拔牙后干槽症的发病率约为2—3％,拔除下颌阻生牙(第三磨牙)时发病率高达25—30％。几篇无对照组的文献报告,局部使用抗菌素如磺胺类和四环素族类药物,则发病率可减少到7％左右。本文用双盲法在有对照组情况下,研究局部应用林可霉素(Lincomycin)凝胶泡沫的作用。方法:对拔除下颌阻生牙病人,一组在牙槽窝内放入消毒的浸透盐酸林可霉素的凝 The incidence of dry socket after tooth extraction is about 2-3%, the incidence of mandibular impacted teeth (third molar) is as high as 25-30%. Several uncontrolled group reported that the incidence of topical use of antibiotics such as sulfonamides and tetracyclines reduced the incidence to about 7%. In this paper, we investigated the effect of topically applied Lincomycin gel foams in a double-blind, placebo-controlled manner. Methods: For patients with impacted mandibular impacted teeth, a group of sterile lincomycin hydrochloride condensate