Impact and fracture resistance of an experimental acrylic polymer with elastomer in different proportions

Materials Research

Fernanda De Carvalho Panzeri Pires-de-souza²  Heitor Panzeri²  Marcelo Aparecido Vieira²  Lucas Da Fonseca Roberti Garcia¹  Simonides Consani¹ 

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

关键词: impact testing;    fracture toughness;    poly (methyl methacrylate);    elastomer;   

DOI  :  10.1590/S1516-14392009000400007

来源: SciELO

【 摘 要 】

The purpose of this study was to evaluate the impact and fracture resistance of acrylic resins: a heat-polymerized resin, a high-impact resin and an experimental polymethyl methacrylate with elastomer in different proportions (10, 20, 40 and 60%). 120 specimens were fabricated and submitted to conventional heat-polymerization. For impact test, a Charpy-type impact tester was used. Fracture resistance was assessed with a 3-point bending test by using a mechanical testing machine. Ten specimens were used for each test. Fracture (MPa) and impact resistance values (J.m-1) were submitted to ANOVA - Bonferroni's test - 5% significance level. Materials with higher amount of elastomer had statistically significant differences regarding to impact resistance (p < 0.05). Fracture resistance was superior (p < 0.01) for high-resistance acrylic resin. The increase in elastomer concentration added to polymethyl methacrylate raised the impact resistance and decreased the fracture resistance. Processing the material by injection decreased its resistance to impact and fracture.

【 授权许可】

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