Mostafa Mohammed Abdul-Baset, Reem Ahmed Lutfy And Shaimaa Ismail Gawdat,

ABSTRACT


Aim:�To Evaluate The Resistance To Fracture Of Root Canals Filled With A New Bioceramic-based System (Smart Paste Bio And Propoints) As Compared To AH Plus And Gutta-percha. Methodology:�Fifty-two Straight Human Single-rooted Extracted Mandibular Second Premolars Were Decoronated To A Length Of 15 Mm. The Specimens Were Prepared By Using The ProTaper Universal System Up To F4 File And Then Randomly Distributed Into Two Experimental (n = 13each) And Two Control Groups (n = 13 Each): Group A (Smart Paste Bio And Propoints PT), Group B (AH Plus Sealer And Gutta-percha), Group C (the Root Canals Were Left Unprepared And Unfilled - Negative Control) And Group D (the Root Canals Were Prepared, But They Were Not Filled ? Positive Control). All Specimens Were Stored At 100% Humidity For One Week To Allow Complete Setting Of The Sealers. The Roots Within Each Group Were Submitted To (1 Mm/min) Compressive Loading Till Fracture. Extracted Data Were Analyzed Statistically By One-way ANOVA Test.

Results: Negative Control Group (C) Showed The Highest Mean Fracture Resistance, However, With �no Statistical Significant Difference Between It And Experimental Groups ( A, B) (P >0 .05). On The Other Hand Positive Control Group (D) Showed The Lowest Mean Fracture Resistance Value Which Was Statistically Significant From All Other Groups (p=0.0022) . Conclusion: Teeth Obturated With The Two Tested Obturation Systems Showed Comparable Fracture Resistance Values That Was Not Statistically Different From The Un-instrumented Roots.