Effect of Immersion Duration in Coffee Beverage on Colour Stability of Polymethyl Methacrylate Denture Base Reinforced with 1% Chitosan Nanogel (Laboratory Study). Dentika Dental J. [Internet]. 2023 Dec. 22 [cited 2026 Feb. 5];26(2):90-6. Available from: https://idjpcr.usu.ac.id/dentika/article/view/11719