RESEARCH ARTICLE


Effect of the Simulated Disinfection by Microwave Energy on the Impact Strength of the Tooth/Acrylic Resin Adhesion



Rafael L.X. Consani1, *, Marcelo F. Mesquita2, Marinaldo H. Zampieri3, Wilson B. Mendes4, Simonides Consani5
1 Department of Prosthodontics and Periodontics, Piracicaba Dentistry School, State University of Campinas, Brazil;
2 Department of Prosthodontics and Periodontics, Piracicaba Dentistry School, State University of Campinas, Brazil;
3 Piracicaba Dentistry School, State University of Campinas, Brazil
4 Department of Clinics, Itauna University Dentistry School, MG, Brazil
5 Department of Restorative Dentistry, Piracicaba Dentistry School, State University of Campinas, Brazil.


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2008 Bentham Science Publishers Ltd.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.5/), which permits unrestrictive use, distribution, and reproduction in any medium, provided the original work is properly cited.

* Faculdade de Odontologia de Piracicaba, UNICAMP, Av. Limeira, 901, 13414-903 - Piracicaba, SP, Brazil; Tel: (55) 19- 21065296; E-mail: rconsani@fop.unicamp.br


Abstract

The objective of this study was to determine the effect of simulated microwave disinfection on the tooth/acrylic resin impact strength. Acrylic molar teeth with a wax stick attached to the ridge lap were included in brass flasks. Specimens were made with Classico thermopolymerized acrylic resin, according to the groups: 1 and 5 - tooth with no treatment (control); 2 and 6 – tooth bur abrasion; 3 and 7 – tooth bur retention; and 4 and 8 – tooth monomer etch. Eighty specimens (n=10) were polymerized in bath cycle at 74ºC for 9 hours and deflasked after flask cooling. Specimen from groups 2, 4, 6 and 8 was submitted to simulated microwave disinfection in a microwave oven at 650W for 3 minutes. Impact strength test was performed with an Otto Wolpert-Werke machine (Charpy system) with an impact load of 40 kpcm. Fracture load value was transformed into impact strength as a function of the bond area (kfg/cm2). Collected data were submitted to ANOVA and Tukey’s test (α=.05) and results indicate that the simulated microwave disinfection decreased the impact strength in all treatments.

Key Words: Microwave disinfection, impact strength, tooth/acrylic resin adhesion, glossy ridge lap retention.