Effect of Carisolv treated dentin on bond strength to GICs

Objective: To determine the effect of Carisolv™ on shear bond strength (SBS) of restorative conventional and resin modified glass ionomer cement bonded to human permanent dentine. Methods: Fuji IX (GC) and Fuji II LC Improved (GC) were tested. Sixty-four sound human molars were sectioned occlusally; exposed superficial coronal dentine was polished with p-600 grit silicon carbide abrasive papers. For test groups, the polished dentine surface was pretreated with Carisolv™ (Medi Team) prior to bonding to GICs. Bonded specimens were stored at 37 °C for 24 hours and stressed to failure in the shear mode. Failure modes were identified with a Stereoscopic Microscope. Each type of failure mode was further examined under a Scanning Electron Microscope. To evaluate the adaptation of GICs to underlying dentine surfaces, one additional specimen was prepared and sectioned through the centre. Sectioned specimens were analyzed using a Backscattered Electron imaging mode. Data was analysed with student t-test. Results: SBS of Fuji IX, T (4.97 ± 0.82 MPa) was significantly higher (P = .001) than Fuji IX, C (3.98 ± 0.67 MPa). No significant difference (P = .160) was observed in SBS with Fuji II LC specimens treated and non-treated with Carisolv™ (13.52 ± 1.88 MPa versus 12.23 ± 2.89 MPa). The predominant failure mode observed was cohesive failure within the cement. SEM examination showed that both Fuji IX and Fuji II LC specimens had smooth and even cement-dentine interface. Conclusion: Carisolv™ pretreatment did not adversely affect the bond strength of conventional and resin modified glass ionomer cements to dentine. This study was supported by Universiti Malaya Vote F 0153/2005A.