Poster 17: Immunohistochemical Study of the Lining Epithelium in Keratocystic Odontogenic Tumor, Orthokeratinized Odontogenic Cyst, Dentigerous Cyst, and Radicular Cyst

Abstract

Statement of the Problem: Lining epithelium of odontogenic keratocysts is divided into parakeratosis and orhtokeratosis. WHO classified odontogenic keratocyst with parakeratosis as keratocystic odontogenic tumor (KCOT) in 2005. And odontogenic keratocyst with orthokeratosis was not classified as odontogenic tumor, though it is also referred to as orthokeratinized odontogenic cyst (OOC). In order to clarify the characteristics of each lesion, we investigated the immunohistochemical expression of cytokerachin (CK) in KCOT, OOC, dentigerous cyst (DC) and radicular cyst (RC).