Results:The frequencies of lateral canals were 39.4% and 36.7% in the mesiobuccal root (MBR) of maxillary molar s and in the mesial root(MR)of mandibular molar s separate roots,respectively.

 
  • 4%25,下頜磨牙近中根側支根管平均出現率36。7%25,磨牙的近中頰根及近中根均出現較多的側支根管及管間側支。(2)約2/3的根尖孔位置不在根尖。
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