Poehom, Kanokporn. “Sealant and Permanent First Molars Status Among Grade 3 Students in Nakhon Sawan: Academic Year 2007”. Journal of Health Science of Thailand 18, no. 1 (January 17, 2018): 51–58. Accessed January 31, 2025. https://thaidj.org/index.php/JHS/article/view/1625.