Kartika D, Putri RA. The Root Length Of Mandibular Second Molar By Using Periapical Radiography On Batak Ethnics Aged 18-22 Years In Faculty Of Dentistry University Of Sumatera Utara. imjm [Internet]. 2017 Dec. 1 [cited 2024 Apr. 20];16(2). Available from: https://journals.iium.edu.my/kom/index.php/imjm/article/view/1118