furthermore, it expanded the scope of its application, drew up fractal graph with more higher number times and more complex root value, added the thought of escape time.
walked in the dinghu natural protection area , observing the semi-tropical plants , especially the complex root of trees.
在鼎湖山自然保护区的原始地带徒步前进,沿途观察亚热带的植物,尤其是树木间错综复杂的根系。
conclusion: cbct can provide accurate information of canal system. more than 20% of mandibular first premolars had complex root canal systems showing multi--canal or double root canals.
结论:下颌第一前磨牙根管解剖结构复杂,多根管发生率超过20%,cbct可为根管系统提供準确依据。
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.
conclusion understanding the various morphology of the roots and complex root canals of maxillary first premolars, is of great value for the diagnosis and clinical treatment of root canal morphology.