Contact Lens & Anterior Eye
Volume 32, Issue 6 , Pages 283-287, December 2009

Effect of weathering and thickness on the superficial microhardness of acrylic resin and ocular button

  • Aline Úrsula Rocha Fernandes

      Affiliations

    • University of Brasília (UnB), Barsília/DF, Brazil
    • ,
  • Marcelo Coelho Goiato

      Affiliations

    • Department of Dentistry Materials and Prosthesis, Faculty of Dentistry of Araçatuba, University of the State of São Paulo, Brazil
    • Corresponding Author InformationCorresponding author at: R-José Bonifácio 1193 - Vila Mendonça, Code: 16015-050, Araçatuba/São Paulo, Brazil. Tel.: +55 18 3636 3287.
    • ,
  • Daniela Micheline dos Santos

      Affiliations

    • UNESP, Araçatuba/SP, University of the State of São Paulo, Brazil

published online 05 October 2009.

Abstract 

Purpose

This study evaluated the effects of weathering (1008h) and thickness (1 and 3.5mm) on the superficial microhardness of the ocular button, using five colorless acrylic resins, and colorless buttons specific for ocular prosthesis.

Materials and methods

One-hundred-and-twenty specimens were made and distributed allocated to 12 groups. Microhardness analysis was carried out with a microdurometer (Shimadzu, Japan) before and after weathering for 1008h. Data were then analyzed statistically by ANOVA and the Tukey Test at 1% significance.

Results

The data demonstrated that the ocular button and the QC 20 resin presented, respectively, the highest (22.9) and lowest (18.31) values of surface microhardness (Knoop), independently of the variable evaluated.

Conclusion

Thickness did not influence the property studied, and the specimens presented higher mean values of superficial microhardness after weathering for 1008h.

Keywords: Aesthetic, Ocular prosthesis, Hardness, Acrylic resin

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PII: S1367-0484(09)00124-6

doi:10.1016/j.clae.2009.09.001

Contact Lens & Anterior Eye
Volume 32, Issue 6 , Pages 283-287, December 2009

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