Comparative Evaluation of Diffusion of Four Different Commercially Available Calcium Hydroxide Through Dentinal Tubules of Retreated Root Canal: An in Vitro Study

Abstract

The ultimate intent of a root canal therapy is directed towards the prevention and control of pulpal and periradicular infection .The curtailment of endodontic microbiota during root canal therapy is accomplished by various sequences of antimicrobial approaches in the form of various canal preparation and irrigation methods. Nevertheless it is recognized that chemo-mechanical instrumentation alone is unable to completely disinfect the root canal system 1. In study done by Tang G et al it was stated that the bacteria which remains in the root canal after instrumentation proliferates in between appointment 2. So to deal with such situation antimicrobial agents such as Calcium Hydroxide could be used as an intracanal medicament also breach in the treatment protocol can lead to endodontic failures with noticeable periapical changes in such situation intracanal medication in the form of calcium hydroxide is to be given.Calcium hydroxide was introduced to dentistry by Herman in 1920 3 . Today it is used widely as an intracanal medicament in the field of Endodontics 4,5 . Its antimicrobial property is directly related to diffusion of hydroxyl ion (OH -)ion resulting in an increase in the pH 6 .According to the study done by Estereia C et al there is a direct relation among concentration and velocity of ionic liberation with antimicrobial action 7 .