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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.)

Microwave Disinfection: Cumulative Effect of Different Power Levels on Physical Properties of Denture Base Resins

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Author(s):
Senna, Plinio M. [1] ; Da Silva, Wander Jose [1] ; Faot, Fernanda ; Del Bel Cury, Altair Antoninha [1]
Total Authors: 4
Affiliation:
[1] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Prosthodont & Periodontol, Piracicaba - Brazil
Total Affiliations: 1
Document type: Journal article
Source: JOURNAL OF PROSTHODONTICS-IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY; v. 20, n. 8, p. 606-612, DEC 2011.
Web of Science Citations: 10
Abstract

Purpose: This study evaluated the cumulative effects of different microwave power levels on the physical properties of two poly(methylmethacrylate) (PMMA) denture base resins. Materials and Methods: Eight sets of four PMMA specimens each (two polymerized in a water bath and two using microwave energy) were immersed in beakers containing 200 ml of distilled water. Each beaker was subjected to microwave irradiation for 3 minutes at a power level of 450,630, or 900W. The surface roughness, surface hardness, linear stability, flexural strength, elastic modulus, impact strength, and fractographic propertieswere evaluated after either 6 or 36 simulated disinfection cycles. The data were statistically analyzed using ANOVA and the Tukey post hoc test (alpha = 0.05). Results: The polymerization method did not influence any property (p > 0.05) except linear stability. The surface roughness (p < 0.001) and hardness (p = 0.011) increased after 36 irradiation cycles at 630 or 900 W. The resin polymerized using microwave energy exhibited greater linear distortion (p = 0.012), and there was a cumulative effect on linear stability for both resins (p < 0.001). No significant change (p > 0.05) was observed in flexural strength; however, the elastic modulus decreased (p = 0.008) after 36 disinfection cycles. The impact strength and crack propagation angles displayed no significant differences (p > 0.05). Conclusion: Within the limitations of this study, it can be concluded that microwave disinfection at 450 W to 630 W for 3 minutes is safe for PMMA. (AU)

FAPESP's process: 07/06482-6 - Microwave disinfection of removable dentures: Effectiveness and effects on acrylic resin.
Grantee:Plinio Mendes Senna
Support Opportunities: Scholarships in Brazil - Master