Efficacy of high-level microwave disinfection of dental gypsum casts: the effects of number and weight of casts.
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 10(5) and 10(6) [corrected] 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.
Berg
Einar
E
Faculty of Dentistry Department of Oral Sciences-Prosthodontics, University of Bergen, Norway. einar.berg@odont.uib.no
Nielsen
Øyunn
Ø
Skaug
Nils
N
D002133:Calcium Sulfate; D015169:Colony Count, Microbial; D004203:Disinfection / Q000379:methods*; D008872:Microwaves; D003765:Models, Dental / Q000382:microbiology*
D002133:Calcium Sulfate