EFFECT OF SODIUM PHOSPHATE DIBASIC SOLUTION ON THE APICAL SEALING ABILITY OF WHITE MINERAL TRIOXIDE AGGREGATE; AN IN VITRO STUDY

Abstract

The purpose of this in vitro experimental study was to evaluate the effect of 20% sodium phosphate dibasic solution on apical sealing ability of white mineral trioxide aggregate (WMTA).

Mineral trioxide aggregate (MTA) was originally introduced to seal perforations and root-end cavities. It has been used widely for numerous applications through root repair to bone healing due to its capabilities to seal off the routes of communications among external surface of tooth and root canal system. The apical sealing ability of MTA as retrograde filling material has been tested through different leakage technique. The main target in apical resection is to achieve an enclosed seal between the periapical tissues and apical portion of the root canal by retrograde root- end filling.

Forty single rooted extracted lower premolar teeth were subjected to instrumentation and obturation procedure. The specimens were sectioned at 2mm from the apex and were coated with three layers of nail varnish, except for the apical surface. Standardized 4mm deep and 0.8mm wide retrograde cavities were prepared. The specimens in control group were filled with WMTA mixed with distilled water while specimens of experimental group were filled with WMTA mixed with 20% sodium phosphate dibasic solution. The specimens were then submerged in 0.2% Rhodamine B dye for a period of one week. Light microscope with ocular micrometer was used to analyze the dye leakage data. Chi - squared test revealed no significant difference between two groups.

It was concluded from the present study that the addition of 20% sodium phosphate dibasic solution had no effect on apical sealing ability of WMTA.