Correlation between water uptake and biaxial flexural strength in restorative composites

Authors

  • Nádia Ozaki Gushiken Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil
  • Nívea Regina Godoy Fróes-Salgado Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil
  • Roberto Ruggiero Braga Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil

DOI:

https://doi.org/10.11606/issn.2357-8041.v20i2p67-73

Keywords:

Materiais Dentários

Abstract

Though aging of resin composites has been the subject of several investigations, the correlation between strength and water uptake has not been established. Therefore, the purpose of the present study was to verify if there was a statistically significant correlation between biaxial flexural strength and weight gain due to water uptake for two commercial restorative composites, one methacrylate-based and one silorane-based. Discs (15 mm in diameter by 1 mm thick) were built with either Filtek Z250 or Filtek Silorane (both from 3M ESPE) and dry stored for 30 days. Then, they were weighted in an analytical balance and immersed in distilled water at 37 oC for 1, 2, 5, 7, 30 or 60 days (n=10). After the immersion period, the discs were re-weighted and immediately fractured on a “piston-on-three-ball” device. Mass gain (in percentage) and biaxial flexural strength data were subjected to two-way ANOVA/Tukey test and Pearson’s correlation analysis (alpha: 5%). Mass gain was similar for both composites in a given storage period, and did not vary significantly between one and seven days. For Filtek Z250, biaxial strength decreased gradually with prolonged immersion, while for Filtek Silorane, it decreased abruptly between 30 and 60 days. Statistically significant correlations were found between strength and mass gain for both composites. However, a stronger correlation was found for Filtek Z250 (r=-0.706, p<0.001) compared to Filtek Silorane (r= - 0.361, p<0.01). Therefore, it was possible to conclude that strength is linearly related to water uptake and this correlation is material-dependent.

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Published

2014-06-26

Issue

Vol. 20 No. 2 (2014)

Section

Original Research

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