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Objective: assessment the canal transportation and centering ability of two single file systems (Reciproc and Neoniti) in curved mesiobuccal (MB) root canal of natural lower first molars, by cone beam computed tomography (CBCT) scanning. Methods: Forty non-calcified Mesio-buccal root canals with complete formed root and apical curvature of 20-45o and Radius ≤ 15mm were chosen from extracted human lower first molars. The samples were divided based on the instrument (n=20) into two main groups group I (Reciproc R 25/08) and group II (Neoniti R 25/08). Each group has another subdivided based on the motion into (n=10) Subgroup A: reciprocation motion Subgroup B: full rotation motion. The apical transportation, centering ability and radius change were measured by preand post-instrumentation CBCT scans by superimposing in four section (2, 4, 6 and 8 mm from apical foramen). Values were recorded, tabulated for each group and statistically analyzed. Results: The ability of instruments to remain centered in prepared canals at 2and 4 mm levels was higher in Neoniti reciprocation in MD dimension. The centering ratio at 6 and 8 mm level and in BL dimension were not significantly different between the tested subgroups. The change of the radius values and percentage produced no significant difference. Conclusion: Both Neoniti and Reciproc systems haven’t significant difference in canal transportation, centering ability and change in curvature radius expect when using reciprocation motion Neoniti produced significantly better results than Reciproc especially in the apical third. (2740) Fahd M Hadhoud E.D.J. Vol. 65, No. 3 Preparation of curved canals and preserving dental anatomy at the same time are a big challenge of chosen the suitable instruments (5). The presence of nickel-titanium (NiTi) instruments opened a new view in endodontics due to their super elasticity. Now, the idea of one file systems has been exists and is currently being used. It simplifies the preparation procedures minimal instrument failure and cross contamination. One file systems can be distinguished according to their motion into full rotation files and reciprocating files. Neoniti A1 (NEOLIX, Chatresla-Foret, France) is one of these newly introduced single-file systems with full rotary motion (6). A reciprocating motion (similar to balanced force technique) (7), a shorter clockwise motion to free the file from the dentinal wall, thus allowing it to reach the apex (8). Different methods can be used to evaluate shaping of root canal. Now, CBCT used as used. CBCT scanning provides a three-dimensional morphologic view,(9). Comparing different systems of root canal preparation was reported less canal transport and more root canal centrality with reciprocating motion (10,11). On other hand, some studies reveled that reciprocating action caused transportation (12,13). MATERIALS AND METHODS

egyptian dental journal /egyptian dental journal

Cone beam computed tomography assessment of canal transportation, centering ability, and radius change of two single file systems in curved root canals