Effect of Various Toothpaste Tablets on Gloss and Surface Roughness of Resin-based Composite Materials
To evaluate the effect of various toothpaste tablets on gloss and surface roughness of resin-based composite. Sixty-four resin-based composite specimens were divided into four groups of 16 specimens each. Gloss and roughness were measured before and after simulated brushing with three types of toothpaste tablets and one conventional toothpaste: CT: Chewtab Toothpaste Tablets; AT: Anticavity Toothpaste Tablets; HC: Charcoal Toothpaste Tablets; CP: Cavity Protection toothpaste. The Kruskal-– Wallis procedure was performed to compare the differences by groups. Post-hoc comparisons were conducted with Bonferroni corrections (α=0.05). There was a significant drop in gloss for all groups. CT and AT maintained the highest gloss with means of 81.6 GU and 74.1 GU, respectively. The lowest gloss of 24.5 GU was observed for HC. There was a significant increase in roughness for all groups except for CT. CT had the lowest roughness with a mean of 0.034 μm, while HC had the highest roughness with a mean of 0.074 μm. There was a significant correlation between post-brushing gloss and post-brushing roughness (p<0.001, r=-0.884). Chewtab Toothpaste Tablets had the least effect on gloss and roughness, while Charcoal Toothpaste Tablets had the most negative effect on the surface properties of resin-based composites.SUMMARY
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Step-by-step experimental protocol. a) Rectangular jigs of 11×12×18 mm3 including wells (2 mm depth and 7 mm diameter) were designed and printed. b) The wells were filled with nanohybrid composite and light-cured. c) Gloss was measured using a small-area glossometer. d) Surface roughness was measured using a contact-type profilometer. e) All specimens were challenged with respective toothpaste and an automated toothbrushing machine. f) Selected specimens were imaged with atomic force microscopy.
Correlation between gloss and roughness at post-brushing.
Atomic force microscopy images by group. The automated brushing caused the loss of resin between and around the particles, leading to protruding filler particles that appear as bumps. Craters were visible in all groups representing areas where the entire filler particle was plucked from the surface.
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