Endodontic treatment of the old tooth.
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UNLABELLED: Different types of cavities were prepared in 96 model teeth: simple preparations without ledges and with Amalgapins, slots or a post; proximal box preparations with an occlusal ledge, and box preparations with or without Amalgapins or slots. The amalgam fillings were subjected to axial load by means of a Zwick machine until the filling or the tooth fractured. RESULTS: --Occlusal ledges and box preparations allow high load values. --Surprisingly high loads can be placed on simple preparations without ledges but with a post. --Preparations without ledges but with Amalgapins or slots rate lowest. --In box preparations and preparations with ledges, Amalgapins or slots fail to offer any significant increase in compressive strength.
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The Authors report some clinical cases treated with orthodontic forced eruption, periodontal surgery and prosthetic rehabilitation. The theoretic first part of this work was published on Dental Cadmos no. 9/87.
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Twenty-five years after treatment with thorium X (Ra 224), we found unusual, multifocal dental resorptions in four patients. The results of gamma-spectrographic, auto-radiographic and histological examinations suggest that Ra 224 caused such changes.
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