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Effect of Dental Finishing Instruments on the Surface Roughness of Composite Resins as Elucidated by Atomic Force Microscopy

Published online by Cambridge University Press:  16 September 2008

Ana Carolina Botta ,
Sillas Duarte Jr. ,
Pedro Iris Paulin Filho  and
Simoni Maria Gheno
Ana Carolina Botta
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
Sillas Duarte Jr.*
Affiliation:
Department of Comprehensive Care, Case School of Dental Medicine, Case Western Reserve University, 10900 Cleveland, OH 44106-4905, USA
Pedro Iris Paulin Filho
Affiliation:
Department of Materials Engineering, Federal University of São Carlos, São Carlos, São Paulo, Km 235 Rod Washington Luiz, Postal Code 676, 13565-905, Brazil
Simoni Maria Gheno
Affiliation:
Department of Materials Engineering, Federal University of São Carlos, São Carlos, São Paulo, Km 235 Rod Washington Luiz, Postal Code 676, 13565-905, Brazil
*
Corresponding author. E-mail: sillas.duarte@case.edu
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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-μm 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.

Keywords

atomic force microscopysurface roughnesscarbide burdiamond burnanofiller composite resinmicrohybrid composite resinfinishing techniques
Type
Biological Applications
Information
Microscopy and Microanalysis , Volume 14 , Issue 5 , October 2008 , pp. 380 - 386
Copyright
Copyright © Microscopy Society of America 2008

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