IN VITRO MICROSCOPIC ANALYSIS OF APICAL 3MM OBTURATION AFTER GT, LIGHTSPEED, AND PROFILE ROOT CANAL PREPARATION

Abstract

Objective: To compare the quality o f continuous wave obturation technique following preparation o f theapical third with three different NiTi rotary instrumentation systems. Methodology: Mesiobuecal canals o f 75 extracted human maxillary’ and mandibular molars were used in study. After instrumentation 25 canals each with GT P or file .06 and Light Speed, canals were obturated with continuous wave technique 3-5 mm from the working length. Roots were sectioned at 1mm, 2 mm,and 3 mm from the apex and stained with methylene blue. Two operators evaluated pictures o f each section(24X) for obturation quality. Grades of 1- good adaptation, thin sealer film; 2- irregularities with thick film of sealer separating gutta-percha for up to I 3 from the canal walls; 3- voids or thick film o f sealer separatinggutta-percha from the canal walls for more than 1/3 were assigned. Results: The average obturation grade at I mm was G T r 2 .16, Profile =1.96. Light Speed 1.80; at 2 mmGT =1.84. ProFile =1.52, LightSpeed =1.52; at 3 mm G T = I.4 0 , Profile = 1.40, Light Speed =1.20. Over all Light Spccd showed better results but Kniskal-Wallis test showed no differences among groups at all threelevels. Statistically significant improvements were revealed in the quality of tilling as the distance fromthe apex increased. Conclusion: Under the conditions of this study, root canals shaped by GT, Light Speed and Profiles revealedsimilar quality of root canal obturation. The quality of root canal obturation improved in all groups as thedistance from the apex increased.

Keywords

• reproductive health
• reproductive rights
• knowledge attitude practices