Sebastian O, Ginting R, Ishak A. User-Centered Redesign of Dental Cheek Retractor Using Quality Function Deployment. j.sist.teknik.industri. [Internet]. 2026 Jun. 8 [cited 2026 Jun. 9];28(2):117–124. Available from: https://talenta.usu.ac.id/jsti/article/view/25288