hiceram and marginal gingiva a clinical study the past few years have seen great efforts in prosthodontics to find a way of replacing the metal portion necessary in the construction of ceramic veneer crowns by nonmetallic anorganic materials as a result various novel procedures for the production of fully mineral crowns have been developed among these the hiceram system has attained particular attention in a clinical study the reactions of the marginal gingiva to hiceram have been compared to those to ceramometallic crowns treatment of gonorrhoea with single oral doses of rifampicin of 103 cases of acute uncomplicated gonorrhoea treated with single oral doses of 900 mg of a new antibiotic rifampicin 89 were followed and 10 112 apparent failures were foundrifampicin gives results which compare favourably with those obtained under like conditions with similar doses of other orally administered antibiotics it provides an alternative means of singlesession therapy for patients in whom penicillin is contraindicated