《Table 1 Available case reports of maxillary first molar with fewer root canals and C-shaped root ca

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《Endodontic management of the maxillary first molars with two root canals: A case report and review of the literature》

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DB:Distobuccal；MB:Mesiobuccal；N/A:Not available；P:Palatal.

In maxillary first molars，fusion may be divided into three types:fusion of the distobuccal（DB）root with the palatal（P）root（Type A），fusion of the mesiobuccal（MB）root and the distobuccal root（Type B），and fusion of two palatal roots（Type C）[6].We performed an extensive review of available reports about maxillary first molars with fewer root canals and C-shaped root canals（Table 1）.As the table showed，the majority of fusion occurred between DB and P roots（Type A），and MB and DB roots（Type B），with a lower incidence of the fusion of two P roots，which is referred to as Type C.