Effect of different caries removal techniques on shear bond strength of composite resin in primary teeth

At present different techniques are used for the removal of carious lesions. Chemomechanical caries removal technique is a noninvasive technique that removes the infected tissue، and at the same time، maintains sound tooth structures and prevents pulpal irritation and patient discomfort. The aim of this study was to evaluate shear bond strength of a two-step self-etch adhesive to demineralized dentin after caries removal in primary molars with Carisolv in comparison with a handpiece.

In this in vitro study، 60 freshly extracted primary molars with occlusal caries were collected. The samples were divided into two groups. In each group، the teeth were cut in mesiodistal and buccolingual directions to prepare four samples. In group 1، the carious lesions were removed using Carisolv gel and in group 2، they were removed using a bur in a handpiece. Then the teeth were restored with composite resin and Clearfill SE Bond adhesive، using molds measuring 2 mm in height and 1. 4 mm in diameter. The bonding interface underwent a shear strength test in a universal testing machine. Numerical values ​​of shear bond strength (SBS) were calculated for each group، and statistical analysis was performed with t-test using SPSS software program (α = 0. 05).

The mean SBS values of Carisolv and handpiece groups were 19. 7 ± 6. 1 and 17. 3 ± 5. 5 MPa، respectively، with no statistically significant differences between the two techniques (p value = 0. 308).

Based on the results of the present study، the bond strength of Clearfil SE Bond adhesive to dentin after caries removal using the two techniques (Carisolv and handpiece) did not exhibit significant differences.