The Influence of Different Polishing Systems on the Surface Roughness and Microhardness of Nanocomposites after Exposure to Acid Drink
Journal Title: Journal of Advances in Medicine and Medical Research - Year 2017, Vol 20, Issue 8
Abstract
Aims: This in vitro study evaluated the surface roughness and microhardness of nanocomposites, after storage in acid solution for three months, with different techniques polishing systems. Study Design: In vitro study. Place and Duration of Study: Department of Restorative Dentistry, School of Dentistry, State University of Western Parana (UNIOESTE), Cascavel, Parana, Brazil, between June, and October, 2014. Methodology: A total of 280 specimens (4-mm in diameter, 2 mm thick) were fabricated for both tests (n=140 each test) in a plexiglass mold covered with a Mylar strip. After polymerization, specimens were divided into seven groups (n=20) according to the technique polishing systems: G1 – control group (no polishing treatment); G2 - Soft-Lex Discs; G3 - Diamont Master Discs; G4 - Po Go; G5 – Flexi discs; G6 – Enhance; G7 – Felt disks associated with diamond paste. All polishing systems were applied according to the manufacturers’ instructions. The specimens were randomly divided into two groups according to the storage solution: a) distilled water and b) Coca-Cola classic, for a period of three months at 37°C. The surface roughness values were determined using a roughness test (initially and after three months). The microhardness measurements were performed using a digital microhardness tester (initially and after three months). The mean Ra and microhardness values were submitted to the LS means analysis and Tukey-Kramer test of 5%. Results: There were no statistically significant differences between polishing systems in the roughness and microhardness of nanocomposites (p<0,05). The solution of Coca-Cola led to higher values of reduced surface roughness and microhardness values after 3 months of storage. Conclusion: All polishing systems may be successfully used for polishing nanocomposites.
Authors and Affiliations
Bruna C. O. Lima, Carlize Vincenzi, Juliana Royer Heidmann, Glaucia M. B. Ambrosano, Virgínia Bosquiroli, Márcio J. Mendonça, Veridiana Camilotti
Keywords
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- EP ID EP311447
- DOI 10.9734/BJMMR/2017/30988
- Views 92
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