The advent of rare-earth screen/film combinations has brought substantial x-ray dose reductions with minimal loss in imaging quality. The physical charateristics of these recording systems are described and their potential for use in routine cephalometric studies is evaluated.
An assessment of serial postero-anterior cephalometric radiographs of 17 cleft palate patients who had undergone pharyngeal flap surgery to improve hypernasal speech; no significant effect on growth in width of dental arches or facial skeleton was found.
Attempts to produce ankylosis of deciduous teeth of monkeys by direct mechanical or chemical injury to the root, or by occlusal trauma, were unsuccessful; but luxation with no other injury did cause ankylosis.
A review of the clinical uses of bioelectric perturbation of hard tissue in medicine and dentistry is presented, along with some current research directions in the field. The authors present some of the hypotheses about the cellular mechanisms of this phenomenon.