Hanaa Ewas Korany,Wael Huessien Kamel And Dalia Ali Ahmed Moukarab,

ABSTRACT
Objective: The Aim Of This Study Was To Evaluate The Root Canal Transportation Comparing Different Kinematic Motion And Metallargical Compostion Used In Truss Access.Materia & Methods: Eighty Extracted Mandibular Firstmolars Were Collected And Randomly Divided Into Two Main Groups (n=40) According To Access Cavity Type 40 For Conventional Access Cavity And 40 For Truss Access Cavity, Then Every Group Was Subdivided Into 4 Equal Subgroups (n=10) Following Access Cavity Preparation Of All Samples, The Roots Were Vertically Mounted Half-way In Transparent Auto Polymerizing Acrylic Resin Inside A Silicon Mold (10 Cm X 10 Cm) To Fixthem. Group I; Reciproc Blue (size 25, Taper 0.08) .group II; HyflexCM Files(sizes 20,25,30 Taper 0.04), Group III; Endostar E3 Basic Files(size, 30, Taper 0.08, Size 25, Taper 0.06, Size 30, Taper 0.04) And Group IV: Wave One (size 25 Taper 0.08).Pre And Post Instrumentation Scanning For The Root Canals Were Done Via CBCT. Data Were Analyzed Using Kolmogorov-Smirnov And Shapiro-Wilk Tests. Intergroup Comparisons Were Done Using One-way ANOVA Followed By Tukey?s Post Hoc Test, While Intragroup Comparisons Were Done Using One-way Repeated Measures ANOVA Followed By Bonferroni Post Hoc Test.

Results: Regarding Root Canal Transportation: There Was A Significantdifference Between Files:coronal And Middle:-Endo Star E3 Had The Highest Value,while Apical: Reciproc Blue Had The Highest One. HyflexCM Fileshad The Lowest Value Middle And Apical While,coronal: Wave One Had The Highest One. Regarding Centric Ratio: There Was A Significantdifference Between Different Groups: Coronal And Middle: Hyflexfileshad The Highest Value, While Apical: Wave One Had The Highest One. On The Other Hand, Wave One Had The Lowest Values Middle And Apical, While, Coronal:-Reciproc Blue Had The Lowest One.Conclusion: Truss Access Affect Root Canal Transportation And Centralization Of Both Full Rotation And Reciprocation Files With Diferent Metallurgy.