Metal ceramic restorations were considered the gold standard as reliable materials. Increasing demand for esthetics supported the commercialization of new metal free restorations. A growing demand is rising for zirconia prostheses. Peer-reviewed articles published till July 2013 were identified through a Medline (Pubmed and Elsevier). Emphasizing was made on zirconia properties and applications...

A recent article in TREE [1] presented a heavily documented review of experimental evolution, addressing three major issues: main questions and applications; experimental design and study systems; and caveats and limitations. Here, we comment on the latter issue. The soundness of a scientific method depends on not only its adequacy relative to the specific goals, but also the relative suitabili...

Academics and practitioners interact on the basis of formal informal mechanisms. This article examines these mechanisms as opportunities for collaboration, identifies their key strengths weaknesses, discusses threats that make academia a sensitive ground exploitation. The first section is focused contributions to intelligence profession organized around primary functions identified in cycle. se...