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Volume 5 Issue 5 (May, 2017)

Original Articles

MODE OF FAILURE OF AMALGAM RESTORATIONS BONDED WITH RESIN ADHESIVE AND LIGHT CURE GLASS IONOMER LINER/BASE - A SEM STUDY
A Devadathan, Jose Jacob, Anna Mariam Simon, Anu Thomas, Narayan A Nair

Objective: The objective of this study was to evaluate using Scanning Electron Microscope, the mode of failure of simulated bonded amalgam restorations in class V cavities, using a resin adhesive, Prime &BondTM 2.0, and  light cure glass ionomer liner/base, VitrebondTM, as the adhesive intermediary. Methodology: Twenty five extracted non carious molars were decoronated at the CEJ and mounted in aluminium tubes using autopolymerizing resin. Standard class V cavities were prepared with 2.5 mm depth and 3 mm width, with slightly divergent lateral walls and randomly divided into three groups. Group A and B, consisting of 10 teeth each, resin adhesive Prime & BondTM 2.0, and  light cure glass ionomer liner/base, VitrebondTM, were used as the adhesive intermediary, respectively, to bond amalgam restorations. Group C, consisting of five teeth, no adhesive intermediary was used and served as control. The specimens were loaded to failure in tension and observed under SEM to evaluate the mode of failure. Results: Group A in which resin adhesive Prime & BondTM2.0 was used as the adhesive intermediary showed adhesive failure at the resin amalgam interface in 80% samples. Group B in which light cure glass ionomer liner/base was used as the adhesive intermediary, showed a cohesive failure within the Vitrebond  in majority(90%) of specimens. Conclusion: The results of the present study show that both, the resin adhesive, Prime & BondTM2.0 and light cure glass ionomer liner/base, Vitrebond, have the potential for being effective amalgam adhesives.
Keywords: Bonded amalgam, resin adhesive, light cure glass, SEM, mode of failure.

 
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