However, some research data show that mandibular incisors' root canal anatomy is comparatively complex, and root canal system has many variations.
但有资料表明下颌切牙的根管解剖形态较为复杂，变异较多。
The root canal systems were comparatively complex, but most of them were most of double three canals.
根管系统虽较为复杂，但主要是双根管和三根管型。
Meanwhile, various visual channels, such as the canal and the slits on the walls, penetrate the complex to allow people to feel life in the park and the city beyond.
与此同时，多条各种各样的视觉通道穿越建筑群，如小河及墙上的豁口，使人们同时又能感受到外面公园及城市的生活脉搏。
Objective to investigate how to increase the therapeutic efficacy of root canal treatment for complex cases.
目的探讨根管治疗困难病例的治疗方法。
For more denoising, a model structure of two canal filter is analyzed in terms of the complex frequency domain (z domain), and a algorithm for denoising is developed.
用复频域(z域)分析方法分析二通道滤波器的结构模型，提出测定信噪比的算法。
CONCLUSION: The tooth pulp diseases could be accurately diagnosed by applying helical CT and its 3D reconstrution methods, which could improve the diagnosis and treatment of complex root canal.
结论：应用螺旋CT及其三维成像技术，可对复杂的矸髓系统病变进行准确诊断，有效提高临床医生对复杂髓腔系统病变的诊断和治疗。
CONCLUSION: The tooth pulp diseases could be accurately diagnosed by applying helical CT and its 3D reconstrution methods, which could improve the diagnosis and treatment of complex root canal.
结论：应用螺旋CT及其三维成像技术，可对复杂的矸髓系统病变进行准确诊断，有效提高临床医生对复杂髓腔系统病变的诊断和治疗。
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