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Quintessence Publishing: Journals: ORTHODONTICS
The Art and Practice of Dentofacial Enhancement

Formerly World Journal of Orthodontics

Edited by
Rafi Romano, DMD, MSc (Editor-in-Chief)

ISSN 2160-2999 (print) / ISSN 2160-3006 (online)

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Yearbook 2013
Volume 14 , Issue 1

Share Abstract:

Shear bond strength of orthodontic brackets bonded to porcelain following etching with Er:YAG laser versus hydrofluoric acid

Soghra Yassaei, DDS, MS/Farshad Moradi, DDS/Hossein Aghili/Mohamad Hosein Lotfi Kamran

DOI: 10.11607/ortho.856

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. ORTHODONTICS (CHIC) 2013;14:e82e87. doi: 10.11607/ortho.856

Key words: laser, shear bond strength, hydrofluoric acid, Er:YAG

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