COMPARATIVE EVALUATION OF BOND STRENGTH OF TOTAL ETCH AND SELF ETCH BONDING SYSTEMS TO BLEACHED ANTIOXIDANT TREATED ENAMEL – AN INVITRO STUDY

Dr. Makonahalli Jaganath Bharath, Dr. Chikkhmagravalli Krishnegowda Sahadev, Dr. Rudranaik Sandeep, Dr. Sagar P. Santhosh and *Dr. Raju Maria Roshin

ABSTRACT

Aim: The aim of this study was to evaluate and compare the bond strength of fifth generation bonding agent and eighth generation bonding agent onto bleached enamel and antioxidant treated enamel following in office bleaching. Materials and Methods: 30 human maxillary central incisors will be randomly divided into 3 groups (n=10) Group 1: (control): No bleaching, no antioxidants. Group 2: Bleaching only, no antioxidants Group 3: Bleaching and antioxidant treatment. Each group will be divided into subgroups(n=5) Subgroups A: Bonding done with fifth generation bonding agent(Tetric Econom Bond) Subgroup B: Bonding done with eighth generation bonding agent(Tetric N Bond Universal). Labial surfaces of specimens in group 2 & 3 will be bleached using 35 % hydrogen peroxide gel for 30 mins. The green tea extract antioxidant solution will be applied on the prepared enamel surface in group 3 using an applicator brush. Enamel surfaces of subgroup A will be etched with 37% phosphoric acid (3M ESPE Scotchbond multipurpose) for 15 secs.2-3 generous coats of bonding agent were applied onto all enamel surfaces with a microbrush applicator for 20 seconds, air dried for 5 seconds and light cured for 10 seconds. Composite will be packed into teflon mold, using incremental technique and cured. Each specimen will be loaded in universal testing machine for shear bond strength testing. Results: Data were analysed using Kruskal Wallis tests and Mann Whitney U tests. Significant differences were found between all groups; group 3 showing the highest bond strengths. There were no significant differences between the sub-groups. Clinical Significance: Bond strength of bleached enamel can be improved by antioxidant treatment and newer bonding systems.

Keywords: Bleaching, Antioxidants, Bonding Agents, Green tea extract.