title: Allergic palmoplantar pustulosis caused by cobalt in cast dental crowns: a case report.
abstract: Cobalt chrome alloy is a common material in prosthodontic restorations; however, instances of palmoplantar pustulosis owing to cobalt allergy are rare. Here, we report an unusual case of palmoplantar pustulosis in the hands and feet of a 58-year-old male patient caused by a cobalt allergy. The patient developed palmoplantar pustulosis characterized by redness, pustules, vesicles, and scaly erythema on his hands and feet 1 month after obtaining cobalt chromium alloy cast crowns on his molar teeth. The symptoms persisted for 1 year. He underwent standard patch testing, which showed a strong positive reaction to cobalt chloride. After the crowns were removed, the symptoms disappeared in 3 weeks. This study may serve to remind dental practitioners to be aware of potential allergic reactions to dental materials used in prosthodontic treatment and to enable them to recognize a metal allergy if it appears.
authors: School of Stomatology, the Fourth Military Medical University, Xi'An, China.
authors: Hong
authors: H
authors: Song
authors: Wen
authors: W
authors: Yin
authors: Qin
authors: Q
authors: Ma
mesh_terms: D003035:Cobalt / Q000009:adverse effects*; D003442:Crowns / Q000009:adverse effects*; D003722:Dental Alloys / Q000009:adverse effects*; D003793:Dental Restoration, Permanent / Q000009:adverse effects; D017449:Dermatitis, Allergic Contact / Q000209:etiology* / Q000473:pathology; D020878:Device Removal; D006801:Humans; D006967:Hypersensitivity / Q000209:etiology / Q000473:pathology; D008213:Lymphocyte Activation; D008297:Male; D008875:Middle Aged; D010328:Patch Tests; D011565:Psoriasis / Q000209:etiology* / Q000473:pathology
chemical_list: D003722:Dental Alloys; D003035:Cobalt; C018021:cobaltous chloride