IADR Abstract Archives
Novel Ion-releasing Polishing Paste Containing Diamond Abrasive Grains
Objectives: While polishing is indispensable in the composite resin (CR) restoration procedure, it tends to extend to sound tooth structure surrounding the restoration and expose a surface with low acid resistance, causing concern over the risk of secondary caries development in the exposed area. We have developed a new ion-releasing polishing paste containing diamond and Pre-Reacted Glass-ionomer (PRG) technology-based S-PRG filler particles. This study aimed to evaluate polishing performance of the novel polishing paste on CRs, its invasiveness to enamel and dentin, and its ion-releasing ability.
Methods: We prepared a novel polishing paste containing diamond and S-PRG filler (SI-A1603:SI, Shofu). For glossiness evaluation, CR discs with different filler contents prepared were polished with #600-grit SiC paper, followed by SI. Glossiness (at 60°) of polished CRs was measured using a glossmeter. For invasiveness evaluation, bovine tooth segments (enamel/dentin) were polished with #2000-grit SiC paper, followed by SI. Roughness of polished surfaces was measured using a surface roughness tester. For comparison, a diamond polishing paste (Direct Dia paste:DD, Shofu) and a diamond-impregnated rubber polisher (CompoMaster:CM, Shofu) were used. Data were statistically analyzed (ANOVA, Tukey’s). For ion release measurement, SI and distilled water (1:2.5) were mixed, stirred and centrifuged. A supernatant obtained was evaluated for release of multi-ions by the fluoride ion electrode method and ICP-AES.
Results: SI provided significantly higher glossiness and less surface roughness to CRs than DD and CM, regardless of CR types. SI showed release of 6 ions (including fluoride).
Conclusions: SI showed excellent polishing performance on CRs, and was minimally invasive to tooth structure. Additionally, the release of 6 ions (including fluoride) from SI due to the effect of S-PRG filler makes SI a unique ion-releasing polishing material with clinically-useful preventive effects (incl. tooth strengthening, secondary-caries inhibition) induced by ion uptake into teeth.
Methods: We prepared a novel polishing paste containing diamond and S-PRG filler (SI-A1603:SI, Shofu). For glossiness evaluation, CR discs with different filler contents prepared were polished with #600-grit SiC paper, followed by SI. Glossiness (at 60°) of polished CRs was measured using a glossmeter. For invasiveness evaluation, bovine tooth segments (enamel/dentin) were polished with #2000-grit SiC paper, followed by SI. Roughness of polished surfaces was measured using a surface roughness tester. For comparison, a diamond polishing paste (Direct Dia paste:DD, Shofu) and a diamond-impregnated rubber polisher (CompoMaster:CM, Shofu) were used. Data were statistically analyzed (ANOVA, Tukey’s). For ion release measurement, SI and distilled water (1:2.5) were mixed, stirred and centrifuged. A supernatant obtained was evaluated for release of multi-ions by the fluoride ion electrode method and ICP-AES.
Results: SI provided significantly higher glossiness and less surface roughness to CRs than DD and CM, regardless of CR types. SI showed release of 6 ions (including fluoride).
Conclusions: SI showed excellent polishing performance on CRs, and was minimally invasive to tooth structure. Additionally, the release of 6 ions (including fluoride) from SI due to the effect of S-PRG filler makes SI a unique ion-releasing polishing material with clinically-useful preventive effects (incl. tooth strengthening, secondary-caries inhibition) induced by ion uptake into teeth.
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