Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 7 2 2010 06 15 64 70 MS. Ahmad Akhoundi Associate Professor, Dental Research Center, Tehran University of Medical Sciences, Tehran, Iran M. Rahmati Kamel Orthodontist, Private Practice T. Hooshmand Assistant Professor, Department of Dental Materials, School of Dentistry, Tehran University of Medic I. Harririan Associate Professor, Department of Pharmaceutics, School of Pharmacy, Tehran University of Medical S MJ. Kharazi Fard Statistical Consultant, Dental Research Center, Tehran University of Medical Sciences, Tehran, Iran H. Noroozi Assistant Professor, Dental Research Center, Tehran University of Medical Sciences, Tehran, Iran 2015 10 03 Objective:   The aim of this study was to evaluate the bond strength between metal brackets and non-glazed ceramic with three different surface treatment methods. Materials and Methods: Forty-two non-glazed ceramic disks were assigned into three groups. Group I and II specimens were etched with 9.5% hydrofluoric acid. Subsequently in group I, silane and adhesive were applied and in group II, bonding agent was used only. In group III, specimens were treated with 35% phosphoric acid and then silane and adhesive were applied. Brackets were bonded with light-cured composites. The specimens were stored in water in room temperature for 24 hours and then thermocycled 500 times between 5°C and 55°C. Results: The difference of tensile bond strength between groups I and III was not significant (P=0.999). However, the tensile bond strength of group II was significantly lower than groups I, and III (P<0.001). The adhesive remnant index scores between the three groups had statistically significant differences (P<0.001). Conclusion: With the application of scotch bond multi-purpose plus adhesive, we can use phosphoric acid instead of hydrofluoric acid for bonding brackets to non-glazed ceramic restorations.     https://fid.tums.ac.ir/index.php/fid/article/view/211 https://fid.tums.ac.ir/index.php/fid/article/download/211/211