Comparison of Shear Bond Strength and Adhesive Remnant Index of Two Different Orthodontic Bonding Adhesives: An In-Vitro Study

Abstract

Aim: The purpose of this in vitro study was to determine and compare the shear bond strength (SBS)and adhesive remnant index scores (ARI) of stainless-steel brackets bonded with two different orthodontic bonding adhesive systems.

Material and Methods: Human premolar teeth(n=40) extracted for orthodontic reasons were randomly assigned to two groups and bonded using assigned protocols. Group 1(n=20) was Transbond XT Light Cure Adhesive (3M, USA), Group 2(n=20) was FUSION CRYSTA ADHESIVE (PREVEST DenPro). SBS was measured using a universal testing machine. ARI was evaluated after debonding via stereomicroscopy.

Results: The mean SBSs in MPa for two groups were respectively 2.29(+-0.68) MPa and 5.35(+-1.59) MPa. The difference in shear bond strength between two products was statistically significant (p<0.05). There was significant difference observed in ARI of Transbond XT and Fusion Crysta groups (P<0.05). For Fusion Crysta, 60% teeth had ARI score of 3, 30% had a score of 2, and 10% had a score of 1. For Transbond XT, 30% of the teeth had ARI score of 0, another 30% had a score of 1, 10% had a score of 2, and 30% had a score of 3.

Conclusion: Results of the in vitro study suggest that Fusion Crysta exhibits significantly greater shear bond strength compared to Transbond XT, suggesting its superior bonding capabilities. Transbond XT had less adhesive left on the tooth surface compared to Fusion Crysta. Fusion Crysta may be more consistent in leaving adhesive on the tooth after bracket removal, which could be disadvantageous depending on the clinical situation.

KEYWORDS:

SBS, ARI, Fusion Crysta Adhesive, Transbond XT Light Cure Adhesive