Evaluation of radiopacity and microhardness of composites submitted to artificial aging

Materials Research

Diogo Rodrigues Cruvinel²  Lucas Da Fonseca Roberti Garcia¹  Luciana Assirati Casemiro¹  Luiz Carlos Pardini¹  Fernanda De Carvalho Panzeri Pires-de-souza² 

[1] ,University of São Paulo School of Dentistry of Ribeirão Department of Dental Materials and ProsthodonticsRibeirão Preto SP ,Brazil

关键词: radiopacity;    microhardness;    composites;    artificial aging;   

DOI  :  10.1590/S1516-14392007000300021

来源: SciELO

【 摘 要 】

The purpose of this study was to assess the radiopacity and microhardness of different types of resin-based composites (RBC - hybrid; microhybrid; flowable; cement and polyacid modified) before and after being submitted to artificial accelerated aging. Fifty specimens (7 mm in diameter and 2 mm thick) were fabricated, 10 for each material. The specimens were light-cured and submitted to radiopacity and microhardness tests. After obtaining initial radiopacity and microhardness values, the specimens were taken to the artificial accelerated aging, and new measurement of radiopacity and microhardness of the samples was performed. Data were submitted to statistical analysis (Student's t-test - p < 0.05). None of the materials studied showed changes in radiopacity after artificial accelerated aging. There was a significant decrease in microhardness for the microhybrid and polyacid-modified RBC´s. This study suggests that radiopacity remains unaltered after materials are submitted to artificial accelerated aging. Microhardness, however, may vary due to plasticization of the aged RBC matrix.

【 授权许可】

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