Abstract
Aim: The aim of the study was to evaluate the shear bond strength of composite to dentin with 2 different dentin bonding agents after dry dentin is rewetted with a desensitizer.
 Materials and Methods: Sixty human mandibular molars were taken and the occlusal surface was ground to expose flat dentinal surface. The samples were divided into two major groups Group I and Group II based on the bonding agent used. In Group I Gluma Bond5 was used and in Group II Adper Single Bond 2 was used. Each major group is subdivided into three subgroups a, b and c with ten samples each. Sub Group ‘a’ is moist dentin group. Sub Group ‘b’ is dry dentin group, Sub Group ‘c’ is rewetted dentin group. The desensitizer used is GLUMA Desensitizer. All these samples were thermocycled and the shear bond test was performed using Instron Universal Testing Machine.
 Results: Dry dentin rewetted with GLUMA Desensitizer followed by GLUMA Bond5 showed highest shear bond strength than that of other subgroups. The data was analysed using ANOVA and Tukeys honestly significant test.
 Conclusion: Desensitizer used as a rewetting agent increases the shear bond strength of composite on dry dentin.
 Keywords: Glutaraldehyde, rewetting.
Highlights
Adhesive dentistry has been replacing conventional dental amalgam because of its high aesthetic property, minimal tooth preparation and satisfactory longevity during function and it helps evade mercury toxicity inherent with dental amalgam
The samples were divided into two major groups Group I and Group II based on the bonding agent used
Dry dentin rewetted with GLUMA Desensitizer followed by GLUMA Bond5 showed highest shear bond strength than that of other subgroups
Summary
Adhesive dentistry has been replacing conventional dental amalgam because of its high aesthetic property, minimal tooth preparation and satisfactory longevity during function and it helps evade mercury toxicity inherent with dental amalgam. The bonding resin penetrates the exposed enamel rods and retains the composite to the enamel. The use of air syringe to dry enamel desiccates the dentin with resultant collapse of the weak dentinal collagen scaffold. This affects the penetration of bonding resin to achieve hybridization and bonding. Water chasing bonding agents are introduced that would displace the moisture and establish satisfactory penetration into the enamel and dentin for retention. Even remnant water can be one of the cause for postoperative sensitivity often encountered with resin composite restoration.[7] To preserve collagen as well as to avoid or minimise postoperative sensitivity, a balanced application of rewetting agents are used on the dry dentin. The purpose of this study was to evaluate the shear bond strength of a selected composite to dentin rewetted with the selected desensitizer and when used with two different dentin bonding agents
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