Ansari SN, Rathod D, Rathod GP, Bisht G. Assessment of Exogenous Pigmentation on Clear Elastomeric Modules: An in vitro Study. Orthod J Nepal [Internet]. 2018 Oct. 13 [cited 2024 Nov. 22];8(1):33-6. Available from: https://nepjol.info/index.php/OJN/article/view/21345