[In vitro demonstration of polymerization retraction of composites by capillary penetration phenomenon].
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Biomedical subjects
Publications and source records attributed to Y Caux.
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The authors report five new cases associating basal cell epithelioma and multiple Pinkus fibro-epithelial tumors on the spine after radiation damage to the skin. One of them had previously published three similar observations: so his experience refers to eight cases. The authors recall similar cases of the literature, they discuss the relations between basal cell epitheliomas and Pinkus premalignant fibro-epithelial tumors of the skin. Histologically they saw several aspects of transition between the two types of tumors. They study the patterns of cancers found after radiation therapy, influence of type of radiations, dose, age, and intervals since X-rays. As regards such cases, the necessity of systematically searching for previous radiations by X-rays in the affected zone is emphasized.
When large restorations are necessary, self screw-cutting dentinal pits are very useful auxiliaries. The main risks encountered during their utilization are: --perforation through periodontium--pulpal wound--dentinal cracks--weakness of mechanical properties of restorative material--corrosion--breakdown of the drill--pulpal warning up--unesthetical front restorations. The way to prevent those difficulties are: --precise clinical and radiological examinations--insertion point--direction--number--composition--choice of pits.
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