CORRELATION OF Ki67 EXPRESSION TO DEGREE OF DYSPLASIA IN LINGUAL EPITHELIAL DYSPLASIA IN Rattus norvegicus EXPOSURED BY CIGARETTE SMOKE (Hubungan Ekspresi Ki67 Terhadap Derajat Displasia Pada Epitel Mukosa Lidah Rattus norvegicus yang Dipapar Asap Rokok) - Sari, Rina Kartika (Faculty of Dentistry, Universitas Islam Sultan Agung, 2019)