Özet:

Introduction and Target: After the extension of hand curves, nikel-titanium curves and resiprocal systems and root channels, the aim was to study the defects occurring in the root dents. Method and Requirements: In our work, the development of the root end was completed in the same size, 60 pieces of central cutting tooth were used. It formed 12 dental control groups that were not applied, and the remaining 48 teeth were divided into 4 different groups, which would be 12 teeth in each group. The teeth were shaped with Hedström type hand curves, Protaper Universal (PTU) (Dentsply Maillefer, Balligues, Switzerland), Reciproc (VDW, Munich, Germany) and Twisted File Adaptive (TFA) (SybronEndo, Orange, CA) systems. Cuts from the teeth were taken in a distance of 3, 6 and 9 mm from the apex, and the samples were examined with a steoromicroscope under 25 X enlargement. Examples were evaluated by two observers who did not know the experiment groups. Inter-observator compatibility with the Cappa test, the difference between the trial groups and the Ki square test was statistically analyzed (α=0.05). In the Reciproc group, more defects occurred than in the TF Adaptive and control group (P < 0.05). There were no statistically significant differences in all other comparisons between the groups (P > 0.05). IN THE LIMITES of this ex vivo study, when the distribution of dentin defects is studied, the conclusion has been made that the TFA system can be used safely in the expansion of the root channel of wide and flat rooted teeth. However, it is believed that the findings obtained in our research would be appropriate to be evaluated by clinical studies as well.

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