The Study of Rice Gel as Bleaching Carrier on Microhardness and Roughness of Human Tooth
Objectives: The purpose of this study was to compare the effects of rice gel with bleaching agents and commercial bleaching gels on human tooth roughness and microhardness. The purpose of this study was to investigate the effects of rice gel with bleaching agents on human tooth roughness and microhardness compared with commercial bleaching gels.
Methods: Eighty four human tooth samples were prepared and randomly divided in to 7 groups (N=12). The samples were bleached with 7 gels as follow : 1) 10% rice gel with bleaching agents 2) 10% commercial bleaching gel 3) 20% rice gel with bleaching agents 4) 20% commercial bleaching gel 5) 35% commercial bleaching gel as a positive control 6) rice gel as a negative control 7) artificial saliva as a placebo. Surface roughness, Vicker’s microhardness and Scanning electron microscopy were tested. The average of surface roughness and Vicker’s microhardness were compared using the One-way ANOVA test (p<0.05).
Results: No significant differences in surface roughness and Vicker’s microhardness among the groups was found. For surface morphology of the commercial bleaching gels (Groups 2, 4 and 5), the enamel surface textures showed partially-etched surfaces with many shallow depressions, whereas the surface morphology of the rice gels with bleaching agents (Groups 1 and 3), the rice gel (Group 6) and the artificial saliva (Group 7) showed smooth and clear surfaces.
Conclusions: No Significant differences in surface roughness and Vicker’s microhardness on human tooth was found between rice gel with bleaching agents and commercial bleaching gels.
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