Abstract: Objective: To observe the curative effect of Dycal and glass ion double bottom and Dycal single bottom in the treatment of deep caries in proximal surface of deciduous molars. Methods: A total of 100 patients with deep caries in the proximal surface of deciduous molars were randomly divided into groups. In the first group, Dycal calcium hydroxide substrate and glass ion sandwich substrate were used to enamel dentin boundary, and then, 3M composite resin was used to fill the enamel layer. In the second group, the enamel layer was filled with 3M resin layer after Dycal monolayer. Results: For deep caries in the proximal surface of deciduous molars, the success rate of Dycal and glass ion double substrate was higher than that of Dycal single substrate. The incidence of clinical symptoms and abscission rate were lower than that of the Dycal monolayer group. Conclusion: It is suggested to use Dycal and glass ion double bottom to treat deep caries in the proximal surface of deciduous molars.

Key words: Dycal, glass ionomer, proximal cavity