[The effect of  disinfectant soaking on dental gypsum model size].
OBJECTIVE
To study the influence of disinfectant soaking on the dimensional stability of three kinds of dental gypsum model.


METHODS
Three commonly used gypsums ( type III,IV,Vtype) in clinic were used to make 24 specimens for 50 mm×15 mm×10 mm in size. One hour after release, the specimens were placed for 24 h. A digital caliper was used to measure the size of the gypsum model. Distilled water immersion was as used control, glutaraldehyde disinfectant and Metrix CaviCide disinfectant soaking were used for the experimental group. After soaking for 0.5h, the gypsum models were removed and placed for 0.5 h, 1 h, 2 h, 24 h. The size of the models was measured again using the same method. The data was analyzed with SPSS10.0 software package.


RESULTS
The initial gypsum model length was (50.07±0.017) mm, (50.048±0.015) mm and (50.027±0.015) mm. After soaking for different times, the size of the model changed little, and the dimensions changed less than 0.01%.


CONCLUSIONS
The results show that disinfectant soaking has no significant effect on dental model dimensions.
Department of VIP Dentistry, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai 200011, China. zhucaoyun@126.com
Cao-yun
CY
Zhu
Yun-wen
YW
Xu
Kan
K
Xu
D002133:Calcium Sulfate; D004202:Disinfectants; D005976:Glutaral; D008422:Materials Testing; D003765:Models, Dental; D012973:Sodium Hypochlorite; D014867:Water
D004202:Disinfectants; D014867:Water; D012973:Sodium Hypochlorite; D005976:Glutaral; D002133:Calcium Sulfate