Abstract
Aim: To evaluate the limits of the shaping ability of MaxWire® alloy file in the treatment of pre-created large and curved root canals with different apical sizes by using cone-beam computed tomography (CBCT). Materials and methods: Forty-five permanent maxillary first molars with moderately curved palatal roots (20°-30°) were divided into three groups, and large root canals were created with apical diameter #35 (Group 1), #40 (Group 2) or #50 (Group 3) by using BioRace NiTi System. Then, they were reshaped with the MaxWire alloy file, XP-endo Shaper®. Canals were scanned before and after instrumentation by using the CBCT scanner. Canal transportation (CT), centering ratio (CR), % increased prepared area (PA), and % increased prepared outline (PO) at 2, 3, and 4 mm from the apex were calculated. Data were statistically analyzed at P < 0.05. Results: There was a significant difference in the mean increase in PO in all apical sizes and all three levels. At both 3 mm and 4 mm levels the maximum PA and PO were achieved in apical size 35, while at 2 mm level the maximum values were obtained in apical size 40. There was no statistically significant difference in CT and CR within groups at 2 mm distance from the apex. Conclusion: Max Wire alloy technology of this novel instrument makes it possible to clean and touch the dentin walls of large and curved root canals. Small FOV and small voxel size of CBCT could also be used in shaping ability studies in endodontics.
Highlights
The main aim of root canal treatment is the elimination and prevention of microbial infection.[1]
prepared area (PA) and prepared outline (PO) increased in all apical size groups at each experimental level
In all apical sizes and all three levels (2 mm, 3 mm and 4 mm from the apex), there was a significant difference in the mean increase in PO (P < 0.05)
Summary
The main aim of root canal treatment is the elimination and prevention of microbial infection.[1] Previous studies have shown that the size of apical instrumentation is an important factor in removing root canal bacteria effectively. To completely remove all bacteria from these types of root canals, large instruments with higher taper should be used, which are less flexible and do not stay in the center of the canal. These may cause untouched dentine walls and transportation of the main root canal.[5]
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