Distribusi penyakit periodontal berdasarkan kelompok usia di klinik periodonsia RSKGM FKG UI rekam medik periode 2004-2014 = Distribution of periodontal disease based on age group in periodontal clinic RSKGM FKG UI medical record 2004-2014 ([, Universitas Indonesia. Fakultas Kedoteran Gigi], 2015)