Department of Orthodontics, Dental School, Mashhad University of Medical Sciences, Park Square, Mashhad, Iran.
Lasers Med Sci. 2012 Mar;27(2):321-4. doi: 10.1007/s10103-010-0878-6. Epub 2011 Jan 18.
In this study, shear bond strength (SBS) of metal orthodontic brackets to porcelain following conditioning by Er:YAG (erbium-doped yttrium aluminum garnet) and Nd:YAG (neodymium-doped yttrium aluminum garnet) laser in comparison to conventional methods was evaluated. One hundred glazed porcelain discs with an upper central shape were prepared and randomly assigned to five equal groups of 20. In the first group, samples were only deglazed and roughened by diamond burs. In the second group, after roughening and deglazing of porcelain samples, the samples were etched by 9.6% hydrofluoric acid for 4 min. Groups, 3, 4, and 5 were prepared by 0.8-W Nd:YAG laser, 2-W Er:YAG laser, 3-W Er:YAG laser for 10 s, respectively. Then, metal, mesh-based brackets were bonded to porcelain samples, and after being stored in distilled water for 24 h, debonding was carried out by a Zwick testing machine. ANOVA and Tukey tests were used to compare SBS in five groups. Mean SBS in groups 1 to 5 were 3.3 ± 1.6, 7.0 ± 2.1, 6.9 ± 2.7, 2.3 ± 1.1, and 3.7 ± 2.3 MPa, respectively. ANOVA test revealed a significant difference between five groups (p < 0.05). Although Tukey's test showed SBS in groups 2 and 3 were significantly higher than the other groups, they did not differ with each other significantly (p > 0.05). The results revealed that SBS of 9.6% hydroflouric acid and Nd:YAG Laser was in an acceptable range for orthodontic treatment. Nd:YAG laser was shown to be an acceptable substitute for hydrofluoric acid while Er:YAG laser with the mentioned power and duration was not a suitable option.
本研究旨在评估比较 Er:YAG（掺铒钇铝石榴石）和 Nd:YAG（掺钕钇铝石榴石）激光对金属正畸托槽与瓷釉之间的剪切粘结强度（SBS）的影响，与传统方法相比。制备了 100 个具有上中央形状的釉面瓷盘，并将其随机分为 5 个相等的组，每组 20 个。第一组仅用金刚砂车针进行去釉和粗糙化处理。第二组在对瓷样进行粗化和去釉后，用 9.6%氢氟酸蚀刻 4 分钟。第 3、4 和 5 组分别用 0.8-W Nd:YAG 激光、2-W Er:YAG 激光、3-W Er:YAG 激光处理 10 秒。然后，将金属网基托槽粘结到瓷样上，在蒸馏水中储存 24 小时后，用 Zwick 试验机进行离脱。采用 ANOVA 和 Tukey 检验比较五组 SBS。第 1 至 5 组的平均 SBS 分别为 3.3±1.6、7.0±2.1、6.9±2.7、2.3±1.1 和 3.7±2.3 MPa。ANOVA 检验显示五组之间存在显著差异（p<0.05）。尽管 Tukey 检验表明第 2 组和第 3 组的 SBS 显著高于其他组，但它们之间没有显著差异（p>0.05）。结果表明，9.6%氢氟酸和 Nd:YAG 激光的 SBS 在正畸治疗的可接受范围内。Nd:YAG 激光可以替代氢氟酸，而在上述功率和时间下的 Er:YAG 激光则不是一个合适的选择。
