Clinical study on one-visit root canal therapy in chronic apical periodontitis

Objective To observe long-term effect and evaluate clinical feasibility of one-visit root canal therapy in chronic apical periodontitis.Methods 228 molars with chronic apical periodontitis were selected.Group Ⅰ (120 molars) was treated by one-visit root canal therapy,while group Ⅱ (108 molars) was treated with multi-visit root canal therapy.Two groups both took crown down root canal preparation method,root canals irrigated with 0.3％ sodium hypochlorite and 17％ EDTA and obturated by means of lateral condensation technique.A comparison of clinical effect was done between two groups after 2 years.Result The cure rate of group Ⅰ was 88.79％ (95/120),while that of group Ⅱ was 92.08％ (93/108),without statistical difference between two groups (x 2 =0.649,P ＞ 0.05).Conclusion There was no difference in long-term treatment effect between two kinds of treatment methods. Key words: Chronic apical periodontitis;  One-visit root canal therapy;  Long-term effect