牙周韧带(PDL)麻醉是局部麻醉的一种方法。它可替代局部浸润和阻滞麻醉而进行口腔科的有关手术麻醉。我们于1985年来应用PDL麻醉施行拔牙术。现将结果总结如下。一、注射方法 选用一牙科注射器及一根5号或4(1/2)号的针头,依据牙根数目分别在根的 Periodontal ligament (PDL) anesthesia is a method of local anesthesia. It can replace the local infiltration and block anesthesia for stomatological surgery. We applied PDL anesthesia for dental extraction in 1985. The results are summarized below. First, the injection method selected a dental syringe and a 5 or 4 (1/2) number of needles, respectively, according to the number of roots in the root