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ORIGINAL ARTICLE
Year : 2006  |  Volume : 6  |  Issue : 3  |  Page : 128-132

Evaluation of surface roughness of glazed and polished ceramic surface on exposure to fluoride gel, bleaching agent and aerated drink: An in vitro study


Department of Prosthodontics, Meenakshi Ammal Dental College, Chennai, India

Correspondence Address:
K R Kamala
Department of Prosthodontics, Meenakshi Ammal Dental College, Allapakkam Main Road, Chennai - 95
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-4052.29363

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STATEMENT OF PROBLEM: The effect of acidic solutions on the surface roughness of ceramic material is not well documented. PURPOSE: Evaluate the surface roughness of three acidic solutions on exposure to two ceramic materials. MATERIALS AND METHODS: About 40 discs (10 mm diameter, 2 mm thick) were made from the following ceramic: low-fusing ceramic (Ivoclar classic) Group A and all ceramic (Ivoclar IPS empress 2) Group B. Each disc abraded with medium-grit diamond on one half of disc and polished with diamond paste while other half retains the glaze. The discs (10 specimens/group) immersed in 1.23% APF Gel, 16% carbamide peroxide, Coca-cola and distilled water (control). The surface roughness evaluated with surface profiler, before and after exposure to acidic solutions followed by SEM analysis. The data analyzed using Student's t -test and Student's independent t -test. Increase in surface roughness was calculated in percentage change. RESULTS: For Group A, Ra values for glazed surface were significantly higher than Ra values before exposure to acidic solutions (1.07 0.17 mm, 1.090.33 mm, 1.29 0.33 mm and P <0.05). For Group B, glazed surface showed higher values after exposure, not at significant level. Polished surfaces had no effect on exposure to acidic solutions. Coca-cola showed higher percentage changes in surface roughness among acidic solutions. SEM showed acidic solutions etched the ceramic surfaces of both materials. CONCLUSION: Polishing ceramic with diamond paste provides smoother surface than glazed surface. Roughening of porcelain may occur following application of fluoride gel, bleaching agent and on exposure to Coca-cola.


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