Norasettrakoon, Natphajee, Varinee Srimahachota, Soranun Chantarangsu, Taweesak Prasansuttiporn, and Ornnicha Thanatvarakorn. “Effect of Etching Time on Microtensile Bond Strength to Amalgam-Discolored Dentin”. Khon Kaen University Dental Journal 26, no. 1 (February 28, 2023): 1–9. accessed September 24, 2026. https://he01.tci-thaijo.org/index.php/KDJ/article/view/253282.