图 4. 下颌第一恒磨牙MMC的三种可能解剖形态（Pomeranz分类）.
Fig 4 Middle mesial canals of three possible anatomy in mandibular first molar（type of Pomeranz）
从上至下依次为“独立”、“歧状”和“融合”解剖型。第一列：MMC 显微镜 × 16；第二列：术前片；第三列：试尖片；第四列：根充片。
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