The Influence Of Dentin Desensitizers On The Bond Strength Of A Bonding Material

Objective: To evaluate the influence of three dentin desensitizers on theshear bond strength of a total-etch adhesive to dentin surfaces.Methods: Eighteen newly extracted human premolars or the third molarsstored in1%chloramine-T were used for research. The roots were abondonedusing the diamond saw, and the residual crown was departed in the buccal andlingual direction. The enamel was abrased using the silicon carbide burs tocreat the dentin adhesive surfaces. The prepared dentin disks were mountedinto self-curing resin，to form cylinder-shaped test specimens which is3mm inthe height and2.5mm in the diameter. Thirty-six specimens were separated intofour groups，treated with Gluma、Pulpdent、Vivasens individually after etching.Z250resin composite cylinders were bonded on the dentin surfaces usingTetric-N Bond adhesive. The specimens were stored in distilled water at37℃of24hours，then the shear bond strengths were measured by using a UniversalTesting Machine at a crosshead speed of0.5mm/min. One-way ANOVA wasused to compare the differences of the values. Scanning electronic microscopeis used to observe the surfaces of the fracture and the surfaces that were coatedby the desensitizers only.Results: The shear bond strength of the Gluma group is higher than that ofthe control group statistically. The shear bond strength of the Pulpdent group isalso higher than that of the control group, the value of the Vivasens group islower than that of the control group, but there’s no statistical significance in thedifferences. Conclusion: The results present that the bond strength can be enhanced bythe Gluma desensitizer,and the Pulpdent and Vivasens don’t influence the bondstrength.