Dimensional Evaluation of Stone Die from Irreversíble Hydrocolloid Impression afther Disinfection

Abstract

During routine molding procedures in Dentistry, the material gets in touch with oral fluids such as blood, saliva, exudates and others, which can carry pathogenic microorganisms that cause contagious diseases such us herpes, hepatitis, tuberculosis, AIDS, among others. Disinfection by immersing the molds in chemical solutions has been adopted. This work evaluated dimensional alterations in casts obtained from an irreversible hydrocolloid, after disinfection. A molding device with a standard metallic die representing the tooth ready to receive the crown was used during the evaluation. The molds were then immersed in deionized water and gluteraldehyde at 2% for 30 minutes. Only the control group was not immersed: they were poured in a special type IV (Durone), immediately after being taken. A special standard metallic crown, which adapted itself to the referred casts, was used to evaluate their dimensions. The combination die plus standard crown was submitted to a microscopic analysis by a depth microscope. Data from the evaluation were submitted to a statistical analysis, and the results showed no statistically difference among the groups studied.