摘要:

Abstract –A previously described method in which mature rat mast cells stained with acid dyes were demonstrated by their selective fluorescence, was further studied. The material consisted of tongues from rats and mice in addition to heads and tails from 1‐d‐old rats and embryos 19 d post gestation stage. Chronically inflamed human gingiva obtained from gingivectomies was also studied. Some basic dyes were used for control and comparison. With the acid dyes acid fuchsin, fast green FCF and azocarmine G a mast cell fluorescence equal to that in rats was also demonstrated in mice and humans. Immature rat mast cells stained with acid dyes disclosed a selective fluorescence, the intensity of which was, however, lower than that observed with the basic dye acridine orange. Immature mast cells in the chronically inflamed gingiva revealed a fluorescence of lower intensity than that emitted by the mature cells. In mature mast cells from rats and mice the fluorescence color induced with acid dyes except for thiazine red R, was dependent on the dye concentration. No or insignificant change of fluorescence color was observed with the basic

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1980.tb00712.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Abstract –The interaction of LPS fromBacteroides fragilis, Escherichia coli, Salmonella typhimuriumand lipid A fromS. typhimuriumwith adhesion of human periodontal cells on plastic surfaces has been studied. The results showed that LPS and lipid A reduced adhesion already after 5 min at concentrations from 5 to 200 μg/ml without influencing cell viability. It could be demonstrated that LPS and lipid A interact with both the cell and the substratum surface. Lipid A fromS. typhimuriumwas more potent than any of the LPS us

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1980.tb00713.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Abstract –Colchicine in doses of 0.5, 1.0 and 1.5 mg/kg was administered to 15 rats divided in three experimental groups. Histomorphologic investigation of the maxillary incisors after 2 weeks revealed; 1) alterations in the odontoblasts mainly related to size, shape, polarity and staining properties, and 2) presence of irregular dentin separated from normal dentin by one or two incremental lines. The dentinal irregularities were dose‐dependent and consisted of twisting of the dentinal tubules, globular formations and cellular inclusions in addition to niche‐like de

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1980.tb00714.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Abstract –A total of 91 schoolchildren, 13 years of age, were distributed into three groups. Three test dentifrices were used containing 0.1% NaF, 0.1% NaF and 2% chlorhexidine, and 2% chlorhexidine, respectively. The caries increment and gingival conditions over a period of 2 years were recorded. The caries data of the groups were compared and related to two reference groups in order to estimate a possible influence upon the study results by a change in caries incidence general to the area and age groups in question. There was less caries in the group using the dentifrice containing fluoride and chlorhexidine than in the two other test groups. The differences in caries increment between the groups were not statistically significant. The gingival health seemed to improve in all groups, but there were no statistically significant differences between the groups. The caries data from the reference groups indicated that the general trend towards reduced caries incidence was different from that of the study grou

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1980.tb00715.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Abstract –Both chlorhexidine and iodine showed greater antimicrobial effect onin vitrogrownS. mutansplaque than on plaque composed ofS. sanguis. One treatment with iodine for 8 min inhibited the acid production ofS. mutansplaque whereasS. sanguisplaque required 20 min to be similarly affected. In contrast one treatment with chlorhexidine for up to 20 min did not completely inhibit the acid production of plaque of either microorganism. Repeated short term exposures increased the bactericidal effect of chlorhexidine but not that of iodine. The difference in antimicrobial effect between chlorhexidine and that of iodine onS. mutansandS. sanguisshould be investigated in persons heavily infected byS. mutan

