摘要:

Abstract –A 6‐yr‐old Danish girl born and reared in a high fluoride area in Kenya was examined for a period of 11/2 yr during which a permanent maxillary central incisor erupted. Present primary and permanent teeth showed obvious dental fluorosis with isolated pits on primary molars. At the time of eruption the crown of the permanent central incisor had its normal anatomical shape. Isolated and confluent pits began to develop about the time of complete eruption. The observations thus confirm previous theories suggesting that pits in fluorosed enamel are secondarily produced defects of traumatic

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00810.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –The dissolution of two analytical calcium fluoride preparations was studied in aqueous solution. Dissolved calcium fluoride was determined from analysis Ca and F in solution. Original samples of the two preparations and the residue after partial dissolution were studied by X‐ray diffractometry in comparison with natural fluorite. The dissolution of calcium fluoride was found to be extremely slow. After a period of 1–15 weeks, depending on the experimental conditions, a state was reached where apparently no further dissolution occurred, although the solution was far from saturation. The dissolution rate was obviously closely related to the crystal size. On partial dissolution the mean crystal size increased, probably due to the disappearance of the finest fractions. Placing the salt in a dialysis bag before immersion in the water lowered the dissolution rate and increased the undissolved fraction considerably. The results seem to support the assertion that calcium fluoride accumulated in early carious lesions after topical applications of fluoride may persist for considerable periods of

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00811.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –The position of carious lesions in fissures of 50 maxillary premolars was studied in serial ground sections in polarized light using air and various aqueous media for imbibition. The particular section in which the greatest pore volume was demonstrated, was selected for morphometric measurements of the fissure, i.e. depth, width, and angle. The localization of the carious lesion was registered in relation to four areas around the fissures, i.e. above the entrance, the top and bottom part of the wall, and below the base of the fissure. Most frequently the carious lesion was localized in the lower part of fissures (61%). Multiple foci both in the upper and lower part were found in 36% of the fissures. Only 13% had carious lesions positioned above the entrance. No relationship was found between fissure morphology and site of the carious lesions. However, this study has confirmed that fissured areas are highly susceptible to caries in premolar

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00812.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –Xylitol has previously been shown to inhibit acid production in vitro when glucose is used as energy source, and the present studies were carried out to investigate whether this effect was valid in vivo. A solution containing both xylitol and glucose was applied on sucrose—induced 4‐day‐old plaque in vivo. The xylitol added to the glucose solution inhibited the acid production in the plaque, measured as a drop in pH, compared to using glucose alone. A further reduction in acidogenicity was obtained when xylitol was used as a rinse for 1 hr continuously prior to the glucose ch

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00813.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –The present study included rinses with aqueous solutions of lanthanum prior to and after traditional chlorhexidine mouthrinses. Lanthanum has an extremely high affinity for phosphate, and the experiments were designed to examine the role of this anion as a receptor site for chlorhexidine in the oral cavity. The result indicate that from 1/3 to 1/2 of the chlorhexidine retained in the oral cavity may be bound to phosphate group

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00814.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –The objectives were to determine the degree of Actinomyces agglutinating activity in human saliva and to begin characterizing the agglutination mechanism. Agglutination titres of whole saliva collected from adults and 6‐yr‐old children were compared. Titres for A. naeslundii were always higher than for A. viscosus. The mean A. naeslundii titre for the adults’ and children's samples were equivalent. The children had a slightly lower mean titre than the adults for A. viscosus. No correlation was found between IgA concentration and agglutination titre. Agglutinating activity was partially impaired by incubation with anti‐IgA serum. Activity in submandibular/sublingual saliva was resistant to heat at 56°C but sensitive to boiling. Boiling the bacteria had no effect. In sugar inhibition tests, only galactosides (β‐Gal) and glucosamine (for A. viscosus) affected Actinomyces agglutination but impairment was only temporary. Agglutinating activity was diminished by incubating saliva with hydroxyapatite. Thus, Actinomyces agglutinins 1) are probably distinct from IgA but may complex with it; 2) may include both β‐Gal and higher affinity sites; and 3) may contribute to s

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00815.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –The aim of this work was to study the bacteriolytic ability of human salivary lysozyme (HSL) on Streptococcus mutans BHT. The cells were grown in a synthetic medium containing3H‐thymidine to monitor DNA release after incubation with either HSL, purified by ion exchange chromatography, or hen egg white lysozyme (HEWL). The experiments demonstrated that HSL as well as HEWL could liberate DNA from cells. The lysis was dependent on enzyme concentration as well as incubation‐time. Approximately 80% of the3H‐thymidine was released at final concentrattons of 4.5μg/mland incubation‐times exceeding 16hr. Additional treatment of the suspensions with DNase increased the levels of released radioisotopes. The lytic ability of HSL and HEWL was similar at low concentrations. HSL inactivated with goat antiserum to human lysozyme decreased the liberation of DNA by about 70%. This study suggests that HSL can lyse S. mutans BHT without presence of inor

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00816.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –IRM has been shown to be superior to conventional ZnOE cements. This study is a biotechnical investigation of IRM's effect on the dental pulp with respect to its sealing capacity. Enamel‐dentin test bodies with IRM fillings were used in the in vitro part, where insufficiencies in sealing were detected with compressed air. The in vivo part included 44 buccal cavities in intact premolars. In teeth in which the material effect of IRM was tested, the IRM fillings were sealed off from the saliva by acid etch and composite resin. The observation intervals were 1, 7 and 28 days. Histologic changes such as capillary dilatations and presence of inflammatory cells in the pulp adjacent to the dentinal tubules involved in the cavity preparation were registered. The in vitro test showed no leakage in five cases out of six. After extreme temperature cycling, the leakage was comparable with that of zinc‐containing amalgam of traditional alloy. The pulpal changes were mild and mainly ascribed to the material effect of IRM, since no evidence was found of leakage of biologic impor

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00817.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –Quantitative cultural studies of yeasts and bacteria were made from 1‐week‐old denture plaque accumulated on pieces of self‐adhesive tape stuck on the fitting surface of the maxillary denture in four well‐defined locations. A tape piece was also stuck on the buccal denture flange. The cultural examinations were made in 15 patients with denture‐induced stomatitis which affected most of the denture‐bearing mucosa. There was no significant difference of the bacterial counts from the different sampling areas although the variations between patients was significant. The yeast counts from the test area located on the buccal denture flange were significantly lower than those originating from the fitting denture surface. On the other hand, there was no significant variation of the yeast counts when comparing the test areas of the fitting denture surface. In 12/15 of the patients yeast counts of 103/cm2were obtained from the fitting denture surface. The results indicate that the environmental conditions beneath a denture base predispose for yeast colonization and are different from those present on the

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00818.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –The paper presents epidemiologic data of malignant oral tumors in Sweden 1958–77 including the total number of cases, the number and relative frequency of cases in different sublocations of the oral region and the mean annual age standardized incidence rate, all ages, per one million population, by site and sex. An analysis of different histopathologic types of oral tumors is also presented. A comparison is made between the two 10‐yr periods 1958–67 and 1968–77. Errors involved in epidemiologic studies are

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00819.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY