| 3156 In Vitro Simulation of the Apical Barrier at MTA-Dentin Interface and Its Characterization | ||
|
P. RITWIK1, B. BER2, R. MOISEYEVA2, and N.K. SARKAR2, 1School Oral Health Program(Kuwait-Forsyth), Salmiya, Kuwait, 2Louisiana State University School of Dentistry, New Orleans, USA Objectives:Clinically, MTA (Mineral Trioxide Aggregate, Dentsply Tulsa Dental) reportedly induces a calcified barrier at the root apex. The aim of this study was to simulate this barrier in vitro and to characterize its composition and morphology. Methods:The canals in two extracted single-rooted human teeth were endodontically prepared and filled with a slurry of MTA-water. The filled teeth were exposed to synthetic tissue fluid (pH=7.2) at 37°C for 2 months. Following exposure, the teeth were sectioned perpendicular to the canals, polished, and examined by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDXA). Results:SEM revealed the formation of an interfacial layer surrounding the filling material and continuous with the canal wall. EDXA identified the presence of Ca, P and O in the interfacial layer. This composition is similar to that of hydroxyapataite (HA). Conclusions:The formation of the interfacial layer is attributed to a dynamic interaction between MTA, dentin and the tissue fluid. | ||
| Seq #290 - Properties of Endodontic Materials, Biological Properties 9:00 AM-11:00 AM, Saturday, 9 March 2002 San Diego Convention Center Room 4 (Upper Level) | ||
|
Back to the Dental Materials: VIII - Others-Non-metallic Program
| ||