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1980.tb00716.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Abstract –The present study was carried out to compare the effect of chlorhexidine, iodine, alcohol and hydrogen peroxide on the acidogenicity of dental plaquein vivo. Plaque pH changes after application of sucrose were measured before and at various time intervals after the topical application of the agents. The MIC values of the different agents were assessed against plaque bacteriain vitro. The antimicrobial activity of chlorhexidine and iodine were similar whereas alcohol and hydrogen peroxide were less effective in the concentrations employed. The results showed that chlorhexidine 2%, iodine 2%, and alcohol 70% inhibited pH drops for a 24‐h period after treatment whereas 3% hydrogen peroxide had no effect. Chlorhexidine 0.2% inhibited acid production to a greater extent than did alcohol 50% and iodine 0.2%. It is suggested that retention of chlorhexidine in plaque may explain the observed prolonged eff

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1980.tb00717.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Abstract –This paper reports on the presence of low numbers of Streptococcus mutans among the oral streptococci present in human dental plaque in a Sri Lanka (Ceylon) population, where the caries activity is low and a low sucrose intake is combined with the presence of heavy plaque deposits. Plaque samples of unknown age were collected from 10 individuals in a tea estate, and another 10 samples were collected from dental students 19 days following interruption of oral hygiene. Of 670 such strains of oral streptococci studied, none showed typical “frosted glass” colony morphology on Mitis Salivarius agar. However, when subjected to physiological tests 14 of them were classified as S. m

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1980.tb00718.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Abstract –Five antiseptics commonly used in endodontic treatment were evaluated with regard to cytotoxicity and initial tissue irritating effect. The cytotoxicity was evaluated in a cell culture system using HeLa cells and the initial tissue irritating effect was assessed by application of the antiseptics onto an intact nonepithelialized tissue surface. The cell response was assessed by registering changes in the DNA synthesis of the cells and the tissue response was assessed by registering changes in the oxidoreductase enzyme activity of the tissue. To evaluate the ability of the cells and the tissue to overcome an induced damage, one part of the study included a recovery period before the condition of the cells and the tissue was assessed. The most severe cell and tissue reactions were caused by 5% Chloramine‐T® whereas no differences in toxicity or tissue irritating effect were found between 0.04% Jodopax®, 0.1% Bioscpt®, 0.1 % Hibitanc®, or 0.5% sodium hypochlorite. The HeLa cells showed the best recovery after having been influenced by Jodopax, Chloramine‐T or sodium hypochlorite solutions, whereas the best tissue recovery was observed in the experiments with Biosept and

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1980.tb00719.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Abstract –The aim of the present investigation was to study whether an intense period of individual oral hygiene education would result in proper dental health behavior and to compare the effects of such education on 30 individuals undergoing subsequent orthodontic treatment and 30 controls without such treatment. The investigation consisted of two experimental periods: one period of oral hygiene education during which information on proper plaque control was given fortnightly for 6 weeks and one follow‐up period of 30 months corresponding to the orthodontic treatment phase. The results suggest that it is possible to achieve and maintain a high standard of dental health behavior following an intense period of individual oral hygiene education. A certain deterioration of the gingival status was observed after 3 months in the orthodontically treated children. This was interpreted as being due to the influence of subgingivally located orthodontic bands. After 30 months a high level of oral hygiene and gingival status as well as a low caries activity were still apparent with only minor and insignificant differences between the children subject to orthodontic treatment and the contr

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1980.tb00720.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Abstract –In terms of the mean voltage during maximal bite in the intercuspal position we compared the strength of the temporal and masseter muscles of 39 patients with functional disorders of the chewing apparatus and 45 controls. Maximal electrical activity was significantly stronger in the controls than in the patients. Differences between the two samples with respect to sex, age, number of opposing teeth in contact and the presence of pain and tenderness tended to favor stronger activity in the controls. However, the different levels of electrical activity, especially in the case of the masscter muscles, could only be accounted for on the basis of a difference in maximal strength. we suggest that the weaker elevator muscles of the patients was a predisposing factor making these muscles less fit to endure hyperactivity induced psychologically or as a reflex response to occlusal interferences and functional disorders of the temporomandibular joints or other elements of the oral neuromuscular system. The sample of controls had much stranger elevators, less susceptible to such hyperactivit

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1980.tb00721.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY