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The International Journal of Prosthodontics

Edited by George A. Zarb, BChD, DDS, MS, MS, FRCD(C)

ISSN 0893-2174

May/June 2004
Volume 17 , Issue 3

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Cytotoxicity of Denture Base Resins: Effect of Water Bath and Microwave Postpolymerization Heat Treatments

Janaina Habib Jorge, DDS, MSc/Eunice Teresinha Giampaolo, DDS, PhD/Carlos Eduardo Vergani, DDS, PhD/Ana Lúcia Machado, DDS, PhD/Ana Cláudia Pavarina, DDS, PhD/Iracilda Zeppone Carlos, DDS, PhD

Pages: 340–344
PMID: 15237883

Purpose:This study compared the effect of two postpolymerization heat treatments on the cytotoxicity of three denture base resins on L929 cells using 3H-thymidine incorporation and MTT assays. Materials and Methods:Sample disks of Lucitone 550, QC 20, and Acron MC resins were fabricated under aseptic conditions and stored in distilled water at 37°C for 48 hours. Specimens were then divided into three groups: (1) heat treated in microwave oven for 3 minutes at 500 W; (2)heat treated in water bath at 55°C for 60 minutes; and (3)no heat treatment. Eluates were prepared by placing three disks into a sterile glass vial with 9 mL of Eagle’s medium and incubating at 37°C for 24 hours. The cytotoxic effect from the eluates was evaluated using the 3H-thymidine incorporation and MTT assays, which reflect DNA synthesis levels and cell metabolism, respectively. Results:The components leached from the resins were cytotoxic to L929 cells when 3H-thymidine incorporation assay was employed. In contrast, eluates from all resins revealed noncytotoxic effects as measured by MTT assay. For both MTT assay and 3H-thymidine incorporation, the heat treatments did not decrease the cytotoxicity of the materials tested. Conclusion:Resins were graded by 3H-thymidine incorporation assay as slightly cytotoxic and by MTT assay as noncytotoxic. Cytotoxicity of the denture base materials was not influenced by microwave or water bath heat treatment. Int J Prosthodont 2004;17:340–344.

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