MKI67 and ameloblastoma: The primary objectives of the present study were to assess the proliferative activity of SMA, UA, and desmoplastic ameloblastoma by evaluating the Ki-67 labelling index using immunohistochemistry, to quantitatively compare Ki-67 expression among these histopathological variants, and to determine inter-observer reliability in the assessment of Ki-67 labelling index by independent oral pathologists.