Lago Andréa Dias Neves, de Freitas Patricia M, Netto Narciso Garone
Department of Restorative Dentistry, School of Dentistry of São Paulo, University of São Paulo, São Paulo, SP, Brazil.
Photomed Laser Surg. 2011 Feb;29(2):91-5. doi: 10.1089/pho.2009.2728. Epub 2011 Jan 10.
The use of laser irradiation for dental surface treatment may increase tooth-composite bond strength. Its use on bleached teeth may decrease the waiting time between bleaching and restorative procedures.
This study aimed to evaluate the bond strength between a composite resin and bovine enamel bleached with 35% hydrogen peroxide and etched with Er:YAG laser.
Thirty bovine teeth were randomly divided into six groups (n = 5): G1, unbleached and restored 24 h after storage in artificial saliva, etching with 35% phosphoric acid (PA) (control); G2, unbleached and restored 24 h after storage in artificial saliva, etching with Er:YAG laser and 35% PA; G3, bleached and restored immediately afterward, etching with 35% PA; G4, bleached and restored 24 h after bleaching, etching with 35% PA; G5, bleached and restored immediately afterward, etching with Er:YAG and 35% PA laser; G6, bleached and restored 24 h after bleaching, etching with Er:YAG laser and 35% PA. Bond strength was quantitatively evaluated by microtensile test (1.0 mm/min). Data were submitted to statistical analysis using ANOVA and Tukey tests (α = 0.05).
Bond strength values (MPa) were G1, 26.17 ± 4.44; G2, 28.87 ± 3.94; G3, 17.25 ± 4.58; G4, 21.93 ± 5.02; G5, 16.69 ± 2.31; and G6, 29.06 ± 8.31. There was no statistically significant difference among groups G1, G2, and G6 (p = 0.119), which presented higher bond strength than group G4, followed by groups G3 and G5.
Er:YAG irradiation of bleached surfaces may favor bonding procedures when performed 24 h after bleaching.
使用激光照射进行牙齿表面处理可能会提高牙齿与复合树脂的粘结强度。在漂白牙齿上使用激光照射可能会减少漂白和修复程序之间的等待时间。
本研究旨在评估复合树脂与经35%过氧化氢漂白并用铒钇铝石榴石（Er:YAG）激光蚀刻的牛牙釉质之间的粘结强度。
30颗牛牙随机分为6组（n = 5）：G1组，保存在人工唾液中24小时后未漂白并进行修复，用35%磷酸（PA）蚀刻（对照组）；G2组，保存在人工唾液中24小时后未漂白并进行修复，用Er:YAG激光和35%PA蚀刻；G3组，漂白后立即进行修复，用35%PA蚀刻；G4组，漂白后24小时进行修复，用35%PA蚀刻；G5组，漂白后立即进行修复，用Er:YAG激光和35%PA蚀刻；G6组，漂白后24小时进行修复，用Er:YAG激光和35%PA蚀刻。通过微拉伸试验（1.0毫米/分钟）对粘结强度进行定量评估。数据采用方差分析和Tukey检验进行统计分析（α = 0.05）。
粘结强度值（MPa）分别为：G1组，26.17±4.44；G2组，28.87±3.94；G3组，17.25±4.58；G4组，21.93±5.02；G5组，16.69±2.31；G6组，29.06±8.31。G1、G2和G6组之间无统计学显著差异（p = 0.119），这三组的粘结强度高于G4组，其次是G3组和G5组。
漂白后24小时对漂白表面进行Er:YAG照射可能有利于粘结程序。
