Effects of delayed application of bonding agents on shear bond strength-an In Vitro study Dr. Singh Bhawanpreet*, Dr. Kaur Harmanpreet**, Dr. Sharma Anshu*** *Reader, Department of Conservative Dentistry and Endodontics, Maharaja Ganga Singh Dental College and Research centre, Sriganganagar **Reader, Department of Periodontology, Maharaja Ganga Singh Dental College and Research centre, Sriganganagar ***Senior lecturer, Department of Pedodontics and Preventive Dentistry, Teerthanker Mahaveer Dental College and Research Centre, Moradabad Address For Correspondence: Dr Anshu Sharma, Assistant Professor, Department of Pedodontics and Preventive Dentistry, Teerthanker Mahaveer Dental College and Research Centre, Moradabad-244001 Uttar Pradesh, Cell: +91-9634143976, Email: dranshul@hotmail.com
Online published on 19 April, 2013. Abstract Background and Objectives Most of one bottle adhesives contains organic solvents acetone or ethanol that displaces the water entrapped within the network of collagen fibers in etched dentin but acetone and ethanol are volatile substances that could evaporate easily after exposure to environment for certain amount of time. The objective of this study is to compare shear bond strength of dentin when few fifth generation dentin bonding agents were applied immediately after dispensing and allowed to evaporate for 10 minutes prior to their application. Methodology 80 specimens were obtained from 40 experimental teeth by sectioning 1 mm below DEJ and then were mounted in block of polyester resin. Specimens were divided into 8 groups of 10 each. Group 1, 3, 5 and 7 were control groups in which respective adhesives were applied immediately after dispensing. Group 2, 4, 6 and 8 were experimental groups in which respective adhesives were allowed to evaporate for 10 minutes and then applied. Specimens were immersed in water for 24 hours. The shear bond strength was then tested by Hounsfield Universal Testing machine. Results On comparison between control and experimental groups. All control groups showed higher bond strength values than all experimental groups Conclusion Solvents like acetone and ethanol are naturally volatile and their concentration in one bottle adhesives may decrease with time thus compromising adhesion therefore efforts should be made to minimize solvent loss during clinical application by immediately and securely replacing the cap and lids in solvent based adhesives. Top Keywords Acetone, Ethanol, Water, Evaporation, Vapor Pressure. Top |