Fava L R
Int Endod J. 1991 Sep;24(5):258-62. doi: 10.1111/j.1365-2591.1991.tb01151.x.
A clinical study of maxillary central incisors was conducted in order to evaluate the incidence of postoperative pain following one-appointment root canal treatment using a modification of the double-flared technique to prepare the root canal system. Sixty teeth with necrotic pulps, from 52 patients whose ages ranged from 10 to 53 years, were included. Half of the teeth were prepared by the double-flared technique, while the other half were prepared by a modification of this technique. No difference was observed in the incidence of postoperative pain between the two groups.
为了评估使用改良双喇叭口技术预备根管系统的一次性根管治疗术后疼痛的发生率，对上颌中切牙进行了一项临床研究。纳入了52例年龄在10至53岁之间、患有牙髓坏死的60颗牙齿。其中一半牙齿采用双喇叭口技术预备，另一半采用该技术的改良方法预备。两组之间术后疼痛的发生率没有差异。
