Effect of acute glucose infusion on plasma concentrations of human growth hormone (HGH).
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Adult↗
Biomedical subjects
M Irie
Publications and source records attributed to M Irie.
Water storage effect on the marginal seal of resin-modified glass-ionomer restorations.
The effect of storage in water on the marginal adaptation of glass-ionomer restorations placed in extracted human premolars and Teflon molds was studied. When the cavity preparations were filled with a glass ionomer and polished immediately after setting, a marginal gap of approximately 15 microns was formed. In contrast, when polishing following storage in water the marginal gap was 0 to 2 microns for the resin-modified and the conventional glass ionomers respectively. The bond strength of the glass ionomer to enamel and to dentin and the flexural strength of the glass ionomer increased after storage in water. Therefore the marginal seal of glass-ionomer restorations may not only be improved due to hygroscopic expansion during storage in water but also may exhibit greater bond strength.
Dental Marginal Adaptation↗
Marginal seal of resin-modified glass ionomers and compomers: effect of delaying polishing procedure after one-day storage.
This study evaluated the effects of polishing after one-day storage in water on the marginal gap formation around fillings using three resin-modified glass ionomers, one compomer, one conventional glass ionomer, and one micro-filled composite as a control. The study also examined the marginal gap and bond strength in Teflon cavities and the flexural strength of these restorative materials, which may influence the marginal gap formation. Immediately after the setting procedure, the specimen was polished and a marginal gap of approximately 10-25 micrometers was observed regardless of the type of restorative material used. In contrast, we observed no gap or a 1-2 micrometer gap width when the specimens were polished after one-day storage. Only Dyract did not show this pattern. Statistical difference was observed between immediately polishing and polishing after one-day storage in all materials except Dyract. Hygroscopic expansion, bond strength and flexural strength play important roles in reducing the marginal gap in tooth cavities filled with two types of glass-ionomer restorative materials. In contract, these properties did not play important roles in reducing the marginal gap width for Dyract.
Chi-Square Distribution↗
Changes of body temperature and plasma corticosterone level in rats during psychological stress induced by the communication box.
BACKGROUND: We have reported that only psychological stress, but not physical stress, induces a significant elevation of body temperature following repeated exposures, however, we did not evaluate the effects of psychological stress in an acute case. In this study, we evaluated hormonal and physiological changes caused by an acute exposure to psychological stress in rats, compared to physical stress. MATERIAL AND METHODS: Adult male Wistar rats, weighing 300-400 g, were exposed to foot shock or non-foot shock stress induced by the communication box for 1 h. The rats in the foot shock group received the electrical shock directly, and the rats in the non-foot shock group could escape from the electrical shock, but received various emotional stimuli from other foot-shocked rats in the communication box. Before, during and after the exposure to each stress, we measured body temperature and motor activity by means of the telemetry system, and also measured plasma corticosterone level by radioimmunoassay. RESULTS: Non-foot shocked rats showed a significant elevation of body temperature (from 37.18 +/- 0.13 degrees C at baseline to the peak, 38.71 +/- 0.10 degrees C), in association with a slight but significant increase in motor activity, and a temporal elevation of plasma corticosterone (from 22.1 +/- 1.6 microg/dl at baseline to 29.5 +/- 2.7 microg/dl). These changes were at a lower magnitude compared to foot shocked rats. CONCLUSION: It is concluded that psychological stress, generated by the communication box, could have lower influences as an acute stress than physical stress.
Animal Communication↗
Effects of delayed polishing on gap formation of cervical restorations.
This study evaluated the effect of polishing after one-day storage in water on the gap formation around a Class V restoration completely bordered by enamel (coronal cavity) using one resin-modified glass ionomer, one compomer and one conventional glass ionomer as a control. The study also examined gap formation of these materials in two different cervical restorations-a cervical cavity incisally bordered by enamel and cervically bordered by dentin and a root surface cavity completely bordered by dentin. When the specimens of the two types of glass-ionomer material were polished immediately after the setting procedure, 100-120 gaps around the coronal restorative cavity were observed. In contrast, only 10-20 gaps were observed when the specimens were polished after one-day storage. Significant differences in the two glass-ionomer restorative materials were observed between immediate polishing and polishing after one-day storage. The compomer not show this pattern. Restorations placed in enamel/dentin and all-dentin gave results similar to those in all-enamel.
Bicuspid↗
A novel surface photo-graft polymerization method for fabricated devices.
This paper presents a new photo-graft polymerization method that permits surface modification of complex shaped devices. The principle is based on photochemistry of the dithiocarbamate group, as a polymerization initiator-transfer agent-terminator (iniferter), which is capable of photochemical dissociation into a radical pair. The procedure is as follows: first, coating of a photosensitive polymer on a substrate, and subsequent ultraviolet (UV) light irradiation in the presence of a monomer. The photosensitive polymer prepared was a radical copolymer of styrene and vinylbenzyl N,N-diethyldithiocarbamate. Surface graft polymerization of a water soluble monomer (N,N-dimethylacrylamide) on poly(ethylene terephthalate) pre-coated with the photosensitive polymer was achieved. Because the photopolymerization proceeded via a living radical polymerization, the control of molecular weight of the grafted polymer was feasible. This was quantitatively observed by graft polymerization on a quartz crystal microbalance (QCM) that can detect the weight increase with the sensitivity of ng-order. Two-dimensional patterning of cultured cells was demonstrated to show how surface grafted polymerization is limited on UV light irradiation portions with dimensionally micron order precision.
Animals↗