, is not a preparation method that allows for a thick hybrid layer formation, which is in opposition to using a diamond bur in a high speed turbine.
用铒激光制备的牙本质表面与用传统器械制备的牙本质表面具有显著不同的特性。会出现不同的混合层形态和厚度，与使用铒激光制备牙本质表面相比，这可能导致在用金刚砂车针制备的牙本质表面上进行修复时修复质量存在差异。本研究比较了使用多功能强力Scotchbond（SBMP）在高速手机中用金刚砂车针制备的牙本质和用铒激光制备的牙本质上形成的混合层厚度和形态。从五颗人牙获得的平坦牙本质表面用这两种方法进行处理，然后根据制造商的说明用牙本质粘结系统进行处理。施加一层复合树脂后，将标本切片、平整、抛光并准备进行扫描电镜观察。在每个标本的粘结表面沿不同方向获得了十个混合层厚度的测量值。结果表明，SBMP在使用金刚砂车针制备的牙本质中产生了3.43±0.75微米的混合层。该混合层规则且始终存在。在激光组中，牙本质粘结系统产生了1.54±0.35微米的混合层，该混合层非常不规则且并非始终存在。方差统计分析（p<0.05）表明两组之间存在统计学上的显著差异。这些数据表明，在实验中使用的参数条件下，铒激光不是一种能形成厚混合层的制备方法，这与在高速涡轮机中使用金刚砂车针的情况相反。
