We retrospectively reviewed and discussed hematostatic managements for tooth extraction in patients maintained on oral anticoagulant. From 2001 to 2007, 109 patients maintained with oral anticoagulant treatment underwent a total of 143 occasions of tooth extraction in our department.At the time of tooth extraction, oral anticoaglant medication was maintained on 76 occasions (53%), and had been discontinued on 55 occasions (38%). Postoperative bleeding happened in 5 cases (9.1%) in patients without interruption of oral anticoagulant, and in 3 cases (3.9 %) in patients with interruption. There was no significant difference in the Prothrombin Time International Normalized Ratio (PT-INR) and in postoperative hemostatic procedures between them.The results of this study suggest that dental extraction can be performed without modification of oral anticoagulant treatment in cases where the PT-INR is less than 3.0.Strict local hemostatic procedures are necessary to prevent postoperative bleeding
経口抗凝固薬（ワルファリン）内服患者の抜歯に関する検討
