Long-Term Surface Hardness and Monomer Conversion of a Nanofilled and a Microhybrid Composite Resin

JOURNAL TITLE: The Journal of Contemporary Dental Practice

Author
1. José Roberto Cury Saad
2. Matheus Coelho Bandéca
3. Fernanda Ferreira Jassé
4. Carlos Henrique Braga Borges
5. Alessandra Nara de Souza Rastelli
6. Mateus Rodrigues Tonetto
7. Vanderlei Salvador Bagnato
8. Reidson Stanley Soares dos Santos
9. Edson Alves de Campos
ISSN
DOI
10.5005/jp-journals-10024-1419
Volume
14
Issue
5
Publishing Year
2013
Pages
7
Author Affiliations
    1. Department of Restorative Dentistry, UNESP Araraquara (FOAr), São Paulo, Brazil
    1. CEUMA University, Av. Josué Montello, n 1. Renascença 65.075-120, São Luis, Brazil
    1. Department of Restorative Dentistry, University of São Paulo State, Araraquara School of Dentistry, 1680 Humaitá St Araraquara, São Paulo, Brazil
    1. Department of Restorative Dentistry, Araraquara School of Dentistry, University of São Paulo State, Araraquara, São Paulo Brazil
    1. Department of Restorative Dentistry, São Paulo State University School of Dentistry, Araraquara, SP, Brazil
    1. Department of Restorative Dentistry, São Paulo State University School of Dentistry, Araraquara, SP, Brazil
    1. Optics Group from Institute of Physics of São Carlos, University of São Paulo, São Carlos, SP, Brazil
    1. Post-Graduation in Dentistry, CEUMA University São Luis, MA, Brazil
  • Article keywords

    Abstract

    Objective

    This study aims to evaluate the degree of conversion (DC) and hydrolytic degradation through the Vickers hardness test (HV) of a nanofilled (FiltekTM Z-250, 3M) and a microhybrid (FiltekTMSupreme-XT, 3M) composite resin.

    Materials and methods

    Eight disk-shaped specimens (4 mm diameter × 2 mm thick, ISO 4049) of each material were prepared for each test. Composites were inserted into single increment in a metallic matrix and light-cured for 40 seconds. VH readings were performed for each specimen at predetermined intervals: immediately after polymerization (control), 1, 2, 3, 7, 14, 21, 30 and 180 days. After curing, initial hardness measurements were performed and the specimens were immersed in artificial saliva at 37°C. For DC (%), specimens were ground, pressed with KBr and analyzed by FT-IR spectrophotometer.

    Results

    Student t-test showed that there was no difference between the resins for DC (p = 0.252). ANOVA analysis revealed that Z-250 VH means were all greater than S-XT, for both top and bottom surfaces, whatever the storage-period in artificial saliva (p < 0.001). After 180 days of storage, the hardness obtained for S-XT was similar with that at the baseline, for both top and bottom surfaces. While for Z-250 hardness was not significantly different from baseline only for top surface, but there was a significant decrease observed in hardness for bottom surface.

    Conclusion

    The materials tested showed no evidence of hydrolytic degradation in a significant way, in a 6-month storagetime in artificial saliva. Nanofilled resin presents a monomer conversion comparable to the conventional microhybrid.

    How to cite this article

    Jassé FF, Borges CHB, Tonetto MR, de Souza Rastelli AN, Bagnato VS, de Campos EA, Bandeca MC, Saad JRC. Long-Term Surface Hardness and Monomer Conversion of a Nanofilled and a Microhybrid Composite Resin. J Contemp Dent Pract 2013;14(5):876-882.

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