Abstract
Aim: To examine and measure a possible skew in the longitudinal position of the apical constriction in human maxillary central incisors, lateral incisors, and canines around the circumference of the canal. Materials and Methods: Twenty-five human maxillary central incisors, lateral incisors, and canines were split and imaged with ×25 magnification. The most apical and coronal limits of the apical constriction were identified and measured. Results: Analysis of the data indicates that a majority (>64%) of maxillary central incisors, (>69.6%) lateral incisors, and (>70%) of canines exhibit an unevenness or “skew” of the apical constriction of >100 μ m in the incisoapical dimension. A statistically significant (P Conclusion: The termination of working length is more likely to end in an apical constriction zone rather than at an apical constriction point or plane.
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