Mian Khalid Iqbal, Louay Abrass, Marlene Oviedo Marmo, Helmut Walsch.
In vitro microscopic analysis of apical 3mm 1 obturation after GT, lightspeed, and profile root canal preparation.
J Dow Uni Health Sci Jan ;1(1):10-4.

Objective: To compare the quality of continuous wave obturation technique following preparation of the apical third with three different NiTi rotary instrumentation systems. Methodology: Mesiobuccal canals of 75 extracted human maxillary and mandibular molars were used in study. After instrumentation 25 canals each with GT ProFile .06 and LightSpeed, 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 of 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 1/3 from the canal walls; 3- voids or thick film of sealer separating gutta-percha from the canal walls for more than 1/3 were assigned. Results: The average obturation grade at 1mm was GT= 2.16, ProFile =1.96, LightSpeed =1.80; at 2 mm GT =1.84, ProFile =1.52, LightSpeed =1.52; at 3 mm GT =1.40, ProFile =1.40, LightSpeed =1.20. Overall LightSpeed showed better results but Kruskal-Wallis test showed no differences among groups at all three levels. Statistically significant improvements were revealed in the quality of filling as the distance from the apex increased. Conclusion: Under the conditions of this study, root canals shaped by GT, LightSpeed and ProFiles revealed similar quality of root canal obturation. The quality of root canal obturation improved in all groups as the distance from the apex increased.

PakMediNet -Pakistan's largest Database of Pakistani Medical Journals - http://www.pakmedinet.com