Clinical Efficacy Of Different Instruments For Single Tube Chronic Apical Periodontitis

Objective: To evaluate the clinical efficacy of three nickel-titanium instruments for single-tube chronic apical periodontitis,which provides a basis for clinicians to find ideal root canal preparation instruments during one-visit root canal treatment.Method: Ninety patients with single root canal chronic periapical periodontitis who were treated in the Second Affiliated Hospital of Xinjiang Medical University from June 2017 to April 2018 were randomly divided into three groups according to the instruments used: WO group(WaveOne),PTN group(ProTaper Next)and PT group(ProTaper).At the same time,the time needed for root canal preparation to begin and end was recorded in three groups,and the patient's postoperative pain and clinical results of 6 months after surgery were returned.Results: The number of bacterial colonies decreased significantly in each group,and the difference of bacterial colonies decreased significantly(P<0.05);the difference of root canal preparation time among three groups was statistically significant(P<0.05),WO group was the shortest and PT group was the longest.There were significant differences in pain VAS scores between the 3 groups at 24 h and 7d after surgery(P<0.05).There was no statistically significant difference in clinical efficacy between the 3 groups after 6 months(P>0.05).Conclusion: Compared with the other two instruments,ProTaper Next has the best ability to remove infectious agents in the root canal,and the operation time is shorter,and has the best clinical efficacy at 6 months after surgery.Mechanical preparation can not completely remove all microorganisms in root canals.Mechanical preparation should be combined with chemical preparation to improve the success rate of root canal therapy.