Evaluation of disinfected casts poured in gypsum with gum arabic and calcium hydroxide additives

The Journal of Prosthetic Dentistry
Khalid M AbdelazizEdward C Combe

Abstract

Disinfection of stone casts is an important measure for the control of cross-contamination. Many approaches have been used to disinfect stone casts, but information regarding the accuracy of the resultant casts is limited. The purpose of this in vitro study was to evaluate the dimensional accuracy, incidence of abutment fracture, and the abutment reproduction of disinfected stone casts made from elastomeric impressions and to determine the effect of gum arabic and calcium hydroxide additives on these properties. Two aqueous solutions of chemical disinfectants (0.525% sodium hypochlorite and 0.1% povidone iodine) were used as mixing water substitutes for 3 types of dental stone: Types III (Lab Stone), IV (Mile Stone), and V (Die Keen). These stone powders were subjected to further modification by adding 1% gum arabic and 0.132% calcium hydroxide before mixing at the manufacturer-recommended liquid/powder ratios (0.30 for Type III, 0.21 for Types IV and V, respectively). As these additives increased the fluidity of the mix, reduced liquid/powder ratios (0.26 for Type III, 0.19 for Types IV and V, respectively) were also evaluated. Unmodified stone powder mixed with water served as the control. These modifications resulted in 7 te...Continue Reading

Citations

Dec 30, 2015·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Arvind TripathiRiti Madhok
Nov 6, 2020·Journal of Pharmacy & Bioallied Sciences·Anthony K FernandesAbdul Malik

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