Influence of Chemical Degradation and Toothbrushing on Surface of Composites

JOURNAL TITLE: World Journal of Dentistry

Author
1. Carlos Rocha Gomes Torres
2. Tânia Mara Da Silva
3. Alessandra Buhler Borges
4. Ana Luísa Leme Simões Sales
5. Cesar Rogério Pucci
ISSN
0976-6006
DOI
10.5005/jp-journals-10015-1316
Volume
6
Issue
2
Publishing Year
2015
Pages
6
Author Affiliations
    1. Department of Restorative Dentistry, São José dos Campos School of Dentistry, São Paulo State University, São Paulo, Brazil
    1. Department of Restorative Dentistry, São José dos Campos School of Dentistry, São Paulo State University, São Paulo, Brazil
    1. Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University, São Paulo, Brazil
    1. Department of Restorative Dentistry, Institute of Science and Technology, Universidade Estadual Paulista, São Paulo, Brazil
    1. Department of Restorative Dentistry, Institute of Science and Technology, Universidade Estadual Paulista, São Paulo, Brazil
  • Article keywords

    Abstract

    Objective

    The aim of this study was to evaluate the effect of chemical degradation media associated with brushing on surface roughness (Ra) and Knoop microhardness (KHN) analyses of different composites.

    Materials and methods

    Eighty specimens were prepared for each composite: GrandioSO (Voco), Amaris (Voco), Filtek Supreme (3M ESPE), Filtek LS (3M ESPE). The specimens were divided into four groups according to the immersion in chemical degradation media for 7 days: artificial saliva (control), heptane, 0.02 M citric acid, 70% ethanol. The surface of specimens was submitted to 10950 brushing cycles (200 gm load) in an automatic toothbrushing machine with abrasive slurry. Surface roughness and microhardness measurements were obtained at baseline, after immersion in chemical degradation media and after brushing. Data were submitted to three-way repeated measures ANOVA and Tukey's test (p < 0.05).

    Results

    The KHN means for composites were: Grandio (153.5 ± 35.9)a, Filtek Supreme (87.0 ± 24.9)b, Amaris (64.5 ± 24.5)c, LS (69.0 ± 15.3)c; for storage media: artificial saliva (97.3 ± 46.7)a, ethanol (93.3 ± 49.9)a, citric acid (95.8 ± 42.1)a, heptane (87.6 ± 36.7)b; and after treatments: after chemical degradation (104.8 ± 49.7)a, baseline (93.8 ± 42.5)b, after brushing (81.9 ± 36.5)c. The Ra results for composites were: LS (0.15 ± 0.25)a, GrandioSO (0.19 ± 0.24)ab, Filtek Supreme (0.20 ± 0.22)ab, Amaris (0.23 ± 0.37)b; for storage media: artificial saliva (0.18 ± 0.31)a, heptane (0.18 ± 0.25)a, ethanol (0.20 ± 0.26)a, citric acid (0.21 ± 0.28)a, and after treatments: brushing (0.11 ± 0.14)a, after chemical degradation (0.23 ± 0.32)b, baseline (0.24 ± 0.32)b.

    Conclusion

    Brushing after chemical degradation reduced surface roughness values. In general, chemical degradation did not affect composites roughness, but microhardness was significantly reduced. Heptane produced the biggest reduction in composites microhardness.

    Clinical relevance

    The food-simulating solutions and brushing simulating alter the composites properties, and these alterations are material-dependent.

    How to cite this article

    Torres CRG, Da Silva TM, Sales ALLS, Pucci CR, Borges AB. Influence of Chemical Degradation and Toothbrushing on Surface of Composites. World J Dent 2015;6(2):65-70.

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