摘要:

Abstract—Tetracycline in low dose is often used as a marker in hard tissue research. A low dose effect on enamel formation has never been proven despite well known toxic reactions in enamel after higher doses. The purpose of the investigation was to evaluate enamel formation in maxillary incisors of rats given a single low dose of a tetracycline with low toxicity, commonly used in research. Eight young rats received an intraperiotonal injection of 2 mg oxytetracycline per 100 g. The rats were terminated after periods between 1 h until 5 days. Undemineralized ground sections were prepared and studied under fluorescence microscopy. Microradiograms were taken to study the degree of mineralization. A diffuse uptake was seen within enamel in areas corresponding to late secretory stage and incisally in maturing enamel with a low mineralization degree. Tendencies of enamel aberrations were seen in all rats. These appeared as splittings within the formed enamel. In conclusion, low toxicity tetracycline disturbs normal amelogenesis, even if administered in low doses. It should therefore be avoided in hard tissue research where enamel formation is studie

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1989.tb01449.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract—A total of 20 individuals with X‐chromosome aberrations, 14 45,X/46,XX‐women and six 46,Xi(Xq)‐women, were examined for occlusal anomalies. The controls were first‐degree woman relatives and population women. The results showed that the most common type of malocclusion in both study groups was lateral cross bite. Also distal molar occlusion, increased maxillary overjet and in 45,X/46,XX‐women open bite was found. 45,X/46,XX‐women's occlusion seems to be more affected than that of 46,Xi(Xq)‐women. Compared to 45,X‐women, the present study groups show milder expression of malocclusion. One might speculate that enamel genes of the X‐chromosome are involved in o

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1989.tb01450.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract—The aim of this investigation was to study the effect of starch in various cereal products on pH of human dental plaque in vivo as compared to availability to the alpha‐aniylase of starch in vitro. Three separate experimental series were performed including: 1) rye and wheat products, 2) wheat products processed under both mild and severe conditions, and 3) wheat products with and without added sucrose. The pH drop in dental plaque was studied after a mouthrinse in groups of 10 subjects. Solutions of glucose or sucrose were used as references. No differences were found between boiled rye and boiled wheat, nor between rye bread and wheat bread. Severely popped wheat resulted in the greatest pH drop, followed, in order, by drum‐dried and extrusion‐cooked products. Mildly steam‐flaked and mildly dry‐autoclaved products induced comparable small pH falls. Sucrose‐sweetened wheat products resulted in lower plaque pH values compared to unsweetened products. This effect was most pronounced with a mildly processed sample. In all three series, the glucose and sucrose reference solutions showed the greatest pH drop. In conclusion, all processing methods increased the fermentability of starch in human dental plaque in vivo. Thus, the more severe the processing conditions the more prominent the pH falls. The pH drop in plaque in vivo correlated (r = 0.96 in Series 1 and r = 0.92 in Series 2) with the rate of starch hydrolysis with alpha‐a

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1989.tb01451.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract—Sucrose consumption data of the sucrose group (n =33) of a 2‐yr longitudinal study was plotted against salivary sucrase activity values obtained during this 2‐yr period. The correlation coefficients varied between 0.194 and 0.551. The subjects were divided into high (≥ 10 μmol × min−1× (10−3) and low (<10) sucrase activity subgroups. There were significant differences in the sucrose consumption and in intake frequency between these two subgroups. These findings give further support for the possibility of using sucrase activity for the estimation of the level of individual sug

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1989.tb01452.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract—A new and simplified method to estimate the salivary buffer capacity was tested. The method, Dentobuff Strip, consists of a pH indicator paper that has been impregnated with acid. A small volume of saliva is added to the strip and after 5 min the color of the strip is compared with a chart. The colors have been chosen to indicate low, medium, or good buffer capacity. The buffer capacity of stimulated saliva samples from 62 subjects was measured with the new method and compared with two commonly used clinical methods, Dentobuff, and an electrometric method. The three methods correlated well, and patients with a low salivary buffer capacity (final pH≤4), according to the electrometric method, were readily identified with the new Dentobuff Strip met

