The Open Dentistry Journal

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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.


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.

Article Information

Identifiers and Pagination:

Year: 2008
Volume: 2
First Page: 13
Last Page: 17
Publisher Id: TODENTJ-2-13
DOI: 10.2174/1874210600802010013

Article History:

Received Date: 25/10/2007
Acceptance Date: 12/12/2007
Electronic publication date: 22/1/2008
Collection year: 2008

2008 Bentham Science Publishers Ltd.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution License (, 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:

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