Objective: To investigate the feasibility of observing profile morphology and measuring thickness of softtissue in maxillary anteriorteeth using cone-beam CT (referred to as CB CT ). Methods: Mouth opening device was used to retract the cheeks and tongue from the facial soft tissue and palatal masticatory mucosa, respectively. Maxillofacial area of a healthy adult male was scanned by cone-beam CT and the data was reconstructed.The measurement was operated on the sagittal plane im ages through long axis. The labial mucosa thickness was obtained at six different sites (from gingival margin to 3mm apically from the crestof alveolar ridge);The thickness of palatalmucosa was obtained atone site (1mm apically from the crestofalveolarridge).The measurementwas carried outin two rounds by five observers.The thickness of the soft tissue was calibrated and operated three times by five observers in the first round.And the measurement was repeated with an internalofone week by one observer. Results: Tooth,alveolarbone and softtissue can be distinguished on the im age of CB CT clearly. Pvalue of ANOVA at each site was 0.476, 0.698, 0.179, 0.160, 0.301, 0.072 and 0.715 respectablely between different observers.Tvalue between the two rounds of measurement was 0.200 (P = 0.848). Conclusions: One case measurement of softtissue thickness in anterior region by CB CT showed highly accuracy and good repeatability.%目的：探讨应用锥形束CT(以下简称CBCT)测量前牙区软组织厚度的可行性。方法：健康成年男性受试志愿者1例，用开口器排开唇颊黏膜及舌体组织，实施颌面部CBCT扫描并三维重建。在牙体长轴矢状位图像测量对应牙体的软组织厚度；唇侧测定6个点(距龈缘1mm、2mm及牙槽嵴顶处，牙槽嵴顶上方1mm、2mm、3mm处)，腭侧测定1个点(牙槽嵴顶上方1mm处)。5名测量者在首轮测量中分别标定、测量各位点处的软组织厚度3次；1名测量者完成首轮测定后间隔一周，重新标定、测量各位点处的软组织厚度3次。采用方差分析及配对t检验分析测量者间的一致性及测量者自身的可重复性。结果：排开唇颊粘膜的上前牙CBCT影像能清晰区分牙体、牙槽骨及软组织；各位点处软组织厚度在不同测量者间的方差分析P值分别为0.476、0.698、0.179、0.160、0.301、0.072及0.715；相同位点处软组织厚度在两轮测量之间的t=0.200(P=0.848)。结论：1例上颌前牙区软组织厚度的CBCT测量精度高，重复性好。
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