Microhardness of esthetic restorative materials at different depths

Materials Research

Regina Guenka Palma-dibb²  Alessandra Elias Palma²  Edmir Matson¹  Michelle Alexandra Chinelatti²  Renata Pereira Ramos² 

[1] ,University of São Paulo Ribeirão Preto School of Dentistry Department of Restorative Dentistry

关键词: composite resin;    glass ionomer cement;    compomer;    microhardness;   

DOI  :  10.1590/S1516-14392003000100015

来源: SciELO

【 摘 要 】

The aim of this study was to analyze the microhardness of two resin-modified glass ionomer cements (Vitremer; Fuji II LC); two polyacid-modified composite resins (Freedom; F2000) and a hybrid composite resin (Prodigy), at different depths from the upper surface. Six hemi-cylinders (3 mm height; 3 mm radius) per tested material were obtained. Vickers Hardness was determined using a micro-indentation tester. For each hemi-cylinder, three indentations were taken at one of the following depths: 0.4, 1.0, 2.0 and 2.6 mm. For each material, microhardness average was calculated. Statistical analysis was performed using two-way ANOVA and Tukey test Fuji II LC and Vitremer showed no statistically significant difference among hardness means recorded at the four analyzed depths. The hybrid and the polyacid-modified composite resins showed significant decrease microhardness with increasing depth. It may be concluded that for the RMGIC, microhardness was not affected at depths up to 2.6 mm. On the other hand, both hybrid and PMCRs should de better placed in increments not thicker than 2 mm to achieve optimal hardness throughout the restoration.

【 授权许可】

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