摘要:

A new method for the determination of Ca and P in surface enamel is described. The Ca and P content in the surface layer is much higher than expected. During remineralisation a salt with a lower molar Ca/P ratio is formed in the subsurface lesion. Remineralisation stimulates the formation of this salt different from apatite. EHDP prevents the formation of this salt in favour of the salt originally present in sound enamel.

ISSN:0008-6568    

DOI:10.1159/000260503

出版商:S. Karger AG    

年代:1981

数据来源: Karger

摘要:

The fluoride content of 147 pieces of vertebral cancellous bone, collected at autopsy from long-term residents in Basle, Switzerland, was determined. A statistical analysis of the results sustained the hypothesis of age-dependent fluoride accumulation in bone. No differences were found between sexes. 4 cases with severe chronic pyelonephritis had definitely elevated fluoride values.

ISSN:0008-6568    

DOI:10.1159/000260504

出版商:S. Karger AG    

年代:1981

数据来源: Karger

摘要:

In vitro topical application of sodium monofluorophosphate (MFP) to enamel causes very limited fluoride enrichment. Thus, only a few hundred ppm fluoride penetrated to a depth of 5 μm after a 5 min application even when the acidity was decreased from pH 7.0 to 4.4 or the concentration varied from 0.4 to 1.5 M. Greater penetration was seen at pH 3.2. More fluoride penetrated into the enamel from a neutral MFP solution than from a neutral sodium fluoride solution that contained the same amount of fluoride ion. Most of the fluoride in the enamel was already ionic after 5 min. Fluorapatite formation could not be demonstrated immediately after a 5 min application but was observed after a 24 h posttreatment incubation. Greater penetration of fluoride and enhanced formation of fluorapatite resulted when the application time was increased to 6 h. Neutral ammonium MFP was more reactive than neutral sodium MFP

ISSN:0008-6568    

DOI:10.1159/000260505

出版商:S. Karger AG    

年代:1981

数据来源: Karger

摘要:

Mixed salivary fluoride levels have been measured after 9 subjects sucked or slowly dissolved three different brands of 1 mg F–– fluoride tablets. Results indicate that for all preparations the maximum salivary F–– concentration was obtained when a tablet was sucked rather than dissolved. However, salivary F–– retention was greatly enhanced under conditions which allowed undisturbed disintegration of each formulation. The most highly flavoured tablet produced the least favourable data and it is postulated that the ideal clinical situation would be provided by a slightly flavoured tablet which would be capable of providing prolonged release of fluoride to the oral

ISSN:0008-6568    

DOI:10.1159/000260506

出版商:S. Karger AG    

年代:1981

数据来源: Karger

摘要:

DMFS examinations and fluoride biopsies of enamel were carried out on 387, 6- to 9-year-old schoolchildren, receiving fluoridated or pure citrus beverage for 36 months. A group not receiving beverage in school served as the control. A reduction of about 30% in the incremental caries rate was observed in the children receiving fluoridated beverage. No significant differences were observed between the mean F concentrations in the enamel biopsies for all groups.

ISSN:0008-6568    

DOI:10.1159/000260507

出版商:S. Karger AG    

年代:1981

数据来源: Karger

摘要:

Artificial carious lesions were produced by a gelatin/lactic acid system in deciduous bovine, permanent bovine, deciduous human and permanent human enamel over periods up to 8 days, and the progress measured by dye imbibition studies. Artificial carious lesions were produced in bovine, ovine and human permanent enamel using a diphosphonate/lactic acid system over periods up to 30 days, progress was assessed by depth measurement, and overall diffusion coefficients were calculated. The rate of lesion progress was linear with the square root of time for both systems of assessment. Lesion progress as measured by dye imbibition was in the ratio 3.7: 2.9: 1.5:1.0 for bovine deciduous: bovine permanent: human deciduous: human permanent, respectively. Bovine permanent, ovine permanent and abraded bovine permanent lesions progressed at equal rates and in the ratio 3.0: 1.0 to human permanent enamel, as measured by overall diffusion coefficients. The results provide an approximate basis for the use of bovine, ovine and human artificial carious lesion data in the quantitative discussion of the caries process.

ISSN:0008-6568    

DOI:10.1159/000260508

出版商:S. Karger AG    

年代:1981

数据来源: Karger

ISSN:0008-6568    

DOI:10.1159/000260509

出版商:S. Karger AG    

年代:1981

数据来源: Karger