Evaluation of Effective Chloramine-T Concentration to Be Incorporated in Dental Stone for Antimicrobial Activity

Abstract

The objective of this study was to determine the antimicrobial activity of type III gypsum at three different chloramine-T concentrations and to ascertain the most effective concentration to be added for optimum inhibitory activity against Candida albicans. MethodTen discs of type III gypsum were fabricated for each group. Standard type III gypsum without any disinfectant was used for the control group. For the experimental group, an admixture of chloramine-T and standard dental stone was employed in varying w/w concentrations (0.1%, 0.25%, and 0.5%). Discs were placed in a petri dish containing Sabouraud dextrose agar lawned with Candida albicans culture and incubated for 24 hours. The zone of inhibition created around the discs was measured and evaluated. ResultThe mean zone of inhibition (mean ± standard deviation) in the control group was 0 mm; 0.70±1.05 mm in group 1 (0.1% w/w concentration), 2.70 ± 2.35 mm in group 2 (0.25% w/w concentration), and 20.80 ± 1.68 mm in group 3 (0.5% w/w concentration). A one-way ANOVA test showed that there was a significant difference in the inhibition zone created around all groups (p < 0.05), with the discs of group 3 yielding the most positive results. ConclusionThe addition of 0.5% chloramine-T to type III gypsum showed the most promising result, out of the concentrations tested, as a self-disinfecting dental stone and could be used for further investigations.

Evaluation of effect of incorporating 0.5% Chloramine-T as disinfectant in type III gypsum product on its setting time and abrasion resistance

“…Dental casts can be disinfected using two distinct methods. 10 The first is surface disinfection, which can be accomplished with the help of spraying the disinfectant or dipping the cast in a disinfectant solution. The second method is to incorporate a disinfecting agent in the gypsum product being used.…”

“…The second method is to incorporate a disinfecting agent in the gypsum product being used. 10 Addition of this agent can be done: in powder form within the gypsum powder, or in the water which will be used to mix the gypsum, or it can be added by replacing the water with the disinfectant or adding disinfectant to the water.…”