There is no question that in the last quarter century the work load of the executive has greatly increased. The top management man has new functions that he cannot possibly delegate completely; take, for instance, his new responsibilities in public relations and industrial relations. Businesses have grown in size, in complexity, and in geographical coverage; the duties and problems of the top e...

objective: resin cements, regardless of their biocompatibility, have been widely used in restorative dentistry during the recent years. these cements contain hydroxy ethyl methacrylate (hema) molecules which are claimed to penetrate into dentinal tubules and may affect dental pulp. since tooth preparation for metal ceramic restorations involves a large surface of the tooth, cytotoxicity of thes...

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