Comparison of Adhesion and Bond Strength of Gutta Percha and Polyurethane Materials with Root Dentin in Phosphate Buffer Saline Solution

Abstract

Objective:To find out the adhesion and bond strength of composites of guttapercha with 10% hydroxyapatite (HA) and polyurethane (10% and 20% HA) immersed in phosphate buffer saline (PBS) solution with root dentin. Materials and Methods:This descriptive cross-sectional study was carried out from June 2010 – August 2010 at the Department of Material Sciences, Queen Mary College of Engineering London, UK. Extracted human teeth were used for this study and in vitro root canal obturation was done. After filling the samples were immersed in Phosphate Buffer Saline (PBS) solution. Push out test and scanning electron microscopy (SEM) was done to find out the adhesion and bond strength of these materials. Results: Guttapercha had maximum bond strength,where as guttapercha with 10% hydroxyapatite had minimum bond strength compared to other bioactive materials used. Polyurethane composite with 20% HA was next to guttapercha in terms of its bond strength followed by polyurethane with 10% HA. Conclusion:Guttapercha obturating material proved to be the best obturating material but polyurethane (with 10% and 20% HA) also looked promising and it should be further tested and investigated for future use as choice of obturating material with enhanced properties