摘要:

Abstract–Sixty female Wistar rats were injected with tritiated thymidine and killed at intervals between 1 hr and 72 hr after injection. Autoradiographs of paraffin and Vestopal W embedded sagittal sections of the maxillary incisors were prepared. The distribution of labeled cells after 1 hr revealed the basal pulp cells and the preodontoblasts as proliferative cells. The growth rate of the incisor and the migration of the basal pulp cells were established from the position of labeled cells at 72 hr observation time. The number and localization of labeled and unlabeled mitoses were registered in order to determine the duration of the generation cycle of the proliferative cells. The identical cell generation time of preodontoblasts and basal pulp cells and the migration pattern of the latter indicate that the preodontoblasts are renewed by preodontoblast multiplication and not by migration of basal pulp cell

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00826.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –Activity of acid phosphatase and β‐glucuronidase was shown in bovine preodontoblasts and preameloblasts prior to the onset of secretion. In the preameloblasts the rather weak reaction consisted of small discrete granules dispersed in the cytoplasm apical, lateral, and proximal to the nucleus. After initiation of enamel formation, a change in localization and intensity of the colored reaction product was observed in the ameloblasts. The activity appeared stronger and was restricted to a narrow zone just apical to the nucleus. It is proposed that the acid hydrolases in the tooth forming cells are located to the Golgi complex. The differences in activity of acid hydrolases between bone and tooth forming cells are expou

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00827.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –Hydroxyapatite treated with fluoride containing both alkali soluble fluoride (CaF2) and alkali stable fluoride (FAp) was shown to take up less albumin than hydroxyapatite but more lysozyme. The affinity of the adsorption of albumin to fluoride treated apatite was increased, whereas no difference was demonstrated in the affinity of lysozyme. Tooth surfaces in vivo contain both calcium fluoride and fluoroapatite. Protein adsorption to mixed phases may thus have clinical significanc

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00828.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –The possible influence of continuous exposure to selenium on dental caries and gingivitis was examined during a clinical trial of selenium administration to patients suffering from a progressive encephalopathy, Spielmeyer‐Sjögren's disease. The study group consisted of eight children (mean age 12.5 years) and a control group of the same age and size from the same institution. DMFS‐ and Gingival Bleeding Indices were recorded at the onset of the selenium medication and thereafter once a year. No difference in the caries incidence or in the prevalence of gingivitis between the two groups could be shown during the follow‐u

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00829.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –IgG and IgA were demonstrated in both sub‐ and supragingival dental calculus. Their distribution followed mainly incremental lines in the calculus. Most likely they originated from saliva and gingival fluid. Immunoglobulins which are adsorbed to crystals in biologic tissues may slow down the growth rate of the crystals. It was thus suggested that the incremental lines may be caused by the accumulation of IgG and IgA on the surface of dental calculus with a subsequent arrest in gro

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00830.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –Supragingival plaque samples were examined for α‐amylase activity before and after cultivation. Amylase activity was determined by disappearance of14C‐labeled starch in a phosphate buffer, pH 6.9. In all plaque samples α‐amylase activity was observed. On an average 75% of this activity was soluble, while the rest was bound to various plaque components. Known inhibitors of human α‐amylase inhibited the enzyme activity in the plaque samples almost totally. The electrophoretic patterns of α‐amylases in the plaque and human saliva samples were identical. Bacteria cultivated from the plaque samples showed no or low α‐amylase activity. The results indicated that most of α‐amylase activity in supragingival plaque samples are of salivary origin. The greater part of the enzyme activity is extracellular in the plaque, may be located at the plaque surface, and only a minor part is bound to the cells or to the insoluble com

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00831.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –Fifty‐five 15‐yr‐old Brazilian students were selected on the basis of presence or absence of radiographic bone loss. One hundred and fourteen sites were selected, representing areas with and without bone loss, with varying degrees of inflammation and pocket depths. The association between the parameters were evaluated on a site by site basis. Areas with deep pockets more often showed severe inflammation and bone loss than did areas with shallow pockets. However, deep pockets often occurred where no bone loss could be detected radiographically. In this age group clinical assessments seem to overestimate the prevalence of destructive periodontitis, and should be supplemented with radiographic examination for screening purposes and for identification of risk s

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00832.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –A Double‐blind clinical trial with cross‐over was conducted for a period of 12 months in 25 patients with recurrent aphthous stomatitis (RAS). The effect of the amyloglucosidase and glucoseoxidase containing Zendium toothpaste on the discomfort, number of exacerbations, duration of exacerbation, number of ulcers and number of days with pain caused by RAS was studied. The use of Zendium significantly reduced the sensation of discomfort from RAS as compared to the use of placebo toothpaste (0.025>p>0.01). However, the patients were unable to discriminate significantly between Zendium and placebo when asked to choose one of the toothpastes (0.10>p>0.05) and no significant differences were demonstrated as far as the above mentioned parameters of disease serverity were concerned. Therefore, it is concluded that the reducing effect of Zendium containing amyloglucosidase and glucoseoxidase on RAS is weak as compared to a similar toothpaste without these en

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00833.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –Enzyme histochemical techniques were used as markers of macrophage activity and differentiation in the periodontal tissues following orthodontic tooth movement in man. The enzymes studies included lactate dehydrogenase, glucose‐6‐phosphate dehydrogenase, succinic dehydrogenase, acid phosphatase and its tartrate resistant isoenzyme, arylsulfatase, aminopeptidase M and prostaglandin synthetase. Chloroacetyl esterase activity was studied in order to detect possible neutrophilic degrading activity. Intense activities of arylsulfatase and prostaglandin synthetase and a moderate activity of aminopeptidase M were found in cells degrading the hyaline zone. However, no activity of tartrate resistant acid phosphatase was found in these cells. Giant cells in contact with bone surfaces adjacent to the hyaline zone exhibited an intense activity of succinic dehydrogenase, tartrate resistant acid phosphatase and aminopeptidase M. Chloroacetyl esterase activity did not change following orthodontic treatment. The results indicate that macrophages in various stages of differentiation were responsible for the degradation of the hyaline zone and alveolar bone during orthodontic tooth movement. The enzymatic differences were probably due to the influence of the immediate cellular environment. Prostaglandin synthetase activity, which may be interpreted as a sign of prostaglandin secretion, was associated with the degradation of the hyaline zone i

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00834.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –Central bearing point and visual methods were used in the study of repeated recordings of occlusion in 30 patients with old complete dentures. The results were classified into di‐ and trichotomous categories. Intra‐ and interexaminer variability were generally high. In addition, significant differences were found between the examiners in the level of recording denture occlusion. The use of trichotomous categories increased the variability to an unacceptable level. The variability with the central bearing point method was higher than with the visual method. However, occlusal discrepancies were found with significantly higher frequencies with the central bearing point method than with the visual m

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00835.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY