| Objective: The disinfection of dental stone casts using microwave radiation
has been shown, but doubts remain regarding its efficacy under
various conditions. The aim of the present study was to evaluate the
efficacy of microwave disinfection on wet and dry dental stone casts
contaminated by a resistant microorganism.
Material and methods: In this in vitro study, 34 stone half-casts were
prepared, contaminated with Bacillus subtilis and divided into two
groups. After drying the specimens of one group for 15 minutes using
450 W microwave energy, all the wet and dry specimens were exposed
to 900 W microwave energy for 5 minutes. Specimens were then indi- 1 Dental and Periodontal
vidually transferred to nutrient broth culture medium and after Research Center, Tabriz
10 minutes, one milliliter from each tube was cultured in nutrient agar University of Medical
media for 24 hours, and the colonies were counted in CFU/mL. Data Science, Tabriz, Iran
were analyzed using multifactorial ANOVA and Bonferroni tests. 2 Department of Prosthetic
Results: Casts in both wet and dry groups were disinfected to a high Dentistry, Dental School,
level (6 log), with no statistically significant differences between them
(P<0.05).
Tabriz University of Medical
Science, Tabriz, Iran
Conclusion: According to the results, microwave irradiation can disinfect
dental stone casts to a high degree, irrespective of moisture level.
3 Department of Prosthetic
Dentistry, Dental School,
However, the result should be confirmed by exploring with other species
of resistant microorganisms. |