Especially in the advanced localized periodontitis of molar with narrow furcation entrance diameter if un treated, the prognosis is poor, unless the oral hygieneis optimal in the furcal area.

• 一般而言,根叉齿槽骨病变患齿,尤其是带有狭窄根叉入口的进行性牙周炎之臼齿,如果根叉区域无法有效的牙菌斑控制或是没有治疗,则预后极差。