Rerata Rasio Mahkota-akar Gigi Insisif, Premolar, dan Molar Permanen Laki-Laki dan Perempuan Rentang Usia 15-25 Tahun di RSKGM FKG UI secara Radiografis = Average Crown-Root Ratio of Insisive, Premolar, and Molar Permanent Teeth of Male and Female Aged 15-25 Years Old in RSKGM FKG UI