Abstract
Objective To study the clinical application and efficacy of betamethasone-calcium hydroxide paste in one-time root canal treatment. Methods 160 teeth were randomly divided into the experimental group （betamethasone-calcium hydroxide） and the control group （cortisomol） with 80 cases in each group. Two kinds of cataplasm were sent into the root canals by using screw conveyor in each group after root canal preparation and drying. Then we filled the canals tightly with gutta-percha by lateral condensation. Permanent filling were operated after X-ray determination of canal filling. 3 days later, pain of the tooth was recorded. 6 and 12 months later, the cure rate of each group was observed. Results The pain rates and the cure rates were no significant difference between two groups （P〉0.05）. Conclusion Betamethasone-calcium hydroxide cataplasm and cortisomol have the basical same clinical effect in one-time root canal treatment. Key words: Betamethasone; Calcium hydroxide; Cortisomol; One-time root canal treatment
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