Microtensile bond strength of polyacid-modified composite resin to irradiated primary molars

Abstract

Aim: This study evaluated the influence of various doses of radiotherapy on the microtensile bond strength (μTBS) of compomer resin to dentin and enamel in primary molars. Materials and methods: Thirty-five intact primary molars were collected and divided into seven groups. Teeth were irradiated with doses from 10 to 60 Gy, except for the control group. Compomer restorations were performed, and enamel-compomer resin beams and dentin-compomer resin beams were tested at a crosshead speed of 1 mm/min. Results: No statistically significant difference was found between the irradiated tooth enamel and the control group (F = 1.1468; p = 0.194). However, statistically significant differences were evident among the dentin groups (F = 11.050; p < 0.001). Conclusion: Radiation may not cause a significant difference in the μTBS of compomer resin to primary tooth enamel, but appears to dose dependently decrease its bond strength to primary tooth dentin. Clinical significance: Radiotherapy may affect the success rate of compomer fillings in primary teeth, especially in deeper cavities with exposed dentin.