| 3121 Roughness and Gloss of Three Composites After Polishing and Aging | ||
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J.L. CHAPMAN1, J.O. BURGESS2, and D.E. MERCANTE2, 1Louisiana State University, Health Sciences Center School of Dentistry, New Orleans, USA, 2Louisiana State University, New Orleans, USA Objectives: This study examined the roughness and gloss, before and after aging, of three composite-resins polished with six different polishing systems. Methods: The polishing kits evaluated were Sof-lex, PoGo, Astropol, Fini, Jiffy, and Kenda. The composites studied were Filtek Supreme (a nanocomposite), EsthetX (a microhybrid), and Vitalescence (a microhybrid). Surface characteristics of materials cured against Mylar matrix were used as the control (n=5). The surface roughness average (Ra microns) and gloss (1-100 gloss units) were measured by profilometer (Talyscan 150 [Taylor Hobson Precision]) and gloss-meter (Novo-Curve [Rhopoint Instrumentation Ltd]), respectively. 30 disc-shaped specimens of each composite (n=5) were fabricated and ground with 350-grit paper. Each group was polished with one of the six polishing systems. The Ra and gloss values of each material and polishing system were measured, averaged, and recorded. These measured specimens were artificially aged by storing them in a 2:1 acetone-water solution (24 hours, room temperature). Ra and gloss values were measured again on the aged specimens and recorded to determine the effect of aging in an organic solvent. Roughness and gloss were statistically analyzed (p<0.05 significance level) with multivariate repeated measure ANOVA models intended to determine relationships among composite, polishing system, and aging. Results: Mylar and Pogo produced the smoothest surfaces, with no significant differences among the composites. Roughness significantly increased after aging. Gloss was higher with Filtek Supreme. Mylar, Sof-lex, and PoGo produced higher gloss. Gloss decreased after aging, but Filtek Supreme decreased to a lesser extent and maintained more gloss. Conclusions: Aging significantly increased the roughness (p<0.0001) and decreased the gloss (p<0.0001). The polishing system significantly affected roughness (p<0.0001), and the composite resin was a significant factor for gloss (p<0.0001). Curing Filtek Supreme against Mylar matrix and polishing with PoGo or Sof-lex generally produced the most desired results. | ||
| Seq #338 - Special Topics 2:00 PM-4:00 PM, Saturday, 12 March 2005 Baltimore Convention Center Exhibit Hall E-F | ||
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