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为了解研究前牙根管的数目和形态，以及它们不同的根管类型，作者检查１２００个前牙，每个牙齿均用两种方法摄片。结果前牙有４种根管形态，双根管比单根管少见，双根管的发生率为９．６％（１１５／１２００）．作者指出，优良的ｘ线片在确定牙内外解剖是有明显价值的。必须从两个或多个角度摄片，如果在主根管的近中或远中有一条线状透射影像，则应考虑为双根管。
To understand the number and morphology of anterior root canals and their different root canal types, the authors examined 1,200 anterior teeth, each using two methods of radiography. Results There were 4 kinds of root canal morphology in anterior teeth. The double root canal was rarer than the single root canal. The incidence of double root canal was 9.6% (115/1200). The authors point out that good x-ray films are of obvious value in determining the anatomy of the tooth. The film must be taken from two or more angles. If there is a linear transmission image in the near or far of the main root canal, it should be considered a double root canal.