Hubungan usia, jenis kelamin, dan klasifikasi impaksi dengan lama tindakan odontektomi gigi molar 3 bawah impaksi (sebuah studi di RSKGM FKG UI) = Correlation between age, gender, classification of mandibular impacted third molar, and duration of mandibular impacted third molar odontectomy (a study in Dental Hospital Faculty of Dentistry University of Indonesia)