Evaluation of the shear bond strength of four orthodontic adhesive systems

Aims: To evaluate shear bond strength of four types of orthodontic adhesive systems including twopaste composite (Concise), lightcured composite (Transbond), nomix composite (Alphadent) and lightcured glass ionomer cement (Fuji), and to compare shear bond strength between these four types of orthodontic adhesive systems. Materials and Methods: Forty extracted premolars and forty stainless steel mesh edgewise brackets were used. Each type of orthodontic adhesives were used for bonding of ten brackets according to its manufacturer instructions, after setting the brackets were debonded and the shear bond strength were measured using Instron testing machine. Results: Showed that the twopaste composite (Concise) and the lightcured composite (Transbond) gives the highest bond strength, the bond strength of the glass ionomer cement (Fuji) significantly lower than that of Concise and Transbond but it was remained within the accepted level for clinical use, the nomix composite (Alphadent) showed very low shear bond strength which was below the accepted value for clinical application. Conclusions: Concise and Transbond have high bond strength so that it can be used to fix orthodontic attachment in areas subjected to high force. The bond strength of the glass ionomer cement (Fuji) remains within the accepted level for clinical use with the benefit of fluoride release. Also the shear bond strength of the nomix composite (Alphadent) is very low makes it not suitable for clinical use.