Fractographic analysis, accuracy of fit and impact strength of acrylic resin

Brazilian Oral Research
Fernanda FaotAltair Antoninha Del Bel Cury

Abstract

This study evaluated accuracy of fit, impact strength, types and morphology of fractures of a microwave acrylic resin polymerized with a cycle alternative to that recommended by the manufacturer. Onda Cryl was polymerized according to the manufacturer's instructions (MC), 3 min at 360 W, 4-min pause, and 3 min at 810 W; and with an alternative cycle (AC) of 6 min at 630 W. Accuracy of fit was measured at 3 points at the right (A) and left (B) ridge crests and at the midline (C) on the posterior palatal seal for each denture base (n = 10/group). The measurements were taken immediately after finishing and after 30-day storage in water. The impact strength test (Charpy method) was performed with a 40 kJ/cm load (n = 20/group). Fractographic analysis was accomplished for all fragments and the fracture types were characterized by means of their morphology, crack propagation angles and microstructure. Accuracy of fit data were analyzed by ANOVA, impact strength and radius values were compared by the t test, and the fractographic analysis data, by the Wilcoxon Mann-Whitney test. The significance level was fixed at p < 0.05. No statistical differences were found between the two cycles of polymerization used. However, after the 30-day s...Continue Reading

References

Jul 1, 1975·Journal of Biomedical Materials Research·R P Kusy, D T Turner
Sep 1, 1981·The Journal of Prosthetic Dentistry·M S Beyli, J A von Fraunhofer
Mar 1, 1995·Dental Materials : Official Publication of the Academy of Dental Materials·J J Mecholsky
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May 31, 2001·Journal of Oral Rehabilitation·A A Del Bel CuryS M Ganzarolli
Jan 7, 2004·Dental Materials : Official Publication of the Academy of Dental Materials·C-P LaiH-H Tay
Nov 14, 2006·The Journal of Prosthetic Dentistry·Fernanda FaotRenata C M Rodrigues Garcia

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Citations

Oct 11, 2011·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Plinio M SennaAltair Antoninha Del Bel Cury
Jun 2, 2011·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Rômulo Rocha RegisRaphael Freitas de Souza
Aug 1, 2020·Materials·Gabriele CervinoLuca Fiorillo

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