| ORIGINAL ARTICLE |
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| Year : 2015 | Volume
: 18
| Issue : 6 | Page : 483-487 |
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In vitro evaluation of the effect of different polishing techniques on the surface roughness of composite resins submitted to at-home and in-office bleaching procedures
Michele de Oliveira Lima1, Anderson Catelan1, Natália Maria Pinto Hernandes1, Maria Cecília Caldas Giorgi1, Gláucia Maria Bovi Ambrosano2, Débora Alves Nunes Leite Lima1
1 Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil
2 Department of Social Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil
Correspondence Address:
Dr. Anderson Catelan
Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Av. Limeira, 901, Areião, PO Box 52, 13414-903 Piracicaba, São Paulo
Brazil
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/0972-0707.168820
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Objective: Bleaching agents may affect the properties of dental materials. The aim of this study was to evaluate the effect of different polishing techniques on the surface roughness of composite resins submitted to the at-home and in-office bleaching treatment.
Materials and Methods: Disc-shaped specimens were carried out of nanofilled and microhybrid composites (n = 10). Finishing step was performed after light curing (L1) and polishing after 24 h with two systems (L2). Then, specimens were submitted to the home or in-office bleaching procedures, and roughness was re-evaluated (L3). The surface roughness (Ra) readings were measured at L1, L2, and L3 times using a profilometer. Data were statistically analyzed by multiple-way analysis of variance and Tukey test (α = 0.05).
Results: The polishing procedures decreased Ra for both composites compared to baseline values (L1). The roughness of specimens polished with jiffy did not present significant difference after polishing step (L2) and bleaching treatment (L3). However, the groups polished with Sof-Lex discs had increase on the Ra values after bleaching.
Conclusion: The polishing is an important procedure to reduce the roughness of dental restorations and composite surface polished with jiffy system improved the degradation resistance to the bleaching agents compared to Sof-Lex discs. |
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