Ki67 expression in multilocular ameloblastoma (11.3 ± 7.9%) was significantly higher in unilocular ameloblastoma (7.0 ±4.7%) (p<0.05); Ki67 expression in ameloblastoma with ill - defined edge (12, 6 ± 8, 2%) was significantly higher in ameloblastoma with well - defined edge (with and without slerosis) (6.3 ± 3.1% và 6.1 ± 3.3%) (p<0.05); Ki67 expression in ameloblastoma with cortical perforation (12.8 ± 8.6%) was significantly higher in ameloblastoma without cortical perforation (7.7 ± 4.1%) (p<0.05).