Journal of Conservative Dentistry
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Year : 2007  |  Volume : 10  |  Issue : 1  |  Page : 26-32

Effect of Rewetting agents on the shear bond strength of different bonding agents when applied on dry dentin

Department of Conservative and Endodontics, College of Dental Sciences, Davangere - Karnataka, India

Correspondence Address:
Abhishek Bansal
Department of Conservative and Endodontics, College of Dental Sciences, Davangere - Karnataka
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0707.42277

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Background and Objectives: The objective of this study was to compare shear bond strength of the three bonding agents containing different concentrations of water when applied over the etched dentin surfaces under different conditions like dry, wet (control subgroup) or dry and rewetted with different rewetting agents like Aqua Prep and Gluma desensitizer. Methods: The study samples comprised of the buccal and lingual surfaces of 60 extracted human molars that were ground to expose the dentin. The teeth were randomly assigned to three groups depending upon the different bonding agents (Multipurpose Scotch bond, Single Bond, Prime and Bond NT)­Further each group was divided into four subgroups depending upon the different etched dentin surface conditions i.e. dry, wet (control subgroup), dry and rewetted with different rewetting agents that received the following treatment. In all the three groups, the dentin surface was etched with 35% phosphoric acid for 15 seconds and the treated surface was rinsed thoroughly with water followed by the application of respective bonding agents according to manufacturers instructions and light cured under different etched dentin surface condition like dry, wet or dry and rewetted with aquaprep and Gluma desensitizer. Each major group was further divided into 4 subgroups of 10 samples each depending upon different etched dentin surface conditions. The specimens were stored in distilled water at 37 o C for 24 hours and the shear bond strength was tested by lowering the knife edge chisel at a cross head speed of l mm/minute. The data was analysed with One way ANOVA test and post hoc Tukey test. Results: The highest mean shear bond strengths were obtained (in order) on dentin that was re-wetted with Gluma desensitizer, rewetted with Aquaprep or in wet dentin substrate condition, differences between these surface conditions were not statistically significant for either material. Interpretation and Conclusion: The use of dentin bonding agents containing different percentage of water should be considered according to different dentin substrate conditions i.e. dry or wet. Use of rewetting agents may be beneficial when dentin was over dried after acid etching and rinsing, and when less percentage of water concentration dentin bonding is used in such situation.

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