The Effect of Repolishing on Surface Roughness of Hybrid Ceramics after Immersion in Mouth Rinse

Abstract

Background: The aim of the study was evaluating the effect of repolishing on surface roughness of hybrid ceramic materials after immersion in Listerine mouth rinse. Methods: Ninety rectangular specimens were cut of CAD\CAM blocks of vita Enamic ,Shofu and Nacera Hybrid using specially cutting saw (Isomet 4000), each specimen was 1mm thickness,14mm length and 14mm width which confirmed with digital caliper for standardization. The specimens divided into (n = 30) for each material then surface roughness measured three times for each one. the first time was the base line measurements, the second time was after immersion in mouth rinse and the third time was after repolishing. Surface roughness measurements were done using non-contact profilometer. Specimens were photographed using USB Digital microscope with a built-in camera connected with compatible personal computer. Quantitative data were expressed as mean and standard deviation using one way analysis of variance followed by Tukey’s post hoc test. Results: The results of the current study showed a significant difference in the Surface roughness measurements values of the three hybrid materials in comparison to its base line values. After immersion in mouth rinse, the highest value was (0.314 ± 0.020) in Shofu HC, while after repolishing the highest value was (0.293 ± 0.016) in Nacera Hybrid. Conclusions: Listerine mouth rinse had the ability to increase the surface roughness of hybrid ceramic materials while re-polishing decreased the surface roughness of hybrid ceramic materials with the least effect on the high resin content materials.