本文测量和分析了 10 8颗因重度牙周炎而拔除的人类恒磨牙根分叉解剖结构 (根分叉宽度和根面凹陷 ) ,结果发现 :2 37个根分叉中 ,其开口以下 2 mm处宽度小于牙周刮匙可能的最小宽度 0 .75 mm者 ,仅占 3.8% ;牙根面凹陷有较高的发生率 ,且均位于根分叉内侧面。由此推论 :磨牙根分叉开口过于狭小 ,并非是导致磨牙根分叉病变治疗困难的主因 ;集中于根分叉内侧面的根面凹陷 ,可能是牙周炎根分叉病变治疗困难和预后不良的主要原因 In this paper, we measured and analyzed the root bifurcation anatomical structures (root bifurcation width and root depressions) of 10 8 human molars with severe periodontitis. The results showed that among 2 37 root bifurcations, the following 2 mm less than the width of the periodontal curette may be the smallest width of 0.75 mm, accounting for only 3.8%; root denting a higher incidence, and are located in the root bifurcation lateral. It is concluded that the molars root bifurcation opening is too narrow, not the main cause of the treatment of molars root bifurcation lesions; root depression located on the medial side of the root bifurcation may be the treatment of periodontitis root bifurcation lesions with poor prognosis main reason