Neurofibromatosis type I with an Rare Oral Manifestation.

Aim: This study compares two major parameters regarding the respect of the canal path during the shaping: the canal deviation and the centering ability between two different systems on human canal teeth by using cone beam computed tomography (CBCT): Waveone; the new single-file systems in reciprocating motion and Protaper Universal; representing the conventional systems in continuous rotation; Materials and Methods: Fifty mesio-vestibular canals of the first permanent maxillary molars, freshly extracted and preserved in physiological serum, were distributed according to the instrument used to shape the canal into two groups of 25 canals each: Protaper Universal and WaveOne. The canals were scanned by CBCT before and after the canal shaping. The canal deviation and the centering ability were evaluated at two levels: 3 mm and 6 mm from the apex. Results: Our study revealed that there is no significant difference between the two compared systems. Conclusion: According to our study, the two systems are similar regarding the respect of the canal pat