Biomedical subjects
Publications and source records attributed to S E Powell.
The authors provide a pictorial review of technical errors in endodontic instrumentation. Examples of separated instruments, abrupt constriction, laceration, canal transportation, and control zone errors are provided. The potential problems and effect on prognosis associated with these errors are explained.
Apical closure of nonvital teeth can be achieved by appropriate endodontic intervention. A case is reported in which apical maturation appears to have occurred without treatment and in the presence of sporadic drainage from a sinus tract stoma.
Sodium hypochlorite is a useful adjunct to endodontic therapy but it must be confined to the root canal. A case of periapical injection of hypochlorite with untoward sequellae is presented.
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A 20-year-old patient with hyperimmunoglobulin E and abnormal leukocyte chemotaxis was treated by synovectomy for chronic and recurrent staphylococcal knee pyarthrosis. The articular cartilage was noted to be preserved despite the severity of synovial involvement and the chronic nature of this case of septic arthritis. Polymorphonuclear leukocytes were few, despite florid Staphylococcus aureus growth. This observation lends support to the role of lysozomal enzyme activity from leukocytes in hyaline cartilage damage in pyarthrosis.