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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
dentistry
The effect of disinfectants on the properties of dental gypsum: 1. Mechanical properties
Journal of Prosthodontics, Volume 11, No. 3, Year 2002
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Description
Purpose: This study was conducted to evaluate the effect of selected disinfectants incorporated in the liquid of dental stones on material strength properties with the aim of developing a material with acceptable mechanical properties. Materials and Methods: Two types of dental stone (types III and V) were mixed with aqueous solutions of 0.525% sodium hypochlorite, 0.1% and 10% povidone-iodine, and 2% glutaraldehyde, and with water as a control. The liquid/powder ratios recommended by the manufacturer were used. These materials were subjected to further modification by adding a mixture of 1.0% gum arabic and 0.132% calcium hydroxide to the hemihydrate powders before mixing with the disinfectant solutions at 2 different liquid/powder ratios for each. Both the regular and the modified materials were tested for compressive and diametral tensile strength after 1 hour and 1 week from the start of the mix. The structure of set materials was determined by scanning electron microscopy examination of fracture surfaces. Results: The disinfectants often reduced the strength of both types of dental stone. However, using either 0.1% povidone-iodine or 0.525% sodium hypochlorite resulted in strength values comparable with that of the control. The addition of gum arabic and calcium hydroxide helped reduce the mixing liquid/powder ratios, improving the strength properties of the disinfected materials. Conclusions: Chemical disinfectants reduce the strength of dental gypsum when used as mixing water substitutes. Gum arabic and calcium hydroxide additives permit a lower liquid/powder ratio and can help offset this weakening. Copyright © 2002 by The American College of Prosthodontists.
Authors & Co-Authors
Abdelaziz, Khalid Mohamed
United States, Minneapolis
School of Dentistry
Egypt, Mansoura
Faculty of Dentistry
Combe, Edward Charles
United States, Minneapolis
School of Dentistry
Hodges, James Steven
United States, Minneapolis
University of Minnesota Twin Cities
Statistics
Citations: 13
Authors: 3
Affiliations: 3
Identifiers
Doi:
10.1053/jpro.2002.126860
ISSN:
1059941X
e-ISSN:
1532849X
Research Areas
Environmental
Health System And Policy