Comparative Evaluation of Effect of Povidone Iodine Powder on Properties of Irreversible Hydrocolloid Impression Material - An Vitro Study

Abstract

Introduction and aim: Incorporation of povidone iodine to irreversible hydrocolloid impression material powder eliminates microorganisms, reduces the additional step of disinfection and chances of distortion of impression. The aim of this study was comparative evaluation of effect of PVP-iodine powder on setting time and detail reproduction and dimensional accuracy of irreversible hydrocolloid impression material.

Material and methods: Three groups were created, group I, II and III for evaluating setting time, surface detail reproduction and dimensional accuracy respectively. Each group was further divided into groups A and B having 20 samples each of control and test group (irreversible hydrocolloid modified by mixing PVP-iodine powder at concentrations 15 % by weight). Customized dies in accordance with ANSI/ADA specification No. 18 and ISO 21563 were used for measurement of setting time, surface detail reproduction and dimensional accuracy using stopwatch, microscope and digital vernier calliper respectively. All the data was tabulated and statistically analysed.

Result: Setting time presented a significant mean difference of 10.15000 between the two groups at p = 0.000. Surface detail reproduction was accurate in 95.0% of both groups, which was not statistically significant at p=1.000. The dimensional accuracy (%) of group A and B had a mean difference of 0.03900, which was not statistically significant at p=0.217.

Conclusion: The addition of povidone iodine powder to irreversible hydrocolloid impression material lead to increase in setting time but it did not influence surface detail reproduction and dimensional accuracy.