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Quintessence Publishing: Journals: IJP
The International Journal of Prosthodontics

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

ISSN 0893-2174

September/October 2007
Volume 20 , Issue 5

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Efficacy of High-Level Microwave Disinfection of Dental Gypsum Casts: The Effects of Number and Weight of Casts

Einar Berg, BDS, Dr Odont / Oyunn Nielsen / Nils Skaug, DDS, Dr Odont

Pages: 463464
PMID: 17944332

The aim of this study was to determine if the bactericidal effect of microwaving gypsum casts is maintained at maximum capacity of the oven (16 casts). Batches of 8 and 16 gypsum casts made from in vivo impressions were divided in half. One half of each cast was microwaved at 900 W for 5 minutes. The remaining halves were left untreated. When assessed for bacteriological growth, the median cfu/mL of the untreated casts was between 105 and 106, while the microwaved casts showed a cfu/mL of 0, indicating that microwaving as described will disinfect gypsum casts even at maximum capacity of the oven. Int J Prosthodont 2007; 20:463464.

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