锥形束CT在上颌前牙牙根形态观测中的应用

目的：利用锥形束CT（CBCT)测量上颌前牙牙根弯曲及牙根直径,为临床桩核设计提供依据。方法：对129颗上颌前牙进行CBCT扫描，采用多平面重建（MPR）获得牙体的三维重建图像，并进行定点、定线与定角测量，分析上颌前牙牙根的弯曲情况和牙根直径。结果：上颌中切牙在唇舌向的弯曲度小于上颌侧切牙和上颌尖牙2个牙位（χ²=6.592，P=0.037），但弯曲半径大于其他2个牙位（χ2=8.504，P=0.014）。上前牙在近远中向的3种弯曲长度分布构成比比较差异有统计学意义（χ2=13.910，P=0.008）。上前牙在唇舌向和近远中向的牙根直径比较差异有统计学意义（P=0.000）。结论：129颗上颌前牙牙根在CBCT上显示出不同的形态，不同牙位的牙根弯曲度、弯曲部位及牙根直径不同。
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Application of cone-beam CT in root morphology observation of human maxillary anterior teeth

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.