“FAKTOR RISIKO KEPARAHAN GINGIVAL LEAD LINE PADA PETUGAS SPBU DI MEDAN : RISK FACTORS OF GINGIVAL LEAD LINE SEVERITY OF GAS STATION EMPLOYEE IN MEDAN” (2013) Dentika: Dental Journal, 17(3), pp. 251–254. doi:10.32734/dentika.v17i3.1723.