title: In vitro wear of new indirect resin composites.
abstract: This in vitro study evaluated the toothbrush abrasion wear, three-body Alabama wear and two-body pin-on-disc wear of four commercial indirect resin composites. Enamel shades of Radica (R), Sculpture Plus (S), Belleglass-NG (B) and Gradia Indirect (G) were used. For measuring wear due to toothbrush abrasion, six specimens of each group were fabricated, then brushed in a toothbrush abrasion machine for 20,000 cycles. Material loss was determined by weighing and conversion to volume loss. Three-body wear was measured on six samples for each group using an Alabama-type wear testing machine for 400,000 cycles. Wear depth was measured with a contact profilometer. For two-body wear, five disc specimens were prepared and tested in a two-body wear-testing machine against hydroxypatite sliders for 25,000 cycles. Data were analyzed with one-way analysis of variance (ANOVA) and Tukey test (alpha=0.05). Wear was the highest in Sculpture Plus by all three methods tested and the lowest wear was observed in Belleglass-NG. No statistical difference in wear was noted from Radica.
authors.affiliation: Division of Dental Biomaterials, Indiana University School of Dentistry, Indianapolis, IN, USA. dr_vishalj@yahoo.com
authors.forename: V
authors.initials: V
authors.lastname: Jain
authors.forename: J A
authors.initials: JA
authors.lastname: Platt
authors.forename: B K
authors.initials: BK
authors.lastname: Moore
authors.forename: G A
authors.initials: GA
authors.lastname: Borges
mesh_terms: D003188:Composite Resins; D019554:Dental Restoration Wear; D003799:Dental Stress Analysis; D006801:Humans; D066298:In Vitro Techniques; D008689:Methacrylates
chemical_list: D003188:Composite Resins; C470230:Gradia; D008689:Methacrylates; C530343:Radica composite; C110370:belleGlass