title: Long-term occlusal guidance of a severely intoxicated patient with yusho (PCB poisoning): a case report.
abstract: The peculiar dentoorofacial characteristics and 12 years of interdisciplinary management of a patient who was severely intoxicated with the man-made chemical polychlorinated biphenyls (PCBs) are described in this case report. Cephalometric measurements showed that the SNA and SNB angles were reduced but that the developments in height and skeletal maturity were in normal ranges. Gingival hyperpigmentation that was caused by high blood PCB concentration was extremely slow to fade. A cystic mass, diffused trabeculae, and irregular calcification, which were shown on the radiograph and which were caused by high blood levels of PCB, changed gradually. However, the patient had periodontal disease because of horizontal alveolar bone resorption and a deep periodontal pocket, despite good plaque control. After the PCB poisoning the tooth roots were hypoplastic and dilacerated. One root was extracted because of chronic periodontitis. Some teeth were impacted, malposed, or ankylosed.
authors.affiliation: Faculty of Dentistry, Kyushu University, Fukuoka, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Shimizu
authors.forename: S
authors.initials: S
authors.lastname: Nakata
authors.forename: T
authors.initials: T
authors.lastname: Murakami
authors.forename: K
authors.initials: K
authors.lastname: Tamari
authors.forename: Y
authors.initials: Y
authors.lastname: Takahama
authors.forename: A
authors.initials: A
authors.lastname: Akamine
authors.forename: M
authors.initials: M
authors.lastname: Aono
mesh_terms: D000293:Adolescent; D000328:Adult; D000844:Ankylosis / Q000139:chemically induced / Q000628:therapy; D002648:Child; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D009971:Orthodontics, Corrective; D010510:Periodontal Diseases / Q000628:therapy; D011078:Polychlorinated Biphenyls / Q000506:poisoning*; D014071:Tooth Abnormalities / Q000139:chemically induced; D014076:Tooth Diseases / Q000139:chemically induced* / Q000628:therapy*; D014078:Tooth Eruption; D014086:Tooth Mobility / Q000628:therapy; D014087:Tooth Movement Techniques; D014092:Tooth Root / Q000002:abnormalities; D014095:Tooth, Impacted / Q000139:chemically induced / Q000628:therapy
chemical_list: D011078:Polychlorinated Biphenyls