Akpinar Yusuf Ziya, Irgin Celal, Yavuz Tevfik, Aslan Muhammed Ali, Kilic Hamdi Sukur, Usumez Aslihan
1 Department of Prosthodontics, Faculty of Dentistry, University of Abant Izzet Baysal , Bolu, Turkey .
Photomed Laser Surg. 2015 Apr;33(4):206-12. doi: 10.1089/pho.2014.3791. Epub 2015 Mar 19.
The aim of this study was to investigate the effects of femtosecond laser treatment (Group FS) on the shear bond strength (SBS) of a metal bracket to prepared porcelain surface, and to compare it with other surface treatment techniques [50 μm Al2O3 sandblasting (Group SB), 9.6% hydrofluoric acid gel (Group HF), and neodymium-doped yttrium aluminium garnet (Nd:YAG laser) (Group NY)].
Because of the increasing number of adult patients in current orthodontic practice, achieving sufficient bond strength of composite resin to porcelain restorations without bond failure during the treatment is a challenge for orthodontists.
In total, 80 glazed feldspathic porcelain samples were prepared and randomly assigned to four groups of 20. Treated surfaces were treated with a silane agent. Brackets were bonded to porcelain samples. The specimens were stored in distilled water for 24 h and then thermocycled for 500 cycles between 5° and 55°C. The SBS of the brackets was tested with a universal testing machine at a crosshead speed of 1 mm/min, until bonding failure occurred. The data were analyzed statistically using analysis of variance (ANOVA) and Tamhane multiple comparisons tests. The results of ANOVA indicated that the SBS values varied according to the surface treatment method (p<0.001).
Results of the Tamhane post-hoc tests indicated that the bond strength in Group NY (5.11±1.53) was significantly lower than the other groups (p<0.05). There were no statistically significant differences among Groups SB (9.07±3.76), HF (9.09±3.51), and FS (11.58±4.16) (p=0.28).
The results of this study showed that FS treatment produced high SBS of the processes assessed; therefore, it appears to be an effective method for bonding orthodontic metal brackets to prepared porcelain surfaces.
本研究旨在探讨飞秒激光治疗（FS组）对金属托槽与预备好的瓷表面之间剪切粘结强度（SBS）的影响，并将其与其他表面处理技术进行比较[50μm氧化铝喷砂处理（SB组）、9.6%氢氟酸凝胶处理（HF组）和掺钕钇铝石榴石（Nd:YAG激光）处理（NY组）]。
由于当前正畸治疗中成年患者数量不断增加，正畸医生面临的一个挑战是在治疗过程中使复合树脂与瓷修复体达到足够的粘结强度且不发生粘结失败。
总共制备了80个釉质长石瓷样本，并随机分为四组，每组20个。对处理后的表面使用硅烷剂进行处理。将托槽粘结到瓷样本上。将样本在蒸馏水中储存24小时，然后在5℃至55℃之间进行500次热循环。使用万能试验机以1mm/min的十字头速度测试托槽的SBS，直至发生粘结失败。使用方差分析（ANOVA）和塔姆哈尼多重比较检验对数据进行统计学分析。方差分析结果表明，SBS值因表面处理方法而异（p<0.001）。
塔姆哈尼事后检验结果表明，NY组的粘结强度（5.11±1.53）显著低于其他组（p<0.05）。SB组（9.07±3.76）、HF组（9.09±3.51）和FS组（11.58±4.16）之间无统计学显著差异（p=0.28）。
本研究结果表明，FS处理在所评估的过程中产生了较高的SBS；因此，它似乎是将正畸金属托槽粘结到预备好的瓷表面的一种有效方法。
