Abstract: This study investigated the effect of root canal sealing drugs on the treatment of pulp necrosis in young permanent teeth and the changes of imaging indicators during pulp revascularization. Eighty children (80 teeth) with pulp necrosis in young permanent teeth were retrospectively studied. According to the treatment method, 44 cases (44 teeth) in the study group and 36 cases (36 teeth) in the control group. Both groups were treated with revascularization. The study group was treated with calcium hydroxide root canal sealing medicine, and the control group was treated with root canal sealing drug with triple antibiotic paste. The clinical efficacy of the two groups before and after treatment was compared, and Cone Beam CT (CBCT) was used to examine the crown-to-root ratio and root canal wall thickness of the affected teeth at different times before and after treatment in the two groups. After 12 months of treatment, the crown-to-root ratio of the affected teeth in the study group was lower than that in the control group. After 6 months of treatment and 12 months of treatment, the measured value of the root canal wall thickness in the study group was greater than that in the control group (P<0.05). After 3 months of treatment, the therapeutic effect of the study group was better than that of the control group (P<0.05). Pulp revascularization combined with calcium hydroxide root canal sealing is effective in treating pulp necrosis of young permanent teeth. CBCT can observe the redevelopment of permanent teeth in children after treatment, which is beneficial to improve the treatment effect.

Key words: revascularization, root canal sealant, young permanent teeth, pulp necrosis, CBCT, calcium hydroxide