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1989.tb01453.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract—A motion sickness plaster releasing a powerful antisialogogic agent, scopolamine, was tested in a double blind clinical trial for its effect on salivary parameters in 14 healthy young men. The agent caused a decline in salivary flow rates, which was most pronounced during unstimulated conditions. Salivary pH and buffer capacity were also reduced. Salivary levels ofStreptococcus mutansand lactobacilli showed a tendency to increase during 2 days on the antisialogogic agent, but the effect onS. mutanslevels was not statistically significan

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1989.tb01454.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract—The molecular forms of fibronectin (FN) in gingival crevicular fluid of five subjects with at least two sites exhibiting clinical signs of inflammation and pockets of at least 4 mm (test group) and five subjects with clinically healthy periodontium (control group) were investigated. Samples were collected with standard filter paper strips. In the test group samples from both diseased and healthy sites were collected. After collection the test group received one episode of periodontal treatment (scaling and root planing). The sampling and clinical recordings were repeated for the diseased sites after about 2 wk. The crevicular fluid FN was analyzed using sodium dodecyl sulphate gel electrophoresis followed by western blotting with polyclonal antibodies against FN. Both intact FN and FN fragments were found in all samples. A larger proportion of FN was in degraded form in the diseased sites than in the healthy or the treated sites. FN was also degraded into smaller peptide fragments in the diseased than in the treated sites. These results suggest that crevicular fluid FN is partially degraded both in periodontal health and disease and that the degree of degradation of FN increases with periodontal inflammation and decreases with periodontal treatmen

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1989.tb01455.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract—The purpose of this investigation was to describe smoking and alcohol habits of an adult Danish population and to study whether these habits are influenced by living conditions. Moreover, the purpose was to test the hypothesis of unidimensionality of health behavior. The study comprised 749 persons in the age group 25–44 yr (82% of original sample) and data on smoking, alcohol consumption, diet, and dental health behavior were collected by interviews. Fifty‐one percent of the interviewed persons were current smokers, 58% among men and 44% among women. One‐fifth of the males and about one‐tenth of the females were classified as heavy smokers consuming more than 15 cigarettes per day. Fifty‐eight percent reported to have alcoholic drinks weekly, 71% of men and 47% of women. All in all, 65% of the study group had a weekly consumption of lager beer, 6% of strong beer, 52% of red or white wine, 12% of dessert wine, and 27% of spirits. Alcohol consumption as well as smoking was more frequent among workers than officials. Multivariate regression analyses showed that smoking and alcohol habits varied according to sex, urbanization, education, shift work, and number of children in family. Correlations between alcohol habits, smoking, and perceived dental health were observed. Furthermore, smoking and dental health behavior were negatively associated. In factor analysis of variables on diet, smoking, alcohol, and dental health behavior, two factors were isolated: 1) alcohol consumption, and 2) active dental care. Only a small proportion of the total variance was explained and, thus, the hypothesis of unidimensionality of health behavior was not confirmed. Because of the multidimensionality different strategies and methods in health education may be needed to modify or change the various types of negative heal

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1989.tb01456.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract—To evaluate the results of early interceptive grinding and also the possibility of selfcorrection of unilateral cross‐bite, 76 4‐yr‐old children with this malocclusion were divided into one treated and one untreated group. In the treatment group 50% of the children exhibited a normal transverse occlusion evaluated in the mixed dentition, at the age of 9. In the untreated group only 17% showed a spontaneous correction of the cross‐bite. Among the studied dental variables the “max./mand. arch width difference” especially in the canine region was found to be a valuable predictor indicating whether cross‐bite can be successfully treated in preschoolchildren by selective grinding. The results of this study support early treatment of unilateral cross‐bite and gives the criteria whereby successful treatment by selective grindin

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1989.tb01457.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Abstract—The inter‐ and intraexaminer reproducibility in the interpretation of the registrations of the photocclusion technique as well as the number of occlusal contacts and their intensity in natural normal dentition in centric occlusion were studied in 20 adults. No significant differences were found regarding the inter‐ and intraexaminer interpretations for both number and intensity of occlusal contacts. A mean number of 23.8 contacts per individual, an almost symmetric and balanced distribution of the contacts between left and right sides of the dentition, and an absence of any significant differences between female and male subjects characterized the normal natural dent

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1989.tb01458.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY