KẾT QUẢ SOI MÒN BỀ MẶT MEN RĂNG VĨNH VIỄN TRÊN THỰC NGHIỆM

Abstract

Objective: To evaluate the surface roughness of permanent enamel after etching with 37% phosphoric acid and Er: YAG laser. Subjects and methods: The study was conducted on 30 intact permanent premolars, without caries, restorations, or crowns, from Vietnamese patients aged 12 years or older who were indicated for orthodontic extraction at the Department of Oral Surgery – Faculty of Odonto-Stomatology, Hanoi Medical University. These teeth were divided into 3 groups depending on the enamel etching method: Group 1 (n=10) etched with 37% phosphoric acid, Group 2, and Group 3 (n=10) etched with Er: YAG laser with an energy level of 100mJ and frequencies of 15Hz and 20Hz, corresponding to power levels of 1.5W and 2W, respectively. The surface roughness of the teeth was measured using a 3D Laser Scanning Microscope. Results: Enamel etched by the Er: AYG laser created a surface roughness (Ra) in Group 2 of 2.10 ± 0.21 µm and in Group 3 of 2.02 ± 0.15 µm, higher than the surface etched by 37% phosphoric acid, which had an Ra of 1.82 ± 0.18 µm. Conclusion: Etching the permanent enamel surface with an Er: YAG laser at an energy level of 100mJ and frequencies of 15Hz and 20Hz, corresponding to power levels of 1.5W and 2W, results in a rougher enamel surface compared to etching with 37% phosphoric acid.