Rahmat Hidayat, and Helmi Fatchurrahman. “The Effect of Silica Dioxide (SiO2) Nanoparticle Coating and Duration of Coffee Immersion on Discoloration of Thermoplastic Nylon Denture Base”. Denta: Jurnal Kedokteran Gigi, vol. 14, no. 1, Aug. 2021, pp. 38-43, doi:10.30649/denta.v14i1.6.