Mustafa Mahmoud Shalaby Ahmed, Wafaa Ahmed Omar And Marwa Mahmoud Ali Bedier,

ABSTRACT


Aim: This In Vitro Study Was Carried Out To Evaluate The Effect Of Lowering The Temperature Used With Continuous Wave Compaction (CWC) From 200�C To 150�C On The Push-out Bond Strength And Interfacial Adaptation Of TotalFill BC Sealer In Relation To AH Plus Sealer.

Materials and Methods: A Total Of Eighty-eight Extracted Human Single-rooted Teeth With Single Straight Root Canals Were Selected For This Study. The Samples Were Randomly Allocated Into Four Groups (n=22) According To The Type Of Sealer Used And The Temperature Of Warming Gutta-percha; (AH Plus/ 150�C), (AH Plus/200�C), (TotalFill BC/150�C) And (TotalFill BC/200�C) Groups. The Roots Were Sectioned Horizontally Into 2 Mm. Thick Slices, And The Bond Strengths Were Measured Using A Standardized Push-out Test. The Mode Of Failure Was Examined By Visual Inspection Under Stereomicroscope. Before The Push-out Test, Five Representative Samples From Each Group Were Randomly Selected To Qualitatively Assess The Interfacial Adaptation Using Environmental Scanning Electron Microscopy (ESEM).

Results: The Mean Push-out Bond Strength Values Of The Two Sealers Recorded Significant Lower Values At 150�C Than At 200�C. The Predominant Mode Of Failure Among Groups Was Adhesive Failure, Except For TotalFill BC/200�C Group That Showed Mostly Mixed Failure. Regarding The Interfacial Adaptation, The Mean Gap Width Measurement At 150�C Was Wider Than That At 200�C For Both Sealers.

Conclusions: Using 150�C During CWC Technique Compared To 200�C Significantly Decrease The Bond Strength Values And The Interfacial Adaptation Of TotalFill BC Sealer As Well As AH Plus Sealer.