Monghini Elisângela M, Wanderley Rosimeyri L, Pécora Jesus D, Palma Dibb Regina G, Corona Silmara A M, Borsatto Maria C
Department of Pediatric Clinic, Preventive and Social Dentistry, Ribeirão Preto School of Dentistry, University of São Paulo (USP), Avenida do Café S/N Monte Alegre Cep:14040-904 Ribeirão Preto-SP, Brasil.
Lasers Surg Med. 2004;34(3):254-9. doi: 10.1002/lsm.20023.
This study aimed to assess in vitro the influence of Er:YAG laser energy on the shear bond strength of a total-etch adhesive to lased dentin of primary teeth, and observe under SEM the morphological appearance of laser-ablated dentin surfaces.
STUDY DESIGN/MATERIALS AND METHODS: For SBS, specimens were irradiated with the energies 60 mJ/2 Hz (G2), 80 mJ/2 Hz (G3), 100 mJ/2 Hz (G4). Control (G1) was not irradiated. Dentin surfaces were acid-etched, Single Bond adhesive (3 M) was applied, and resin cylinders were fabricated from Z250 resin (3 M). Bond strength was tested in shear (0.5 mm/min). For morphological analysis, specimens were irradiated using the same energies, either or not acid-etched, and observed by SEM.
SBS means, in MPa, were: G1-17.89(+/-4.75); G2-12.34(+/-4.85); G3-10.30(+/-3.67); G4-10.41(+/-4.20). Overall, Er:YAG laser irradiation of primary teeth dentin, prior to the adhesive protocol, adversely affected bond strength. Furthermore, it was noticed that even though there was no significant difference among the Er:YAG laser-treated groups, the increase of laser energy resulted in increasingly cratered surfaces, regardless of acid-etching association.
本研究旨在体外评估铒钇铝石榴石（Er:YAG）激光能量对全酸蚀黏结剂与乳牙激光照射牙本质之间剪切黏结强度的影响，并通过扫描电子显微镜（SEM）观察激光消融后牙本质表面的形态。
研究设计/材料与方法：对于剪切黏结强度（SBS）测试，将样本分别用60 mJ/2 Hz（G2组）、80 mJ/2 Hz（G3组）、100 mJ/2 Hz（G4组）的能量进行照射。对照组（G1组）不进行照射。对牙本质表面进行酸蚀处理，涂抹单键黏结剂（3M公司），并用Z250树脂（3M公司）制作树脂圆柱体。以0.5 mm/min的速度进行剪切黏结强度测试。对于形态学分析，使用相同能量对样本进行照射，无论是否进行酸蚀处理，然后通过扫描电子显微镜进行观察。
以兆帕（MPa）为单位的剪切黏结强度平均值分别为：G1组-17.89（±4.75）；G2组-12.34（±4.85）；G3组-10.30（±3.67）；G4组-10.41（±4.20）。总体而言，在黏结操作之前，对乳牙牙本质进行Er:YAG激光照射会对黏结强度产生不利影响。此外，还注意到，尽管在Er:YAG激光治疗组之间没有显著差异，但无论是否进行酸蚀处理，激光能量的增加都会导致表面坑洼越来越多。
