Radiant exposure effects on physical properties of methacrylate - and silorane-composites

Authors

  • Anderson Catelan Universidade Estadual de Campinas - UNICAMP
  • Yoshio Kawano Universidade de São Paulo - USP
  • Paulo Henrique dos Santos Universidade Estadual Paulista - UNESP
  • Gláucia Maria Bovi Ambrosano Universidade Estadual de Campinas - UNICAMP
  • Ana Karina Bedran-Russo University of Illinois at Chicago
  • Flávio Henrique Baggio Aguiar Universidade Estadual de Campinas - UNICAMP

DOI:

https://doi.org/10.20396/bjos.v13i3.8640882

Keywords:

Composite resins, Polymerization, Physical properties

Abstract

Aim: To evaluate the effect of different radiant exposures on the degree of conversion (DC), Knoop hardness number (KHN), plasticization (P), water sorption (WS), and solubility (S) of different monomer resin-based composites. Methods: Circular specimens (5 x 2 mm) were manufactured from methacrylate and silorane composite resins, and light-cured at 19.8, 27.8, 39.6, and 55.6 J/cm2 , using second-generation LED at 1,390 mW/cm2 . After 24 h, DC was obtained using a FT-Raman spectrometer equipped with a Nd:YAG laser, KHN was measured with 50-g load for 15 s, and P was evaluated on the top and bottom surfaces by the percentage of hardness reduction after 24 h immersed in absolute alcohol. WS and S were determined according to ISO 4049. Data were subjected to statistical analysis (α=0.05). Results: Methacrylate material presented higher DC, KHN, P, and WS than silorane (p<0.05). There was no difference in the S values (p>0.05). The increased radiant exposures improved only the KHN (p<0.05). In general, top surfaces showed higher DC and KHN than bottom, for both materials (p<0.05). The increase of the radiant exposure did not improve most physical properties of the composites and were monomerbase dependent. Conclusions: Chemical composition of the composite resins resulted in different physical properties behavior and could affect the clinical longevity of dental restorations, but overall these properties were not influenced by the different radiant exposures evaluated in the study.

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Author Biographies

Anderson Catelan, Universidade Estadual de Campinas - UNICAMP

Universidade Estadual de Campinas - UNICAMP, Piracicaba Dental School, Department of Restorative Dentistry, Piracicaba, SP.

Yoshio Kawano, Universidade de São Paulo - USP

Universidade de São Paulo - USP, Institute of Chemistry, Department of Fundamental Chemistry, São Paulo, SP.

Paulo Henrique dos Santos, Universidade Estadual Paulista - UNESP

Universidade Estadual Paulista - UNESP, Araçatuba Dental School, Department of Dental Materials and Prosthodontics, Araçatuba, SP.

Gláucia Maria Bovi Ambrosano, Universidade Estadual de Campinas - UNICAMP

Universidade Estadual de Campinas - UNICAMP, Piracicaba Dental School, Department of Social Dentistry, Area of Statistics, Piracicaba, SP.

Ana Karina Bedran-Russo, University of Illinois at Chicago

University of Illinois at Chicago, College of Dentistry, Department of Restorative Dentistry, Chicago, IL, USA.

Flávio Henrique Baggio Aguiar, Universidade Estadual de Campinas - UNICAMP

Universidade Estadual de Campinas - UNICAMP, Piracicaba Dental School, Department of Restorative Dentistry, Piracicaba, SP.

Published

2010-12-30

How to Cite

1.
Catelan A, Kawano Y, Santos PH dos, Ambrosano GMB, Bedran-Russo AK, Aguiar FHB. Radiant exposure effects on physical properties of methacrylate - and silorane-composites. Braz. J. Oral Sci. [Internet]. 2010 Dec. 30 [cited 2022 Oct. 2];13(3):168-74. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8640882

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