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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of repeated cycles of chemical disinfection on the roughness and hardness of hard reline acrylic resins

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Author(s):
Pinto, Luciana de Rezende [1] ; Rodriguez Acosta, Emilio Jose T. [1] ; Fernandes Tavora, Flora Freitas [1] ; Batista da Silva, Paulo Mauricio [1] ; Porto, Vinicius Carvalho [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Bauru Sch Dent, Dept Prosthodont, Bauru, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: GERODONTOLOGY; v. 27, n. 2, p. 147-153, JUN 2010.
Web of Science Citations: 25
Abstract

Objective: The aim of this study was to assess the effect of repeated cycles of five chemical disinfectant solutions on the roughness and hardness of three hard chairside reliners. Methods: A total of 180 circular specimens (30 mm x 6 mm) were fabricated using three hard chairside reliners (Jet; n = 60, Kooliner; n = 60, Tokuyama Rebase II Fast; n = 60), which were immersed in deionised water (control), and five disinfectant solutions (1%, 2%, 5.25% sodium hypochlorite; 2% glutaraldehyde; 4% chlorhexidine gluconate). They were tested for Knoop hardness (KHN) and surface roughness (mu m), before and after 30 simulated disinfecting cycles. Data was analysed by the factorial scheme (6 x 2), two-way analysis of variance (anova), followed by Tukey's test. Results: For Jet (from 18.74 to 13.86 KHN), Kooliner (from 14.09 to 8.72 KHN), Tokuyama (from 12.57 to 8.28 KHN) a significant decrease in hardness was observed irrespective of the solution used on all materials. For Jet (from 0.09 to 0.11 mu m) there was a statistically significant increase in roughness. Kooliner (from 0.36 to 0.26 mu m) presented a statistically significant decrease in roughness and Tokuyama (from 0.15 to 0.11 mu m) presented no statistically significant difference after 30 days. Conclusions: This study showed that all disinfectant solutions promoted a statistically significant decrease in hardness, whereas with roughness, the materials tested showed a statistically significant increase, except for Tokuyama. Although statistically significant values were registered, these results could not be considered clinically significant. (AU)