摘要:

Individual differences in tooth discoloration have been observed after using chlorhexidine mouth rinses. To study the correlation between retention of chlorhexidine and the discoloration tendency, two groups,‘stainers’and‘non-stainers’, were selected. The following parameters were tested: initial retention of chlorhexidine in vivo, retention of chlorhexidine to saliva-coated hydroxyapatite in vitro, and prolonged release of chlorhexidine in vivo. The initial oral retention of chlorhexidine was identical for the two groups, whereas in vitro retention of hydroxyapatite and prolonged release of chlorhexidine in vivo were higher among‘stainers’.

ISSN:0001-6357    

DOI:10.3109/00016358309162323

出版商:Taylor&Francis    

年代:1983

数据来源: Taylor

摘要:

An interview and a clinical examination of signs and symptoms of functional disturbances and diseases in the stomatognathic system were performed on 309 adolescents 15—18 years old. Relationships and differences between data from this investigation were analyzed. Statistically significant correlations were found between headaches, bruxism, and tenderness to palpation of the attachment of the temporal muscle. There were also correlations between occlusal interferences in the retruded position (RP) and clickings and between mediotrusion interferences and clickings. The occlusal interferences were correlated to tenderness to palpation of the TMJ and TMJ muscles. Young people with distal occlusal relation were more frequently conscious of symptoms from the stomatognathic system than those with neutral or mesial occlusal relation. Deep bite was correlated to clenching and frontal dental wear.

ISSN:0001-6357    

DOI:10.3109/00016358309162324

出版商:Taylor&Francis    

年代:1983

数据来源: Taylor

摘要:

The masticatory muscle activity during chewing was studied by means of electromyography (EMG) in 13 women treated with bridges supported on osseointegrated implants and compared with that in 10 dentate control subjects. The factors studied were the changes of the maximal mean voltage amplitude and the duration and coordination of activity during chewing of peanuts, bread, and apple when comparing the first three with the last three out of ten randomly selected chewing cycles. Patients with implant-supported bridges chewed with approximately the same muscle activity during the whole chewing sequence, whereas the control subjects had a reduced activity at the end of the chewing act.

ISSN:0001-6357    

DOI:10.3109/00016358309162325

出版商:Taylor&Francis    

年代:1983

数据来源: Taylor

摘要:

Ammonia and organic acids constitute a major part of the bacterial metabolites formed in carious decay. The aim of the present study was to investigate their effect on the intradental sensory nerves. Nerve impulse activity was recorded from canine teeth in cats after application of the test solutions in deep dentinal cavities. Ammonia (17—134 mM) consistently generated nerve impulses, whereas organic acids (0.001—1 M) failed to induce any impulse activity. In contrast, acid application resulted in an inhibition of the ongoing nerve activity induced by various stimuli (hypertonic NaCl solution, mechanical pulp exposure, and compound 48/80). However, acid treatment of the cavities resulted in an enhanced neural response to ammonia stimulation. Thus, the present results demonstrate that these bacterial metabolites can influence intradental sensory nerve activity. It is suggested that they may also modulate the symptoms from decayed teeth.

ISSN:0001-6357    

DOI:10.3109/00016358309162326

出版商:Taylor&Francis    

年代:1983

数据来源: Taylor

摘要:

Release of copper, zinc, and cadmium from six different amalgams in 0.9% NaCl solution has been registered during a 4-week period. The products showed widely different corrosion behavior. A dispersion-type amalgam released the smallest amounts of copper but the largest amounts of zinc. A product containing indium had a high rate of copper dissolution. Cadmium was liberated to a great extent from a copper amalgam. The rate of corrosion varied greatly for the different products during the time of the experiment. The liberation of copper and zinc was inversely correlated.

