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Orthodontics 14 (2013), No. 1     15. June 2013
Orthodontics 14 (2013), No. 1  (15.06.2013)

Online Article, Page 82-87

Online Article: Shear bond strength of orthodontic brackets bonded to porcelain following etching with Er:YAG laser versus hydrofluoric acid
Yassaei, Soghra / Moradi, Farshad / Aghili, Hossein / Kamran, Mohamad Hosein Lotfi
Aim: 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).
Methods: 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.
Results: 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.
Conclusion: Er:YAG laser can be a suitable method for bonding of orthodontic brackets to porcelain surfaces.

Keywords: laser, shear bond strength, hydrofluoric acid, Er:YAG
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