Purpose: To evaluate shear bond strength of a new adhesive restorative material in primary molars in comparison with hybrid composite with universal bond.
Materials and Methods: The study was conducted on twenty teeth categorized into group A: 10 teeth restored with self-adhesive bulk fill composite, while group B: 10 teeth restored with bulk fill resin composite with universal adhesive. The labial surface of twenty mandibular Es were cut to expose a flat surface of dentine. The plastic mold with a central cylindrical cavity was adapted on the buccal surface of the specimen and the restorative materials were placed within the cavity, according to the manufacturers' instructions. All samples were individually and horizontally mounted on a computer-controlled testing machine. The test was done by a compressive mode of load applied at a tooth- resin interface using a mono-beveled chisel until fracture. After debonding, the shear bond strength was registered in MPa.
Results: The independent t-test was used to compare between groups. Shear bond strength of self-adhesive bulk-fill composite was lower than bulk fill composite after applying the adhesive. The mean value was 4.53±1.41 MPa ranged from 2.81 to 6.69 MPa as compared to 1.87±0.94 MPa ranged from 0.75 to 3.60 MPa among bulk fill composite and self-adhesive bulk fill composite groups, P value ≤0.001.
Conclusion: Shear bond strength of self-adhesive bulk-fill composite is significantly lower in than bulk fill composite with a universal adhesive.