摘要:

An epidemiological study was performed in 250 persons who five years previously had been treated with extensive metallic reconstructions.To gain representative information these persons were selected at random from three Local Social Insurance Offices in different parts of Sweden.Those person, who in a questionnaire reported symptoms that could be alleged to have been caused by oral galvanic actions, were offered free clinical examination including quality evaluation and free measurements of potentials and polarizations of the metallic dental restorations.Persons from a subgroup to this study not suffering from any oral discomforts were chosen as a control group.Comparisons between the two groups were made in regard to current creation at metallic contacts, clinical quality and mucosal conditions.In none of the statistical analyses performed, differences could be shown between the groups. A tendency to higher amounts of restorative care at comparatively lower level of technical quality could, however, be noticed in the group of persons with oral symptoms which they themselves associated with oral galvanism.

ISSN:0001-6357    

DOI:10.3109/00016358209025111

出版商:Taylor&Francis    

年代:1982

数据来源: Taylor

摘要:

Microstructure characterization of silicate and glass ionomer cements has been carried out using, SEM, EDAX and ion microprobe techniques. The distribution of aluminum, calcium, fluorine, phosphorus or silicon was measured in the set cement surfaces.Cracks in the cement specimens produced by mechanical breaking, in contraction during setting, or as a result of SEM preparation were observed to occur mainly in the matrix and in the interface between matrix and particle. Powders of silicate and glass ionomer cements were separated into various fractions using sieves or cyclone separation technique. Compressive strength measurements ot specimens made ot powders with various size distributions have been assessed. The fractionation did not reveal any strong effect on the compressive strength properties either for the silicate or the glass ionomer cement.

ISSN:0001-6357    

DOI:10.3109/00016358209025112

出版商:Taylor&Francis    

年代:1982

数据来源: Taylor

摘要:

Biopsies from 13 oral leukoplakias and from normal tissue specimens in the contralateral region of each patient were examined microradiographically and lipid-histochemically using freeze-sectioned and freeze-dried sections. The investigation showed that an epithelial zone of cell layers with different degrees of keratinization and varying dry mass concentrations occurred in oral leukoplakias. A concentrated localization of phospholipids, free fatty acids and cholesterols was found in the zones with a high dry mass content and, consequently, high keratin content, while a negative lipid reaction was obtained in the zones where the dry mass concentration was low.

ISSN:0001-6357    

DOI:10.3109/00016358209025113

出版商:Taylor&Francis    

年代:1982

数据来源: Taylor

摘要:

Nine patients with pemphigus vulgaris and one with pemphigus vegetans were studied. All ten patients had oral lesions, five of them skin involvement as well. The patients were followed up for variable periods at different intervals. At each visit, their clinical condition was assessed as mild, moderate, severe or remissive. At examinations, oral light microscopical smears and blood samples for indirect immunofluorescence were taken. From one patient with pemphigus vulgaris, smears from skin blister fluid were also studied. The highest intercellular antibody titers were found in severely affected patients, and those at the mild stage of the disease usually gave low or negative titers. A correlation between the number of acantholytic cells in smears and the clinical condition of the patient was usually found: improvement of the clinical state was followed by decreased numbers of acantholytic cells.Acantholytic cells were rounded or ovoid, having an enlarged, hyperchromatic, centrally or eccentrally situated nucleus. The cytoplasm was usually eosinophilic.Neutrophilic polymorphonuclear leucocyte/acantholytic cell rosettes were sometimes seen in the smears, as well as eosinophil/acantholytic cell rosettes. Variable numbers of leucocytes (from 3 to 11) were seen surrounding the acantholytic cell.Both binucleated epithelial and acantholytic cells and multinucleated giant cells were found in the smears. Multinucleated giant cells were sometimes seen engulfing cells resembling acantholytic cells.

ISSN:0001-6357    

DOI:10.3109/00016358209025114

出版商:Taylor&Francis    

年代:1982

数据来源: Taylor

摘要:

Hietanen, J.&Lounatmaa, K. Freeze-fracturing of oral epithelial cells in pemphigus,Acta Odontol. Scand. 1982, 40, 415–420Biopsies from the oral mucosa of three patients (two with pemphigus vulgaris and one with pemphigus erythematosus) were taken for both freeze-fracturing and thin-sectioning studies. Oral mucosa from a clinically healthy volunteer was used as control. The samples collected from both the involved and uninvolved oral mucosa of pemphigus patients showed widened intercellular spaces and fewer than normal desmosomes. Thin sections showed a random distribution of tonofi-laments. However, in freeze-fracture replicas tonofilaments were arranged in thick bundles with a slightly coiled orientation. In freeze-fracture replicas of samples from a pemphigus patient in remission no difference was found in the number of particles on both fracture faces.

