title: Test your diagnostic ability.
authors.forename: D H
authors.initials: DH
authors.lastname: Dean
authors.forename: C M
authors.initials: CM
authors.lastname: Reeve
authors.forename: P J
authors.initials: PJ
authors.lastname: Sheridan
mesh_terms: D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008875:Middle Aged; D010508:Periodontal Abscess / Q000175:diagnosis*; D010518:Periodontitis / Q000175:diagnosis*; D014092:Tooth Root