Dillon Jaidev Singh, Gill Bobbin
Department of Conservative Dentistry and Endodontics, BRS Dental College and Hospital, Panchkula, Haryana, India.
J Conserv Dent. 2012 Oct;15(4):363-6. doi: 10.4103/0972-0707.101908.
To evaluate the discrepancies between the diameter of the canal and the first file to bind at the working length, before and after preflaring in teeth with apical curvatures.
Twenty teeth with apical curvatures were selected for the study. Following access, the patency file was fixed at the working length, and the apices were ground perpendicular to the canal at this level. Diameters of canal and the first file to bind at the working length were observed for each tooth, both before and after preflaring, under stereomicroscope at 30X magnification.
ANOVA and post hoc Bonferroni tests showed significant differences in both groups regarding anatomical diameter at working length and the first file to bind. The area of contact of the file at apical region remained the same in both groups.
Using the first file to bind for gauging the diameter of the apical canal was found to be an unreliable method in teeth with apical curvatures, even after preflaring.
评估根尖弯曲牙齿在预扩锉前后，根管直径与在工作长度处首次出现卡锉的锉之间的差异。
选择20颗根尖弯曲的牙齿进行研究。开髓后，将通畅锉固定于工作长度，在此水平将根尖垂直于根管磨平。在30倍放大率的体视显微镜下，观察每颗牙齿在预扩锉前后根管直径及在工作长度处首次出现卡锉的锉。
方差分析和事后邦费罗尼检验显示，两组在工作长度处的解剖学直径及首次出现卡锉的锉方面均存在显著差异。两组中锉在根尖区域的接触面积保持不变。
即使在预扩锉后，发现在根尖弯曲的牙齿中，使用首次出现卡锉的锉来测量根尖根管直径也是一种不可靠的方法。
