Ortodontik metal braketlerin farkli yüzey pürüzlendirme yöntemleri uygulanan amalgam yüzeylerine olan bağlanma dayanikliliğinin değerlendirilmesi

Bonding orthodontic brackets to extensive amalgam restorations on buccal aspect of molar teeth is still a challenge for orthodontists. This study aims to compare two systems of sand blasting with their adhesive, and to investigate the effects of E-glass fiber (E-GF) on shear bonding strength (SBS). 12 extracted molar teeth enamel serves as control group, 72 amalgam samples divided into 6 groups. Groups 2 and 3 were blasted with aluminum oxide 50 µm and treated with Kuraray alloy primer (KAP) on the amalgam surface in group2 and on amalgam surface and bracket base in group 3. Samples in groups 4, 6 were blasted by silane coating system with application of Relyx silane coupling agent in group 4 and addition of piece of (E-GF) in group 6, for group 7 samples were treated like group 6 with the application (KAP) on the bracket base, only group 5 was not sandblasted and the (E-GF) are applied directly on the polished amalgam surface. All groups were bonded with Transbons XT adhesive system. The results reported that SBS to amalgam samples were lower than the enamel samples in all groups, only group 4 revealed SBS value not significantly different from control group, regarding the ARI scores the results show bond failure occur at amalgam adhesive interface with the (E-GF) groups, Conclusion: None of the amalgam groups record SBS higher than enamel, Silicatization of amalgam is a useful method for bonding orthodontic brackets to amalgam, and using of (E-GF) decrease the cohesive failure and amalgam damage during debonding.