LIANA AMINOV,  MARIA VATAMAN, MADALINA MOCANU, CRISTINA ELENA  IANCU, ANISIA IULIANA ALEXA5, DANA CRISTIANA MAXIM,  LAURA  ELISABETA CHECHERITA<br>Comparative Study Regarding the pH Influence on Surface Microhardness of Two Reparative Materials Used in Endodontic Treatment in Prosthetic Purpose

LIANA AMINOV, MARIA VATAMAN, MADALINA MOCANU, CRISTINA ELENA IANCU, ANISIA IULIANA ALEXA5, DANA CRISTIANA MAXIM, LAURA ELISABETA CHECHERITA
Comparative Study Regarding the pH Influence on Surface Microhardness of Two Reparative Materials Used in Endodontic Treatment in Prosthetic Purpose

Abstract:

The irrigation solutions used in endodontic therapy have different pH values and different chemical properties that have sometimes been found to adversely affect the physical and chemical characteristics of repairing materials. These materials are used mainly in areas of inflamed tissue, with a lower pH. The aim of the study was to evaluate the changes in the hardness of two reparative dental materials depending on pH variations and to determine which of the additives they are combined with gives them greater stability to pH variations. The changes in surface microhardness (Vickers microhardness) of two repairing materials: Grey MTA (Dentsply Tulsa Dental, USA) and BioAggregate (Innovative BioCeramix Inc., Vancouver), mixed with four different vehicles (distilled water, physiological saline, lidocaine and calcium chloride), subsequently subject to different environmental pH value, were assessed. The analysis of the average surface hardness showed a significant increase in hardness at high pH (pH = 7) and higher values for BioAggregate as compared with MTA. Ph variations of the environment in which biomaterials are setting reduce their microhardness and surface resistance, and this was more significant when the two materials were combined with lidocaine and distilled water. Keywords: endodontic treatments, reparative systems, biomaterials, surface microhardness, low pH,stomatognathic system homeostasis

Issue: 2014, Volume 65, Issue 7

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