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Abstract Purpose This study aims to compare the effect of Er;Cr:YSGG laser irradiation at sub-ablative powers with or without APF gel (1.23%) application in preventing primary teeth enamel demineralization. Methods Eighty primary posterior teeth were separated into eight study groups (n = 10). The control group is G1 (no treatment), while groups G2, G3, and G4 were treated with the Er,Cr:YSGG laser at 0.75W, 0.5W, and 0.25W at 20 Hz, 40% air/ 60% water irrigation. G6, G7, and G8 were treated with the Er,Cr:YSGG laser at 0.75W, 0.5W, and 0.25W at 20 Hz, 40% air/ 60% water irrigation, and APF gel (1.23%) application. Group G5 was treated with APF gel solely. The study samples were PH cycled for nine days after surface treatment. Sample surfaces were tested for microhardness, roughness, SEM, and X-RD. Results A significant increase in microhardness after Er;Cr:YSGG laser treatment with 0.25W and 0.5W alone or in combination with APF gel (1.23%) application with the higher demineralization reduction observed in combination treatment groups. Roughness evaluation revealed a non-significant (p ≤ 0.05) increase in roughness value between the treatment groups and control group after PH cycling. Conclusion Sub-ablative Er;Cr:YSGG laser parameters can be utilized for caries inhibition and increasing enamel microhardness of primary teeth and may be suggested as an alternative to conventional methods.
Mahdi et al. (Mon,) studied this question.