Właściwości kształtujące narzędzi ProTaper Universal, WaveOne i ProTaper Next w sztucznie wytworzonych kanałach korzeniowych w kształcie liter L i S
Curvature straightening
In simulated L-shaped root canals, the original angle was 30 degree. And PTN maintained the canal curvature best (P < 0.05) while PTU straightened the curvature most (P < 0.05) (table 3).
In simulated S-shaped root canals, the original angle of coronal curvature was 20 degree and the apical one was 30 degree. PTN maintained the coronal curvature best (P < 0.05) while WO straightened the coronal curvature most (P < 0.05). But all files straightened the apical curvature visibly and there was no significant difference among them (P > 0.05) (table 3).
Discussion
The present study compared the shaping ability of PTU, WO and PTN in simulated L-shaped and S-shaped root canals. The simulated L-shaped root canals of 30 degree were severely curved canals [10] and the S-shaped were multi-curved [12]. The null hypothesis was rejected. The results of the present study showed that in severely curved canals, PTN caused less transportation at apical section and better maintained canal curvature, even though PTN produced more transportation at straight section compared with PTU and WO; in multi-curved canals, PTN caused the least coronal curvature straightened, [...]
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