Evaluation of the surface hardness of composite resins before and after polishing at different times

Authors

  • Michelle Alexandra Chinelatti University of São Paulo; Ribeirão Preto Dental School; Department of Restorative Dentistry
  • Daniela Thomazatti Chimello University of São Paulo; Ribeirão Preto Dental School; Department of Restorative Dentistry
  • Renata Pereira Ramos University of São Paulo; Ribeirão Preto Dental School; Department of Restorative Dentistry
  • Regina Guenka Palma-Dibb University of São Paulo; Ribeirão Preto Dental School; Department of Restorative Dentistry

DOI:

https://doi.org/10.1590/S1678-77572006000300008

Keywords:

Hardness, Composite resins, Polishing

Abstract

PURPOSE: The aim of this study was to evaluate the surface hardness of six composite resins: Revolution, Natural Flow, Fill Magic Flow, Flow-it! (flowables), Silux Plus (microfilled) and Z100 (minifilled) before and after polishing at different times. MATERIALS AND METHODS: For this purpose, 240 specimens (5mm diameter, 1.4mm high) were prepared. Vickers hardness was determined before and after polishing at different times: immediately, 24h, 7 and 21 days after preparation of the samples. Statistical analysis was performed by ANOVA and Tukey test. RESULTS: There was no difference in the hardness of flowable resins, which had lower hardness than the minifilled resin. The minifilled resin showed the highest surface hardness as compared to the other materials (p<0.01). All materials exhibited higher hardness after polishing, being more evident after 7 days. CONCLUSION: It may be concluded that, regardless of the composite resin, surface hardness was considerably increased when polishing was delayed and performed 1 week after preparation of the samples.

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Published

2006-06-01

Issue

Section

Original Articles

How to Cite

Evaluation of the surface hardness of composite resins before and after polishing at different times . (2006). Journal of Applied Oral Science, 14(3), 188-192. https://doi.org/10.1590/S1678-77572006000300008