The Clinical Evaluation Of Ultrasonic Irrigation Applied In One-visit Root Canal Therapy Of Chronic Pulpitis

Objective: To assess the efficacy of ultrasonic irrigation of the root canal which was applied in one-visit root canal therapy of Chronic pulpitis. Methods: A total of 62 patients with 62 teeth were selected. The teeth were divided into two group ( syringe irrigation group, and ultrasonic irrigation group) randomly according to the doctors' office visiting order. The syringe irrigation group 30 teeth proceed access preparation, explored root canal, determine the working length, and prepared the root canal with the crown-down technique in local anesthesia. During the process 1.25% NaOCL (sodium hypochloride) and 17% EDTA were used to irrigate root canal. The ultrasonic irrigation group 32 teeth were used the ultrasonic irrigation after syringe irrigation. In the end, the two groups were obturated the root canal by lateral compaction technique. To observe the quality of root canal obturation, the number of lateral canals obturated, the incidence of pain during three days, curative effect after 3 months. Results: Immediately radiographs show that every group root canal obturation was good. After three days, the two groups patients were requested to return visit to get the message and compare the syringe irrigation group with the ultrasonic irrigation group about the pain, the difference was significant (P<0.05) . It is considered that the incidence of ultrasonic irrigation group's pain was lower than syringe irrigation. The ultrasonic irrigation group's collateral pulp canal packing fraction haven't been obviously improved, the difference was not significant (P>0.05). It is not considered that the difference of the two group's collateral pulp canal packing fraction. The difference of curative effect of two groups after 3 months was not significant (P>0.05). It is not considered that the difference of the two group curative effect after 3 months. Conclusion: Ultrasonic irrigation of the root canal will obviously decrease postoperative pain and improve the quality of root canal obturation. So ultrasonic irrigation of the root canal is a useful technique in root canal therapy.