ISSN:0001-6357    

DOI:10.3109/00016358309162327

出版商:Taylor&Francis    

年代:1983

数据来源: Taylor

摘要:

In the microsomal fraction isolated from rat incisor odontoblasts, the influence of several inhibitors onp-nitrophenyl phosphatase activity (p-NPPase) was demonstrated at pH 10.3 and compared with the influence at pH 8.8. The inhibiting effect of EDTA on thep-NPPase activity was reversed by equimolar concentrations of Zn2+. The inhibitory effect of three diphosphonates, ethane-1-hydroxydiphosphonate (EHDP), methanediphosphonate (MDP), and dichloromethanediphosphonate (Cl2MDP) was equal to that of a chelating agent. Tetramisole and levamisole exerted an inhibitory effect that was different from the complexing type. l-Cystein, but not l-ascorbic acid, inhibitedp-NPPase activity with a maximum inhibitory effect at pH 10.5.

ISSN:0001-6357    

DOI:10.3109/00016358309162328

出版商:Taylor&Francis    

年代:1983

数据来源: Taylor

摘要:

Gingival sulcular epithelium—-which in primates normally does not keratinize—-can be induced to undergo keratinization by prolonged intensive antibacterial therapy. Three months before biopsy the teeth of two adult male rhesus monkeys were scaled and polished, and for 5 days the monkeys were given intravenous injections of 75 mg Achromycin®daily. Their teeth were subsequently subjected to daily cleaning and polishing. The presumably in-situ-keratinized sulcular epithelium was examined by transmission electron microscopy. It was also compared with oral gingival epithelium from the same two animals and with oral and sulcular epithelium from a rhesus monkey that had not been exposed to local or systemic antibacterial therapy. The results confirmed earlier histological studies, which have shown that under the conditions described the sulcular epithelium becomes parakeratinized. In addition, several other ultrastructural changes were observed, some of which suggest that the treatment given may result in the formation of a more efficient permeability barrier in the sulcular area. The possible clinical significance of such a barrier is briefly discussed.

ISSN:0001-6357    

DOI:10.3109/00016358309162329

出版商:Taylor&Francis    

年代:1983

数据来源: Taylor

摘要:

In vitro, conventional, microfilled and experimental composite resin specimens were subjected to toothbrush-dentifrice abrasion. Subsequently, height loss was recorded, and the appearance of the abraded surfaces was studied by light and scanning electron microscopy. In the experimental composite, which had a polymer-impregnated porous glass filler, the glass phase showed flat surfaces. These surfaces were more smooth and lustrous than the surrounding resin. They also showed a rounding-off in the periphery. In the experimental composite smoothness and luster were therefore favored by the presence of large continuous areas of glass in the surface. It was possible to demonstrate the extension of the flat glass areas by the use of optical microscopy. In the conventional composite partly exposed irregular or rounded glass particles were frequent. A microfilled composite showed, except for frequent pores, a relatively smooth and lustrous surface. The wear rate of this material was, however, comparatively high.

ISSN:0001-6357    

DOI:10.3109/00016358309162330

出版商:Taylor&Francis    

年代:1983

数据来源: Taylor

摘要:

This article deals with blood flow and tissue pressure changes in the inflamed dental pulp. While detailed patho-physiological studies of the circulation in the inflamed pulp are still partly lacking, available data from studies of the normal pulp tissue are also discussed. Knowledge of the normal physiological adjustments may indicate which circulatory changes would take place during inflammation. One of the focal points in the present article is how a localized increased tissue pressure may persist in the inflamed area without a circumferential spread to the rest of the pulp. The article is organized in the following manner: First a short review is given of the vascular changes during inflammation in general. Then available data from morphological and functional studies of the pulpal circulation are treated in some detail. Particular attention is given to the transcapillary fluid flow and the so-called‘self-strangulation theory’. The effect of a localized increased tissue pressure on pulpal blood flow is thereafter discussed.

ISSN:0001-6357    

DOI:10.3109/00016358309162331

出版商:Taylor&Francis    

年代:1983

数据来源: Taylor