@Article{, title={Shear bond strength of stainless steel brackets bonded to porcelain surface treated with 1.23% acidulated phosphate fluoride gel compared to hydro fluoric acid with silane coupling agent (In vitro comparative study)}, author={Tariq M. M. Al-Najjar طارق النجار and Fakhri A. Ali فخري عبد علي}, journal={Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد}, volume={25}, number={special issue 1}, pages={167-173}, year={2013}, abstract={Background: With the increasing demands for adult orthodontics, a growing need arises to bond attachments toporcelain surfaces. Optimal adhesion to porcelain surface should allow orthodontic treatment without bond failurebut not jeopardize porcelain integrity after debonding.The present study was carried out to compare the shear bondstrength of metal bracket bonded to porcelain surface prepared by two mechanical treatments and by usingdifferent etching systems (Hydrofluoric acid 9% and acidulated phosphate fluoride 1.23%).Materials and Methods: The samples were comprised of 60 models (28mm *15mm*28mm) of metal fused to porcelain(feldspathic porcelain). They were divided as the following: group I (control): the porcelain surface left untreatedand glazed, group II (Diamond bur group): the porcelain surface was treated with fine diamond bur at speed of350000 rpm for 20 seconds, group III (Red stone bur): the porcelain surface was treated with coarse red stone bur atspeed of 8500 rpm for 20 seconds. Each group consists of 20 samples, then each group subdivided into twosubgroups; one treated with acidulated phosphate fluoride 1.23% and the other subgroup treated with Hydrofluoricacid 9 % with silane coupling agent.Results: The result of this study revealed that there was very high significant difference among all tested groups andthe highest shear bond strength was for diamond bur group with HFA and Silane (8.67 MPa), the 2nd highest strengthwas for control group with HFA and Silane (7.52 MPa), the 3rd was (7.38 MPa) in red stone bur with HFA and Silane,the least shear bond strength values were obtained for subgroups treated with acidulated phosphate fluoride gel1.23%.Conclusions: The most reliable procedure for bonding orthodontic brackets to the porcelain surfaces is through thesurface treatment combinations of mechanical roughening by using diamond bur, 9% Hydrofluoric acid and Silanecoupling agent application

} }