학술논문
Longitudinal evaluation of simulated toothbrushing on the roughness and optical stability of microfilled, microhybrid and nanofilled resin-based composites.
Document Type
Academic Journal
Author
da Silva EM; Analitical Laboratory of Restorative Biomaterials - LABiom-R, School of Dentistry, Federal Fluminense University, Niterói, Rio de Janeiro, Brazil. Electronic address: emsilva@vm.uff.br.; Dória J; da Silva Jde J; Santos GV; Guimarães JG; Poskus LT
Source
Publisher: Elsevier Country of Publication: England NLM ID: 0354422 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-176X (Electronic) Linking ISSN: 03005712 NLM ISO Abbreviation: J Dent Subsets: MEDLINE
Subject
Language
English
Abstract
Objectives: The aim of this study was to evaluate the influence of simulated toothbrushing over ten weeks on the roughness and optical stability (colour, translucency and gloss) of microfilled - Mf (Durafil VS), microhybrid - Mh (Empress Direct) and nanofilled - Nf (Z 350) resin-based composites (RBC).
Methods: The roughness, colour, translucency and gloss of each RBC were measured before and after storage in distilled water (DW) and propionic acid (PA) for ten weeks. The specimens were removed from the media each week, submitted to toothbrushing simulation and the properties measured. The obtained data were analyzed using a multifactor analysis of variance (MANOVA) and Tukey's HSD test (α=0.05).
Results: The roughness significantly increased after ten weeks for the three RBCs (p<0.05), with the final values of roughness presenting no statistical differences among them (p>0.05). Only Mf and Nf immersed in DW and Mh immersed in PA presented a change in colour after ten weeks (p<0.05), although the change in colour was lower after immersion in PA for the three RBCs (p<0.05). None of the RBCs presented significant changes in translucency after ten weeks (p>0.05). Only Mh immersed in DW presented gloss stability after ten weeks (p>0.05).
Conclusions: Toothbrushing increased the roughness and diminished the gloss of the three RBCs. The translucency was not influenced by the toothbrushing. The immersion in propionic acid produced lower alterations in colour than did immersion in distilled water.
Clinical Significance: In general, the three RBCs presented similar optical behaviours after toothbrushing over ten weeks. Thus, it is possible that anterior restorations produced with these materials will not present perceptible differences over time.
(Copyright © 2013 Elsevier Ltd. All rights reserved.)
Methods: The roughness, colour, translucency and gloss of each RBC were measured before and after storage in distilled water (DW) and propionic acid (PA) for ten weeks. The specimens were removed from the media each week, submitted to toothbrushing simulation and the properties measured. The obtained data were analyzed using a multifactor analysis of variance (MANOVA) and Tukey's HSD test (α=0.05).
Results: The roughness significantly increased after ten weeks for the three RBCs (p<0.05), with the final values of roughness presenting no statistical differences among them (p>0.05). Only Mf and Nf immersed in DW and Mh immersed in PA presented a change in colour after ten weeks (p<0.05), although the change in colour was lower after immersion in PA for the three RBCs (p<0.05). None of the RBCs presented significant changes in translucency after ten weeks (p>0.05). Only Mh immersed in DW presented gloss stability after ten weeks (p>0.05).
Conclusions: Toothbrushing increased the roughness and diminished the gloss of the three RBCs. The translucency was not influenced by the toothbrushing. The immersion in propionic acid produced lower alterations in colour than did immersion in distilled water.
Clinical Significance: In general, the three RBCs presented similar optical behaviours after toothbrushing over ten weeks. Thus, it is possible that anterior restorations produced with these materials will not present perceptible differences over time.
(Copyright © 2013 Elsevier Ltd. All rights reserved.)