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The closed-tube vapour transport of chalcogenides using anhydrous aluminium chloride as transporting agent has been studied. The conditions for the transport of binary and ternary chromium, manganese, iron, cobalt and nickel sulfides and selenides are communicated. [ABSTRACT FROM AUTHOR]

Two non-metallic implant materials are introduced and the indications for their use are described. A maxillo-facial indication exists in the reconstruction of the temporo-mandibular joint and the orbital floor. We find dental-surgical indications for the Aluminium-Oxide ceramics as well as for implants in the replacement of single tooth gaps and unilateral as well as bilateral shortened dental rows. The indication in the toothless jaw is the most unfavourable and should be restricted to replacement of both canine teeth.