Restoration of mandibular continuity defects using combinations of hydroxylapatite and autogenous bone: microscopic observations.

The purpose of this investigation was to assess by light, transmission, and scanning electron microscopy the healing of mandibular continuity defects reconstructed with varying ratios of an alloplastic hydroxylapatite implant material (HA) mixed with autogenous bone (AB). This study reports the microscopic observations of implant and control sites at 6 and 18 months postsurgery. The results confirm the biocompatibility of dense HA granules.

Increased intracellular levels of beta-glucuronidase in polymorphonuclear leucocytes from humans with rapidly progressive periodontitis.

The tissue destruction resulting from release of lysosomal enzymes by exocytosis and degranulation of polymorphonuclear leucocytes in host gingiva may contribute significantly to periodontal diseases. In this investigation peripheral blood was obtained from healthy controls and otherwise healthy individuals with rapidly progressive periodontitis. Polymorphonuclear leucocytes were isolated and suspended in HBSS for subsequent in vitro FMLP challenge to induce degranulation.

The effectiveness of a leadup activity on performance in an operative preclinic laboratory course.

Preclinical technique curricula seldom provide training in those prerequisite skills that may facilitate performance in a large class of procedures. Instead, students typically progress from simple to increasingly difficult preparations and it is assumed that positive transfer occurs between them. Another strategy that may provide greater benefits is the leadup activity, which closely simulates the criterion tasks, but eliminates one or more complexities thought to interfere with prerequisite skill acquisition.

A theory of motor performance and its applications to preclinical dental skill acquisition.

This article reviews one theory of motor performance that was derived from a large body of research findings. The validity of any theory depends on the extent to which it can generate testable hypotheses. Based on a number of applied investigations in the preclinical setting, several predictions developed from this theory have been supported.

Infection control in dental school radiology.

U.S. and Canadian dental schools were surveyed concerning infection control practices in dental radiology.

Effect of experimental stress on masseter and temporalis muscle activity in human subjects with temporomandibular disorders.

Temporomandibular (TM) disorders have an uncertain aetiology. The purpose of this study was to replicate and extend the work of Yemm (1969) (Archs oral Biol. 14, 873-878, 1437-1439; Br.

The reliability and agreement of subtask assessments.

Knowledge of results (KR) for subtasks is an important type of error information for students, since it is related to a particular sequence of movements. Students' attempts to correct movement errors may be hindered when the KR provided by different instructors is not consistent. This investigation evaluated the effectiveness of a training program designed to improve interrater agreement and reliability of assessments for subtasks.

The effect of knowledge of the desired outcome on dental motor performance.

Knowledge of the desired outcome of a series of movements is a critical component of motor performance, since it is used to develop the appropriate motor program and to form a basis for understanding terminal extrinsic feedback and formulating subjective reinforcement. In dentistry, information about the desired outcome is almost always disseminated in a lecture and laboratory manual, and a demonstration often is provided. However, mastery by students usually is not given the importance it deserves.