In-vitro bond strength comparison of orthodontic adhesives on different surfaces in the presence of moisture

Aim: Bracket material, adhered surface, adhesive and precision in application are factors affecting bracket bond strength. Dry and clean surfaces necessary for the success of conventional orthodontic adhesives. In cases where humidity control is difficult, the use of moisture insensitive adhesives can be advantageous. This research aims to evaluate the bond strength of sapphire and metal brackets to ceramic and tooth surfaces by moisture insensitive adhesives. Material and Method: 32 groups (n: 12) were created to compare the bond strength of metal and sapphire brackets on human teeth and ceramic surfaces using 8 different adhesive combinations (Transbond XT Primer(3M)+Transbond XT Paste(3M), Transbond MIP(3M)+Transbond XT Paste(3M), Transbond SEP(3M)+ Transbond XT Paste(3M), Assure® Plus All Surface Bonding Resin(Reliance)+Assure Paste(Reliance), Fuji Ortho LC(GC), SmartBond LC Adheziv(Gestenco), PrimeMaster LC(Dentsply), BracePaste MTP(American Orthodontics)+BracePaste(American Orthodontics)). In experimental groups surfaces have been moistened before the moisture insensitive adhesives were applied. Shear bond strength test was applied to the samples after hydrothermal aging. The types of fracture were scored according to the ARI system and some samples were analysed by SEM. The datas were evaluated statistically. Results: The highest bond strength in all groups, the control group applied on the dry surface was observed in the combination of Transbond XT. In groups where metal brackets are bonded to the moist tooth surface, the highest bond strength was found to be the combination of the Transbond SEP and the lowest binding values belong to the combinations of Assure, FUJI Ortho LC and SmartBond LC. The highest values in the groups where sapphire brackets are bonded to the tooth surface; PrimeMaster LC belongs to the combinations of Transbond MIP and Transbond SEP, while the lowest values belong to FUJI Ortho LC and SmartBond LC adhesives. The highest bond strength was observed in the Transbond SEP combination and the lowest bond strength in the Assure combination in groups where metal brackets were bonded to the moist ceramic surface. In groups where sapphire brackets are attached to the ceramic surface, the highest bond strength were observed in the combinations of PrimeMaster LC, Transbond MIP and Transbond SEP, and the lowest bond strength were observed in SmartBond LC, FUJI Ortho LC and Assure combinations. Conclusion: In-vitro bond strength in all groups were higher than minimum orthodontic bond strength.