摘要:

Mononuclear cell populations were studied in gingival biopsy specimens from adolescents (n= 10) with at least one periodontal pocket with an increased probing depth (>5 mm). The marginal bone loss was measured on radiographs, subgingival plaque samples were collected from the lesions, and the microbial flora was identified. Specimens from gingivitis lesions (n= 5) were used as controls. The mononuclear cell populations in the specimens were detected by using monoclonal antibodies defining functional T-lymphocyte subpopulations, B lymphocytes, and monocytes. All gingival specimens from patients with increased probing depth showed large lymphocyte infiltrates, most of which were CD 3-antigen-positive cells (T lymphocytes). Few (2%) infiltrating T cells expressed receptors for interleukin-2. B cells were detected in most specimens from the periodontitis group and varied from less than 1% to 21%. This study indicates that lesions in adolescents with early signs of periodontitis are characterized predominantly by T-cell lesions with relatively few cell aggregates of B cells present.

ISSN:0001-6357    

DOI:10.3109/00016359009005870

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor

摘要:

Marginal adaptation and bacterial penetration were studied in 32 primary molars filled with composite resin in shallow class II cavities. The restorations had served in the mouth for 3 years (mean, 3 years and 4 months; range, 8 months to 6 years and 4 months). Ground sections of the retrieved teeth were evaluated with polarized light microscopy and demineralized sections with light microscopy. Clinically excellent restorations, free from bacteria, were found in 25%. Gaps were recorded in 42%, under- or over-contouring and porosities in 95%, caries in the cervical area in 58%. Bacteria were observed subjacent to the fillings in 75% and in the dentin tubules in 61%. Pupal necrosis was found in 7 of 16 teeth. Marginal discoloration, visible crevice, or color mismatch was associated with marginal defects, bacterial leakage, and pulpal reactions.

ISSN:0001-6357    

DOI:10.3109/00016359009005871

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor

摘要:

The purpose of this study was to assess the antimicrobial effect of TiF4as compared with equimolar solutions of NaF, APF, and SnF2and to evaluate the effect, if any, on bacterial growth on topically treated tooth surfaces. In an in vitro study, paper discs impregnated with 20μl of equimolar solutions of SnF2, NaF, APF, and TiF4were placed on blood agar plates seeded withStreptococcus mutansandBacteroides gingivalis. Sterile saline was used as control. Similar growth inhibition zones were found for all fluorides. In the second part of the study six volunteers carried intraoral appliances containing enamel and root surface specimens treated with 1% TiF4and untreated specimens for 18 h. Scanning electron microscopic examination of the experimental tooth surfaces showed great variation in bacterial growth between subjects, but no systematic difference between fluoride-treated and untreated specimens. Bacteria from test and control specimens were grown under aerobic and anaerobic conditions on blood agar and on mitis salivarius agar. Colony-forming unit counts showed great interindividual variations, but no differences could be observed between treated and untreated enamel or root surfaces. Thus, the hypothesis that the presence of a Ti-rich coating may influence bacterial colonization on TiF4-treated tooth surfaces could not be substantiated.

ISSN:0001-6357    

DOI:10.3109/00016359009005872

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor

摘要:

The aim of this study was to estimate dental treatment need in groups of Chilean and Polish refugees in Sweden. Of the Nordic countries, Sweden accepts the greatest number of refugees. An average of 5000 refugees arrived annually in 1981–85, increasing to 15,000 during 1986–87. Refugees and their families now comprise 93% of non-Nordic immigration. In 1981–83 a sample of 193 Chilean and 92 Polish refugees in the county of Stockholm was selected for this study. Dental treatment needs were calculated in accordance with CPITN and the working study of Swedish dentistry, which formed the basis for the Swedish scale of dental fees for the National Dental Insurance Scheme. The estimated mean treatment time (±SD) in the Chilean sample was 6.9±2.3 h and in the Polish group 8.4±3.0; in comparison with estimated treatment needs in a Swedish material, both would be classified as extreme risk groups. There was no correlation between the number of months in Sweden and the estimated treatment needs. The results indicate a cumulative, unmet need for dental care in these groups. Barriers to ensuring adequate health care for immigrants persist; special outreach programmes, conducted by dental health personnel, may be an effective means of introducing immigrants to the Swedish dental care system.

ISSN:0001-6357    

DOI:10.3109/00016359009005873

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor

摘要:

Samples of stimulated whole saliva were collected from 176 dental students, and their teeth were examined both clinically and radiographically. Salivary flow; buffering capacity; numbers of lactobacilli, yeasts, andStreptococcus mutans; and DMFS and DS values were correlated to sucrase activity. The high flow-rate group had a lower (p= 0.0201*) sucrase activity than the low flow-rate group. The proportion of high (≥10μmol/min×mg×10−3) sucrase activities among the highest density category of lactobacilli was 67%, whereas the corresponding proportion in the whole material was only 28%. Men had significantly (p= 0.0169*) higher sucrase activities than women. The other variables measured did not seem to have any significant effect on the sucrase activity values. In addition to sucrose consumption, other factors like the rate of salivary flow and the density of lactobacilli seem to influence the level of salivary sucrase activity.

ISSN:0001-6357    

DOI:10.3109/00016359009005874

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor

摘要:

In 10 healthy persons all amalgam fillings were replaced with gold inlays. Blood and urinary levels were measured on 10 occasions during a 4-month period before and a 12-month period after amalgam removal. These variables were also measured three times in 10 healthy controls. A strong statistically significant relation was found between plasma mercury values and both the total number of amalgam surfaces (r= 0.71,p= 0.0006) and the total surface area of the fillings (r= 0.73,p= 0.0004). In the immediate postremoval phase plasma mercury rose three- to four-fold, whereas the urinary and erythrocyte mercury rose about 50%. These peak values declined to the preremoval level at about 1 month. Twelve months after the removal the plasma and urinary mercury levels were significantly reduced to 50% and 25%, respectively, of the initial values for the experimental group. Apart from the significantly lower plasma selenium values 5 and 10 days after removal no significant differences were found with regard to plasma selenium or erythrocyte glutathione peroxidase either within or between the experimental and the control groups. A large number of supplementary biochemical analyses did not show any influence on organ functions or any differences between the groups before or after the amalgam removal. Amalgam fillings considerably contributed to the plasma and urinary mercury levels.

ISSN:0001-6357    

DOI:10.3109/00016359009005875

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor

摘要:

The cellular dynamic pattern of pulpal healing 4, 10, 30, and 60 days after replantation of 47 apicoectomized cat incisors was studied after pulse labeling with3H-thymidine and35S-sulfate, autoradiography, and routine histology. In the control teeth the labeling index was less than 0.05%. The apical pulpal cells were capable of ground substance formation and cell proliferation already 4 days after replantation, with a labeling index of 7%, which increased up to 43% within 10 days. A gradual postoperative restitution and reorganization within the pulpal cellular compartment was seen. The maximum cell density, reached after 30 days, was reduced to on average 60% compared with the controls. The tissue reorganization was near completion within all pulpal zones after 60 days, and the labeling index was reduced to 2.5%. In some instances internal resorption in cervical pulpal areas negatively influenced the favorable healing. The present study shows that the pulpal healing in replanted teeth follows a consistent basic pattern in cellular dynamics and in histologie changes. The replanted tooth thus seems to be a suitable model for studies of healing and repair in connective tissues.

ISSN:0001-6357    

DOI:10.3109/00016359009005876

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor