Department of Dental Sciences, Faculty of Medicine, University of Liege, Quai Godfroid Kurth, 45, 4000, Liege, Belgium.
Lasers Med Sci. 2010 Nov;25(6):855-9. doi: 10.1007/s10103-009-0719-7. Epub 2009 Aug 15.
The purpose of this study was to compare the tensile bond strength of composite resin bonded to erbium:yttrium-aluminium-garnet (Er:YAG) laser-prepared dentine after different durations of acid etching. The occlusal third of 68 human third molars was removed in order to expose the dentine surface. The teeth were randomly divided into five groups: group B (control group), prepared with bur and total etch system with 15 s acid etching [37% orthophosphoric acid (H(3)PO(4))]; group L15, laser photo-ablated dentine (200 mJ) (laser irradiation conditions: pulse duration 100 micros, air-water spray, fluence 31.45 J/ cm(2), 10 Hz, non-contact hand pieces, beam spot size 0.9 mm, irradiation speed 3 mm/s, and total irradiation time 2 x 40 s); group L30, laser prepared, laser conditioned and 30 s acid etching; group L60, laser prepared, laser conditioned and 60 s acid etching; group L90, laser prepared, laser conditioned and 90 s acid etching. A plot of composite resin was bonded onto each exposed dentine and then tested for tensile bond strength. The values obtained were statistically analysed by analysis of variance (ANOVA) coupled with the Tukey-Kramer test at the 95% level. A 90 s acid etching before bonding showed the best bonding value (P < 0.05) when compared with all the other groups including the control group. There is no significance difference between other groups, nor within each group and the control group. There was a significant increase in tensile bond strength of the samples acid etched for 90 s.
本研究旨在比较 Er:YAG 激光制备牙本质后不同酸蚀时间对复合树脂粘结强度的影响。为了暴露牙本质表面，从 68 个人类第三磨牙的咬合面去除第三磨牙的咬合面的三分之一。将牙齿随机分为五组：B 组（对照组），用涡轮手机和全酸蚀系统制备，酸蚀时间 15 s[37%磷酸（H(3)PO(4))]；L15 组，激光光蚀牙本质（200 mJ）（激光照射条件：脉宽 100 微秒，水气喷雾，能量密度 31.45 J/cm(2)，10 Hz，非接触式手机，光斑大小 0.9mm，照射速度 3mm/s，总照射时间 2 x 40s）；L30 组，激光制备，激光处理后酸蚀 30 s；L60 组，激光制备，激光处理后酸蚀 60 s；L90 组，激光制备，激光处理后酸蚀 90 s。将一块复合树脂粘结到每个暴露的牙本质表面上，然后测试其拉伸粘结强度。采用方差分析（ANOVA）结合 Tukey-Kramer 检验，在 95%置信水平下对获得的数据进行统计学分析。与包括对照组在内的所有其他组相比，在粘结前进行 90 s 的酸蚀显示出最佳的粘结值（P < 0.05）。其他各组之间、每组与对照组之间均无显著差异。经 90 s 酸蚀后的样品拉伸粘结强度显著增加。
