Siska Ella Natassa, Rika Mayasari Alamsyah and Raja Arief Rahman Siregar 2013. FAKTOR RISIKO KEPARAHAN GINGIVAL LEAD LINE PADA PETUGAS SPBU DI MEDAN : RISK FACTORS OF GINGIVAL LEAD LINE SEVERITY OF GAS STATION EMPLOYEE IN MEDAN. Dentika: Dental Journal. 17, 3 (Jul. 2013), 251-254. DOI:https://doi.org/10.32734/dentika.v17i3.1723.