ĐẶC ĐIỂM LÂM SÀNG CỦA TÌNH TRẠNG RĂNG VĨNH VIỄN NHIỄM FLUOR Ở TRẺ TỪ 7-10 TUỔI TẠI THANH TRÌ, HÀ NỘI NĂM 2025

Abstract

Objective: Analysis of Clinical Characteristics of Permanent Teeth with Dental Fluorosis in Children Aged 7–10 Years at Lien Ninh Primary School, Thanh Trì District, Hanoi, 2025. Subject and methods: A descriptive cross-sectional study was conducted on 818 children aged 7–10 years at Lien Ninh Primary School, Thanh Trì District, Hanoi, in 2025, including 454 boys and 364 girls. Results: According to the clinical classification, type 1 accounted for 94,85%; type 2 for 3,09% and type 4 for 2,06%. Based on the Thylstrup–Fejerskov (TF) index, narrow white horizontal lines were observed in 4,12%; narrow opacities with a diameter <2 mm in 2,06% and broad, irregular, and confluent opacities in 93,83% of cases. According to the Tooth Surface Index of Fluorosis (TSIF), fluorosis limited to the incisal edge of anterior teeth and cusp tips of posterior teeth was found in 11,34%, fluorosis involving more than one-third but less than two-thirds of the tooth surface in 85,57%, and fluorosis with discoloration (yellow or brown) without pitting in 3,09%. Based on the Fluorosis Risk Index (FRI), lesions were located on the cervical third of the crown in 5,15%; the middle third in 19,59%; the incisal/occlusal two-thirds in 65,98% and the incisal edge or cusp tips/occlusal surface of posterior teeth in 24,74%. Conclusions: White or cream-colored opacities accounted for the majority of lesions. Broad, irregular, and confluent opacities were the most frequently observed type. Fluorosis involving more than one-third but less than two-thirds of the tooth surface had the highest proportion. The most common sites of involvement were the incisal two-thirds of the crown or the incisal edge/cusp tips of permanent teeth.