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PubMed1978

[Comparative histological studies of mouth mucosa, gingiva and desmodont in normal guinea pigs and guinea pigs fed a vitamin C deficient diet].

The changes occurring in the oral mucosa, gingivae and periodontium of guinea pigs fed a vitamin C-deficient diet were determined by means of histological comparison with animals on a normal diet. The following results were obtained from the scorbutic guinea pigs: --detachment of the horny layer from the underlying epithelium, --bullous cells in the spinose and the granular layer, --formation of periodontal pockets, --reduction in number and disorientation of collagenous fibres of the periodontium associated with loosening of the molars.

Animals↗
PubMed1978

[Individual differences in the marginal periodontium of crowned and non-crowned topographically identical teeth].

A comparison was made on 191 crowned teeth in 125 patients altogether with removable partial replacements after average wear of 4.8 years with the corresponding number of contralateral uncrowned teeth. It could be shown that there was no significant difference between crowned and uncrowned teeth in respect of periodontal changes (loosening and deepening of pockets of pockets, periodontal diagnosis). Findings in crowned teeth had a frequent tendency to worsen.

Crowns↗
PubMed1978

[Periodontal disease index].

Periodontal disease indices are a must in epidemiologic studies, analytical epidemiology making special demands. The indices hitherto commonly used do not meet all demands; consequently, they can be applied only in certain studies, especially in the sense of descriptive epidemiology. For 15 years, the periodontal disease index according to Kötzschke has proved to be useful for large-scale correlation calculations, being well suited for making evident the effects of the most different factors. At the beginning of any experiment and investigation, exact considerations must be given to the aim and special objectives of an index.

Gingival Pocket↗
PubMed1979

[Retrograde movement of upper incisors].

Labial stress of 1 to 8 n(102-815 Pond) was exerted on free-standing upper incisors, both healthy teeth and teeth damaged by progressive marginal periodontitis, until all creeping movement subsided and constant guidance was achieved. The teeth were then freed, and the resetting movements were measured without inertia and free of effect. The dampening characteristics of healthy and diseased teeth differed qualitatively in the first few milliseconds. Construction of a diagnostic device of determination of periodontal disease suitable for the general practice therefore ought to be possible.

Biomechanical Phenomena↗