The effect of surface treatments of tooth on the shear bond strength of direct composite veneers: An in vitro scanning electron microscope study.

Abstract

The bond strength between tooth structure and restorative materials is critical for the long-term success of dental restorations. This study sought to determine how the shear bond strength (SBS) and type of bond breakdown were affected by the inclusion of sandblasting (SB) as a conditioning step before acid etching (AE). A total of 40 extracted human molars were split into two groups at random: intervention (SB followed by AE) and control (AE only). Composite resin cylinders were constructed on the tooth surface following the application of the bonding agent. A universal testing device was used to determine the SBS, and scanning electron microscopy was used to assess the kind of bond failure. In comparison to the control group, the intervention group displayed a significantly higher SBS (P < 0.05). In contrast to the control group, which showed more adhesive failure at the tooth-resin interface, the intervention group also demonstrated a larger percentage of cohesive failure within the composite resin. As an extra conditioning step, AE after SB considerably increased the SBS between tooth structure and composite resin. The fact that the intervention group experienced a higher percentage of cohesive failure shows that this technique could boost the bond's longevity.