IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-7-6-15781 Original Research Paper COMPARISON OF MICROLEAKAGE AND MICROSHEAR BOND STRENGTH OF A LOW SHRINKAGE COMPOSITE VERSUS METHACRYLATE BASED HYBRID COMPOSITE- AN IN VITRO STUDY Anupreeta. A Dr. Dr. Girija S Sajjan Dr. Dr. Ravi Kumar Konagala Dr. June 2018 7 6 01 02 ABSTRACT

 Purpose of the study: was to evaluate and compare, microleakage and micro–shear bond strength of low shrinkage novel composite [Silorane

FiltekTM P90] with that of conventional hybrid composite FILTEKTM Z250.
Methodology: For microleakage evaluation, standardized Class V cavities on extracted premolars were randomly assigned into 2 groups (n=10);
Gruop 1= FILTEKTM P90, Gruop 2= FILTEKTM Z250. Restored specimens were thermocycled and subjected to methylene blue dye penetration
following which, they were sectioned. microleakage was evaluated steromicroscopically and data was statistically analyzed using the Mann
whitney test. For micro–shear bond strength test, flat dentinal surface of 2 test groups(n=10) specimens were restored to create microcylinders and
were then subjected to micro–shear bond strength test at cross–head speed of 0.5 mm /min. The results were statistically analysed using Unpaired t
test.
Results: Group1 exhibited significantly decreased microleakage at cemental margin, as compared to Group 2. At enamel margin, there was no
statistical significance. In terms of overall microleakage, Silorane showed statistically significant lower values. The micro–shear bond strength of
Group1, was significantly higher, compared to Group 2.
Conclusion: Silorane composite FiltekTM P90 showed decreased microleakage and higher bond strength than FiltekTM Z250.