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Harsukh Educational Charitable Society International Journal of Community Health and Medical Research

Volume 6 Issue 1 Jan-March 2020

Original Articles

Assessment of shear bond strength of composite resin to dentin, using newer dentin bonding agents: A comparative study
Narendeep Ashutosh, Tanuj Singh

Background: To incorporate or remove the smear layer in this interdiffusion zone, different adhesion strategies are followed to obtain a resin-dentin bond. These newer bonding agents reduce the clinical steps, can be placed inexpensively, provide adequate bonding to enamel and dentin, and, most importantly, ensure post-operative comfort for patients. Hence; the present study was undertaken for assessing shear bond strength of composite resin to dentin, using newer dentin bonding agents. Materials & methods: A total of 60 freshly extracted maxillary premolars were obtained and were out in normal saline for 24 hours. On a water-trimmer, occlusal surface of all the tooth specimens was grounded and was made flat upto a depth of 1.5 mm from the cuspal tip. All the specimens were broadly divided into three study groups depending upon the type of bonding agent as follows: Group A: Prime and Bond NT (Control Group) Total etch Self-Priming, Group B - Clearfil S3: One-step self-etch, and Group C - Clearfil Protect Bond: Two-step self-etch. Material was placed using a Teflon mold followed by curing for twenty seconds in all the tooth specimens. This was followed by mounting of the prepared specimen on metal cylinders. Transferring of all the specimens was done to universal force testing machine was shear bond strength was assessed. Results: mean shear bond strength among specimens of group A, group B and group C was found to be 25.13, 21.73 and 15.38 MPa respectively. While making intragroup comparison, significant results were obtained. Increasing order of shear bond strength among different study groups was found as follows: Group A > Group B > Group C. Conclusion: Shear bond strength was highest for total etch Self-Priming and lowest for two-step self-etch. Key words: Shear bond strength, bonding agents

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