statement of problem: due to the growing popularity of vital bleaching by carbamide peroxide it is imperative to understand the effect of such agents on enamel and dentine. purpose: the purpose of this study was to evaluate the effect of a 16% carbamide peroxide bleaching gel; vivastyle on enamel staining susceptibility. materials and methods: thirty bovine specimens were selected and randomly ...

1. Staining and culture. Current methods of specimen staining and culture used for M. tuberculosis are acceptable for most NTM species. The preferred methodology includes fluorochrome staining and culture in a liquid medium as well as on Middlebrook 7H10 or 7H11 agar. Species for which special growth conditions are needed include those responsible for cutaneous disease, which need lower incubat...