关键词:  锥形束CT；上颌前牙；弯曲；直径；桩核

Abstract:

Objective To detect the root curvature and diameter in human maxillary anterior teeth by cone-beam computed tomography (CBCT) and to provide some anatomical parameters related to post-core design. Methods A total of 129 human maxillary anterior teeth were selected and analyzed.The three-dimensional images of these teeth were obtained by multiplanar reconstructions (MPR) technique of CBCT,and the root curvature and diameter were observed and measured by dedicated software.  Results The mean labio-lingual root curvature degree  of maxillary central incisors was significantly smaller than those  of maxillary lateral incisors and canines (χ²=6.592，P=0.037),while the  labio-lingual root curvature  radius  was significantly larger than those of other  groups （χ²=8.504，P=0.014）. There were significant differences in the root length distribution of the mesio-distal curved part  between the three different maxillary anterior teeth groups（χ²=13.910，P=0.008）. The mean diameter measured labiolingually was significantly different from that measured mesiodistally  in various groups（P=0.000）. Conclusion  There are differences in root morphology of 129 human maxillary anterior teeth,and the root curvatures and diameters of human maxillary anterior teeth  present differently in CBCT.
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Key words:  cone-beam CT； maxillary anterior teeth； curvature；diameter； , post-core