Abstract:

Abstract：Objective To assess the diagnostic accuracy of cone beam computed tomography in comparison with digital radiography for detecting simulated complete vertical root fractures and imcomplete vertical root fractures in extracted human teeth. Methods Sixty teeth were endodontically prepared and divided into 3 groups，2 experimental and 1 control. The teeth in experimental groups were artificially fractured and fixed together with 20 complete VRFs （group one）and 20 imcomplete VRFs（group two）. Twenty teeth in control group were kept intact（group three）. Three observers evaluated the digital radiagraphs and CBCT images in terms of accuracy for VRFs detection. Results The overall accuracy for detecting VRFs was significantly higher for CBCT compared with the digital radiagraphs （P < 0.05）. The Fisher analysis showed no significant difference between complete RVFs and imcomplete RVFs for CBCT（P > 0.05）. Conclusion The CBCT technique has higher accuracy than 2-D radiography for in vitro dignosis of VRFs；we can use CBCT to detect early VRFs.

Key words: CBCT, digital radiographs, vertical root fracture

摘要：

目的 通过体外模型对比研究锥形束CT和根尖片对根管纵裂的诊断价值。方法 收集2010—2011年郑州大学口腔医学院和肇庆市口腔医院因正畸或牙周病拔除的健康离体单根牙60颗，根管预备充填后，去除根充材料，再用根管钉用轻力使40颗牙根纵裂：20颗完全型牙根纵裂、20颗不完全型牙根纵裂；其余20颗完整牙根为对照。按正常牙位排列置于石膏模型上，分别用根尖片和锥形束CT扫描，阅片后作出诊断。结果 根尖片与CBCT诊断根管纵裂的敏感度差异有统计学意义（P < 0.05）。CBCT诊断根管治疗后完全型牙根纵裂和不完全型牙根纵裂的差异无统计学意义（P > 0.05）。结论 CBCT比根尖片诊断根管治疗后牙根纵裂的敏感度高，临床上可用CBCT辅助诊断早期牙根纵裂。

关键词: CBCT, 数字化根尖片, 牙根纵裂