关键词: 急性牙髓炎；牙髓摘除术；镍钛；ProTaper

Abstract:

Objective     To evaluate the analgesic effect of three kinds of pulpectomy on acute pulpitis of molars. Methods     A total of 279 molars with acute pulpitis were  divided into three groups based on the different treatment schemes. The pulp was removed at the first visit and covered with calcium hydroxide in group A; root canal preparation was carried out with stainless steel K-file and step-back technique with calcium hydroxide used as intracanal dressing in group B; and preparation was carried out with ProTaper instruments and the crown-down technique using calcium hydroxide as intracanal dressing in group C. The pain indexes of the three groups, the rate of pain in canal at subsequent visit and the rate of flare-up were all recorded. Results    There was no significant difference in the pain indexes in the three groups(P>0.05), but the rate of pain occurrence at subsequent visit was higher in group A than in groups B and C with significant differences(P<0.05).  Conclusion     Root canal preparation is able to remove the pulp thoroughly and therefore should be recommended for the treatment of the disease at the first visit.  

Key words: Acute pulpitis; Pulpectomy;  Nickeltitanium;  ProTaper