title: A case of orthokeratinized odontogenic cyst suspected to be a radicular cyst.
abstract: This report describes a case of orthokeratinized odontogenic cyst arising in the mandibular molar region of a 39-year-old man. Under the initial clinical diagnosis of radicular cyst, root canal treatment was performed on the mandibular right second molar. The treatment that continued for six months did not achieve healing. Subsequently surgical intervention was selected since the tooth fracture was found, and the prognosis was judged to be poor. After atraumatic tooth extraction, the apical cystic lesion was enucleated, and the tooth was replanted. A definite diagnosis of orthokeratinized odontogenic cyst was made by histopathological examination of the biopsy specimen. The radiograph taken seven months after the operation showed an improvement in the radiolucent lesion. No clinical signs of tooth mobility, pain, and swelling were present. The tooth was then successfully retained with the final restoration. Careful follow-up is needed in order to detect any signs of recurrence.
authors.affiliation: Division of General Dentistry, Department of Clinical Oral Health Science, Tokyo Dental College, Chiyoda-ku, Tokyo, Japan. onukim@tdc.ac.jp
authors.forename: Mizuho
authors.initials: M
authors.lastname: Onuki
authors.forename: Atsushi
authors.initials: A
authors.lastname: Saito
authors.forename: Sohei
authors.initials: S
authors.lastname: Hosokawa
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Ohnuki
authors.forename: Hiroki
authors.initials: H
authors.lastname: Hayakawa
authors.forename: Shuichi
authors.initials: S
authors.lastname: Seta
authors.forename: Takashi
authors.initials: T
authors.lastname: Muramatsu
authors.forename: Masahiro
authors.initials: M
authors.lastname: Furusawa
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008336:Mandibular Diseases / Q000175:diagnosis* / Q000601:surgery; D009807:Odontogenic Cysts / Q000175:diagnosis* / Q000601:surgery; D011842:Radicular Cyst / Q000175:diagnosis*; D012390:Root Canal Therapy; D014082:Tooth Fractures / Q000601:surgery; D014090:Tooth Replantation; D014092:Tooth Root / Q000293:injuries; D017211:Treatment Failure; D016896:Treatment Outcome