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Biomedical subjects

J M Leary

Publications and source records attributed to J M Leary.

27 records · Page 2Linked to original sources
PubMed1985

Die recovery technique.

A separating disk is used to make proximal cuts and cuts on the underside surface of the cast. The dies can be recovered without damage to the margins.

Denture Design↗
PubMed1975

The effects of verapamil and paired-pulse stimulation on mammalian ventricle.

Postextrasystolic potentiation induced by paired-pulse stimulation was studied in mammalian ventricle muscle in the presence of verapamil (0.2-4.0 muM). Verapamil exerts a negative inotropic effect on the potentiated contraction, but the force of the potentiated contraction in the presence of verapamil is greater than that of the normal, unpotentiated contraction in the absence of verapamil. The positive inotropic effect of paired stimulation appears to result both from an additional calcium influx appearing as a calcium current during the plateau of the premature action potential and from some additional mechanism, tentatively identified as a Na: Ca exchange. Our results suggest that paired-pulse stimulation could be used clinically to counteract the negative inotropic effects of verapamil; moreover, the antiarrhythmic action of verapamil might counteract any arrhythmias caused by paired pacing.

Animals↗
PubMedDate not supplied

In vitro investigation of the wear of resin composite materials and cast direct retainers during removable partial denture placement and removal.

The purpose of this study was to determine whether wear of two resin composite materials and contacting I-bar clasp tips would occur within a simulated RPD placement and removal period of 2 years. The data were compared to enamel with contacting I-bars. Cast I-bar clasps were passed over each specimen in the resin composite and tooth experimental groups (n = 10). Computer digitized image analysis of SEM photomicrographs of the specimens provided data for analysis of wear. Results indicated a statistical difference in the amount of mean wear between the two resin composites and between the I-bar groups. The results from this study suggest that the selection of a resin composite for use as a RPD retentive undercut must be carefully undertaken to avoid excessive wear and loss of retention.

Analysis of Variance↗
PubMedDate not supplied

Post and core retention with different cements.

In this study, bond strengths of four cement systems--Comspan resin composite luting cement with and without Gluma dentin bond, Fleck's zinc phosphate cement, and Ketac-Cem glass ionomer--used in cementing cast post-cores were investigated. Gluma appears to enhance the bond at the post/tooth interface, resulting in decreased variability and increased strength.

Analysis of Variance↗