Yassaei Soghra, Moradi Farshad, Aghili Hossein, Kamran Mohamad Hosein Lotfi
Department of Orthodontics, Faculty of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Orthodontics (Chic.). 2013;14(1):e82-7. doi: 10.11607/ortho.856.
The purpose of the present study was to evaluate the shear bond strength of orthodontic brackets bonded to porcelain following etching with erbium-doped yttrium aluminum garnet (Er:YAG) laser compared with 9.6% hydrofluoric acid (HF).
A total of 100 porcelain disk samples were divided into four groups, and after removing their glazed layer, the first group was etched with 9.6% HF, and the other three groups were etched with Er:YAG lasers of 1.6, 2, and 3.2 W, respectively. After application of silane on the disk surfaces, central incisor brackets were bonded with composite on the disks. The disks were mounted on an acrylic stand for measuring the shear bond strengths. The shear bond strengths were measured by a testing machine.
The mean shear bond strength in the laser group with power of 1.6 W (7.88 MPa) was more than that of the HF (7.4MPa), 2-W power (7.52 MPa), and 3.2-W power (7.45 MPa) groups, but this difference was not statistically significant. Examination with an electron microscope showed different patterns of etching by HF and laser. Also, etching by laser and HF had not resulted in cracks on the porcelain surface.
Er:YAG laser can be a suitable method for bonding of orthodontic brackets to porcelain surfaces.
本研究旨在评估与9.6%氢氟酸（HF）相比，掺铒钇铝石榴石（Er:YAG）激光蚀刻后正畸托槽与瓷的剪切粘结强度。
总共100个瓷盘样本被分为四组，去除其釉质层后，第一组用9.6% HF蚀刻，其他三组分别用功率为1.6、2和3.2 W的Er:YAG激光蚀刻。在盘表面施加硅烷后，将中切牙托槽用复合材料粘结在盘上。将盘安装在丙烯酸支架上以测量剪切粘结强度。通过测试机测量剪切粘结强度。
功率为1.6 W的激光组的平均剪切粘结强度（7.88 MPa）高于HF组（7.4MPa）、2-W功率组（7.52 MPa）和3.2-W功率组（7.45 MPa），但这种差异无统计学意义。电子显微镜检查显示HF和激光蚀刻的模式不同。此外，激光和HF蚀刻均未导致瓷表面出现裂纹。
Er:YAG激光可作为正畸托槽粘结至瓷表面的一种合适方法。
