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Die stone disinfection: incorporation of sodium hypochlorite
L G Breault1, J R Paul, S O Hondrum
1Main Dental Clinic, Schofield Barracks, US Army Dental Activity, Hawaii.
Purpose:
Previous research has shown that dental gypsum casts may be effectively disinfected by the substitution of 10% of the gauging water with 5.25% solution of sodium hypochlorite. The purpose of this investigation was to determine the properties of gypsum produced from such a solution as opposed to tap water alone.
Materials And Methods:
Tests included setting time, compressive strength, rigidity, diametral tensile strength, setting expansion, hardness, and detail reproduction.
Results:
The addition of sodium hypochlorite to the gauging water resulted in a statistically significant increase in the compressive strength and rigidity, and a decrease in setting time (p < or = .5). All other properties remained unchanged.
Conclusions:
This substitution may be an effective and convenient method of disinfecting gypsum casts in the laboratory without adversely effecting physical and mechanical properties.