224Ra-induced dental resorptions: Report of a case

Abstract Multifocal external-internal resorptions were observed in a 55-year-old female patient who had received a series of intra-articular injections of a preparation containing 8 to 70 μCi of thorium X ( 224 Ra) for treatment of tuberculosis of the right knee. Radiographic, γ-spectroscopic, and histologic findings are described and compared to previously reported cases of 224 Ra- and 226 Ra-caused dental resorptions. Specific radiation-induced osseous and periodontal inflammatory changes must be considered as a probable etiologic factor.