Die stone disinfection: incorporation of sodium hypochlorite.
OBJECTIVE
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.


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.
Breault
L G
LG
Main Dental Clinic, Schofield Barracks, US Army Dental Activity, Hawaii.
Paul
J R
JR
Hondrum
S O
SO
Christensen
L C
LC
D002133:Calcium Sulfate / Q000737:chemistry*; D019245:Compressive Strength; D019551:Dental Disinfectants / Q000737:chemistry*; D004548:Elasticity; D006244:Hardness; D008422:Materials Testing; D003765:Models, Dental; D012973:Sodium Hypochlorite / Q000737:chemistry*; D013718:Tensile Strength
D019551:Dental Disinfectants; D012973:Sodium Hypochlorite; D002133:Calcium Sulfate