IADR Abstract Archives
Shear Bond Strengths: Outcomes With Inexperienced vs. Experienced Operators
Objectives: The aim of this study was to investigate shear bond strengths (and failure modes) of three ‘universal’ self-etch and one self-etch bonding agents to bovine dentin and enamel, following adhesive application by inexperienced and experienced operators.
Methods: Experiments were performed by 6 operators who already had experience with the application of bonding agents and who did not receive any additional training and by 60 early-stage University dental students who received precise instructions on how to perform the bonding process immediately before the experiments were done. In total, bond strengths of three self-etch ‘universal’ agents: Scotchbond Universal® (SBU, 3M), Opti BondTM universal (OBU, Kerr) and Prime & Bond active® (PBA, Dentsply-Sirona), and one self-etch bonding agent OptiBondTM XTR (OBXTR, Kerr) were evaluated. All bonding agents were applied in self-etch mode. Composite-cylinders were bonded perpendicularly to bovine dentin and enamel surfaces. Shear-strengths were measured 24 hours post-bonding. Analysis of overall data was made via mixed-model ANOVA.
Results: Dentin bond strengths of SBU, OBXTR and PBA were comparable for both groups of operators while lower values were measured for OBU (p=0.019) for experienced operators (Fig 1). On enamel, bond strengths were comparable only for PBA while lower values were measured for SBU (p=0.041), OBXTR (p=0.029) and OBU (p=0.039) for experienced operators (Fig. 1). For all materials and dental hard tissues means of shear strengths were higher, when experiments were performed by inexperienced operators. For both groups of operators, OBXTR always showed the highest bond strengths, both on enamel and dentin. More cohesive fractures were detected in dentin than in enamel for all materials, regardless of whether the experiments were performed by experienced or inexperienced operators (Fig. 2).
Conclusions: Inexperienced operators who received precise instructions on how to perform the bonding process achieved higher adhesion values with the same materials than experienced experimenters who did not receive special training.
Methods: Experiments were performed by 6 operators who already had experience with the application of bonding agents and who did not receive any additional training and by 60 early-stage University dental students who received precise instructions on how to perform the bonding process immediately before the experiments were done. In total, bond strengths of three self-etch ‘universal’ agents: Scotchbond Universal® (SBU, 3M), Opti BondTM universal (OBU, Kerr) and Prime & Bond active® (PBA, Dentsply-Sirona), and one self-etch bonding agent OptiBondTM XTR (OBXTR, Kerr) were evaluated. All bonding agents were applied in self-etch mode. Composite-cylinders were bonded perpendicularly to bovine dentin and enamel surfaces. Shear-strengths were measured 24 hours post-bonding. Analysis of overall data was made via mixed-model ANOVA.
Results: Dentin bond strengths of SBU, OBXTR and PBA were comparable for both groups of operators while lower values were measured for OBU (p=0.019) for experienced operators (Fig 1). On enamel, bond strengths were comparable only for PBA while lower values were measured for SBU (p=0.041), OBXTR (p=0.029) and OBU (p=0.039) for experienced operators (Fig. 1). For all materials and dental hard tissues means of shear strengths were higher, when experiments were performed by inexperienced operators. For both groups of operators, OBXTR always showed the highest bond strengths, both on enamel and dentin. More cohesive fractures were detected in dentin than in enamel for all materials, regardless of whether the experiments were performed by experienced or inexperienced operators (Fig. 2).
Conclusions: Inexperienced operators who received precise instructions on how to perform the bonding process achieved higher adhesion values with the same materials than experienced experimenters who did not receive special training.
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