“Assessment Of Human Root Dentin's Fracture Resistance To Intra-Canal Calcium Hydroxide, Mineral Trioxide Aggregate, And Calcium Phosphate Cement”.

Background: The use of Ca(OH)2 in Endodontics was undisputed till date. Amidst its various merits, recently it has been observed that Ca(OH)2 treated teeth for extended periods show high failure rate because of unusual preponderance to root fracture. Newer materials like MTA and CPC have shown promising results in multiple endodontic applications including apexification. Objective: The aim of the present study is to compare the in vitro changes in the fracture resistance of human root dentin when exposed to intracanal Ca(OH)2 , MTA and CPC. Methodology: 60 freshly extracted single rooted teeth were selected and divided into four following groups of 14 teeth each Group I –saline group (control group) Group II - Ca(OH)2 group Group III – MTA group Group IV – CPC group Coronal access and endodontic instrumentation was done using specified instruments and techniques. The prepared canal was filled with saline solution, Ca(OH)2 paste, MTA and CPC and sealed with bonded composite resin and teeth were immersed in saline. After 30 days and 180 days the roots of 7 teeth from each group were sectioned horizontally into 1mm thick disks depending upon length of root into 4-5 sections and each disk was placed under a universal testing machine and the peak load at fracture was recorded.Results: Results showed that the mean peak load at fracture of Group I (saline group) was higher in both 30 days and 180 days specimen. Ca(OH)2 group showed a decrease in the fracture resistance as compared to all other groups in 30 and 180 day specimen.Conclusion and Interpretation: Based on results, both MTA and CPC can be efficiently used as an alternative to Ca(OH)2.