ISSN:0001-6357    

DOI:10.3109/00016358209025115

出版商:Taylor&Francis    

年代:1982

数据来源: Taylor

摘要:

A morphologic trait, not previously registered, on the incisor lingual surface:«The lingual angle of incisors», was studied in Norwegians. The lingual angle is the angle between the floor of the lingual fossa and the dental tubercle. Measurements of the lingual angle could be performed with sufficient accuracy. Deviations from normal distribution in skewness and kurtosis values did not affect statistical testing. The general similarity of the frequency polygons forall incisors in the way they were peaked and stepped is possibly due to participation of the same factors on the genetic level in the determination of the trait. The mean lingual angles were (in degrees): 11sup = 142, 12sup = 156, 11inf = 153 and 12inf = 154. No significant bilateral asymmetry or sex differences were found. Correlations were high for both central to central and lateral to lateral incisors in both jaws, highest for centrals in the maxilla and laterals in the mandibula. Central to lateral correlations were relatively low, especially in the upper jaw. Interjaw correlations were low, but 11sup showed a tendency to be better correlated than 12sup to lower incisors, 12sup and 11inf were the most variable incisors in each jaw. The dental tubercle probably plays an important role in determining the lingual angle. Measurements of the lingual angle give information on the profile of the lingual surface in inciso-cervical direction. Statistical analysis of a pheno-typic trait may give information on factors which determine the trait.

ISSN:0001-6357    

DOI:10.3109/00016358209025116

出版商:Taylor&Francis    

年代:1982

数据来源: Taylor

摘要:

A system for continuously quantifying of jaw movements in terms of jaw angle was tested in combination with a previously tried method for simultaneous recording of temporomandibular joint (TMJ) sounds and electromyographic (EMG) activity. The system was used to measure the degree of rotation of the lower jaw in the sagittal plane in relation to the upper jaw. It was tested on a group of healthy subjects and patients with TMJ clicking and found useful to record EMG activity and TMJ clicking in relation to opening degree and velocity of jaw movement in open-close cycles.

ISSN:0001-6357    

DOI:10.3109/00016358209025117

出版商:Taylor&Francis    

年代:1982

数据来源: Taylor

摘要:

The effect of media with different osmolalities and compositions on cell viability and intergrity of the cell membrane has been studied. Physiologic media, such as milk, saline and physiologic sucrose solution, preserved cell viability and membrane morphology equally well. The cell membrane of cells stored in saliva was more extensively damaged than the cell membrane of cells stored in a sucrose solution with an hypotonic osmolality similar to saliva. Thus a hypo-tonic osmolality seemed to potentiate the damaging effect of an unfavourable composition or a bacterial contamination of the storage media.

ISSN:0001-6357    

DOI:10.3109/00016358209025118

出版商:Taylor&Francis    

年代:1982

数据来源: Taylor

摘要:

This histochemical study showed that experimentally arteriosclerotic rats, subjected to an occlusal stress of six weeks’duration, showed an inflammation-related increase of chloride-activated arginine aminopeptidase and acid phosphata-se activity in the basal cells of the gingival epithelium. The activity of chloride-activated arginine aminopeptidase and acid and alkaline phosphatase in the gingival connective tissue was slight and suggestive of chronic inflammation. Biochemical comparison of gingival specimens from the stressed and unstressed sides of the jaw in the experimental animals failed to reveal any difference in the rate of N-L-arginyl-2-naphthylamide hydrolysis induced by the Cl-ion in connection with occlusal disorder. On the other hand, the mean value of the enzyme activity was lower in the experimental animals than the controls (p<0.5). The difference was assumed to be associated with degenerative tissue changes. The hydrolysis of p-nitrophenyl phosphate at acidic and alkaline pH in the gingiva was higher in the experimental animals than in the controls, and in the alkaline pH range the difference between the mean values was statistically significant (p<0.01). This finding, which may be associated not only with gingival inflammation but also with other tissue changes, requires further investigation.

ISSN:0001-6357    

DOI:10.3109/00016358209025119

出版商:Taylor&Francis    

年代:1982

数据来源: Taylor

摘要:

The susceptibility of a tooth to dental caries has been proposed to depend on tooth color. So far there has, however, been no reliable method for tooth color determination. The aims of this study were to evaluate the reliability of an opto-electronic method and to examine the relationship between tooth color and past caries experience. The color of upper right central incisors of 64 schoolchildren was determined using an opto-electronic tri-stimulus color comparator. The intra-and interexaminer reliability of the method was evaluatedin vitroandin vivobeing 85% and 83%, respectively. To assess the past caries experience the DMFS-index was calculated. Oral hygiene and dietary habits were also assessed. No significant difference in DMFS scores was obtained between the‘white teeth’group and the‘yellow teeth’group. The conclusion is, that the practical importance of possible colorrelated differences in caries resistance is negligible due to the multifaceted nature of dental caries.;

ISSN:0001-6357    

DOI:10.3109/00016358209025120

出版商:Taylor&Francis    

年代:1982

数据来源: Taylor