title: Effect of dental finishing instruments on the surface roughness of composite resins as elucidated by atomic force microscopy.
abstract: Roughness increases significantly after finishing procedures. The aim of this study was to assess by the atomic force microscope (AFM) the effect of finishing instruments on the surface roughness of composite resins. A nanofiller composite resin (Filtek Supreme, 3M-F) and a microhybrid composite resin (Point 4, Kerr-P) were selected. The finishing procedures were done with a 30-blade carbide bur (C) and a 30-microm finishing diamond bur (D). Standardized specimens were produced and divided into six experimental groups (n=4) according to (1) composite resin, (2) absence of finishing (Mylar matrix-M), and (3) finishing instrument (FM, PM, FC, FD, PC, PD). The mean surface roughness was evaluated by AFM in the contact mode. FM and PM groups were assessed statistically by the Student's T test, and FC, FD, PC, PD groups were submitted to variance analysis (ANOVA), both at 5% significance. The mean surface roughness values, in nanometers, were FM, 23.63 (b); FC, 283.88 (c); FD, 510.55 (d); PM, 12.52 (a); PC, 343.98 (c); PD, 531.64 (d). Microhybrid composite displayed less roughness than nanofiller composite in the absence of finishing procedures. The 30-blade carbide bur produced less roughness compared to the extra fine diamond bur.
authors.affiliation: Department of Restorative Dentistry, São José dos Campos School of Dentistry, São Paulo State University (UNESP), Eng Francisco José Longo, 777, 12245-000, São José dos Campos, São Paulo, Brazil.
authors.forename: Ana Carolina
authors.initials: AC
authors.lastname: Botta
authors.forename: Sillas
authors.initials: S
authors.lastname: Duarte
authors.forename: Pedro Iris
authors.initials: PI
authors.lastname: Paulin Filho
authors.forename: Simoni Maria
authors.initials: SM
authors.lastname: Gheno
mesh_terms: D000180:Acrylic Resins; D003188:Composite Resins; D003775:Dental Polishing / Q000295:instrumentation*; D003793:Dental Restoration, Permanent; D018625:Microscopy, Atomic Force; D011140:Polyurethanes; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes