Ahmed, Nourhan Sayed Saleh, et al. “Evaluation of Patient Satisfaction and the Color Difference Between Natural Teeth and All-Ceramic Crowns Fabricated from ‘Celtra Press’ Treated With Different Surface Finishing Protocols. (Randomized Controlled Clinical Trial)”. Journal of Medical and Pharmaceutical Sciences, vol. 5, no. 3, Sept. 2021, pp. 83-69, https://doi.org/10.26389/AJSRP.R140321.