Jaym1212 2010-07-20 20:40:22
Says “ozone treatment is an effective method in disinfecting the
gypsum casts”. [The disinfection efficiency comparison of different treatments on
dental impression and gypsum casts] Zhao H, Zheng D, Hong L.
College of Stomatology, West China University of Medical Sciences.
OBJECTIVE: In this study, the disinfecting efficiency of five
disinfecting methods to three bacterial: Staphylococcus epidermidis,
Streptococcus sanguis and Bacillus subtilis were evaluated. METHODS:
Germ free impressions and gypsum casts were divided into three teams
contained 16 impressions and 5 gypsum casts for each one. Each team
was smeared with each one of the three bacterial solutions. Then four
disinfecting methods were administrated on these impressions
separately, 2% glutaraldehyde immersion, 2% glutaraldehyde spray, 5%
Eric immersion, 5% Eric spray. And ozone treatment was administrated
on gypsum casts. Control teams were set up. After the treatment the
impressions and gypsum casts were sampled at standard sites. The
colonies were counted after culture and were used to deduce the
germicidal ratio as the standard of disinfecting efficiency. RESULTS:
There was no difference between the efficiencies of five disinfecting
methods for Streptococcus sanguis and Staphylococcus epidermidis. But
for B. subtilis, the immersion methods have the highest efficiency
among the methods and the ozone treatment has the least efficiency.
CONCLUSION: 2% glutaraldehyde immersion, spray, 5% Eric immersion,
spray are all effective disinfecting methods for impressions and ozone
treatment is an effective method in disinfecting the gypsum casts.
PMID: 12539655 [PubMed – indexed for MEDLINE]