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Effect of different disinfectants on the microhardness and roughness of acrylic resins for ocular prosthesis
Amália Moreno1, Marcelo C Goiato, Daniela M dos Santos
1Department of Dental Materials and Prosthodontics, UNESP - Univ Estadual Paulista, Faculty of Dentistry of Araçatuba, University of the State of São Paulo, São Paulo, Brazil.
Background:
Ocular prosthesis materials should have specific properties for their indication and durability; therefore, it is important to investigate their physical behaviour when affected by several disinfectants.
Objectives:
This study evaluated the influence of different disinfecting solutions on the microhardness and surface roughness of acrylic resins for ocular prosthesis.
Materials And Methods:
Fifty samples simulating ocular prostheses were fabricated with N1 resin and colourless resin and divided (n = 10) according to the disinfectant used: neutral soap, Opti-free, Efferdent, 1% hypochlorite (HYC) and 4% chlorhexidine (CHX). Samples were stored in saline solution at 37°C and disinfected during 120 days. Both microhardness and roughness were investigated before, after 60 days and 120 days of disinfection and storage. Microhardness was measured using a microhardner and the roughness with a roughness device.
Results:
N1 resin showed lower microhardness when compared with colourless resin (p < 0.05). HYC and CHX groups exhibited the highest change of microhardness and roughness values (p < 0.05). An increase in roughness and reduction in microhardness of ocular acrylic resins were observed after both periods of disinfection and storage (p < 0.05).
Conclusion:
Both disinfection/storage periods affected the microhardness and roughness values of the samples.
