PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “Decalcification, Pathologic”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 73 records · Page 4Linked to original sources
PubMed1970

Dental enamel: detection of surface changes by ultrasound.

Evidence indicates that the tooth surface differs in structure from the enamel immediately beneath it, and particularly that the enamel rod type structure is minimal in the true natural surface. Furthermore, the rod ends appear to disappear with age after the eruption of the tooth. The thickness of the surface layer may be as much as 25 micrometers. Studies of caries incidence show a peak in the attack curve 2 to 4 years after eruption and a decline thereafter for all teeth. This information indicates that the mechanical structure of the tooth surface should be carefully studied. A highly useful means appears to be ultrasound since the specific acoustic impedance of highly mineralized tissue like enamel is strongly dependent on fraction volume mineralization and since non-destructive test techniques can be based on ultrasonics. An experimental demonstration of ultrasonic detection in vitro of tooth surface demineralization is given.

Collagen↗
PubMed1979

Colonization of the cementum surface of teeth by oral Gram-negative bacteria.

By using in vitro assays, a group of related, filamentous gram-negative bacteria isolated from subgingival plaque deposits of patients with periodontal disease were found to colonize intact teeth. Tentatively identified as members of the genus Cytophaga, these isolates exhibited a preference for colonizing the cementum surface of the root. Examination of intact teeth after several weeks of colonization revealed that the root substructure had been extensively demineralized.

Culture Media↗
PubMed1972

Quantitative observations on mineralized and non-mineralized bone in the iliac crest.

The amounts of mineralized bone and osteoid in thin undecalcified sections of iliac crest have been measured in 68 control subjects at necropsy using a point-counting method. The effect of varying the site selected for quantitative study on the value obtained for total bone mass has been investigated in decalcified sections of iliac crest. The total bone mass shows individual variation within a fairly constant range with a mean of 22.7 +/- 0.5% up to the age of 50 years and then progressively falls to a mean of 15.5 +/- 1.1% for individuals aged > 50 years. Some of the lowest values in the range 5.5 to 16.4 (mean 8.9 +/- 1.9%) were observed in elderly women in the seventh to ninth decades. It is concluded that so-called senile osteoporosis is usually a manifestation of a normal aging process. In controls osteoid accounts for only about 0.1% of the area measured and for a maximum of 1.8% of bone with a mean mineralization of 99.5%. Osteoid is patchily distributed and the maximum number of birefringent lamellae in any seam is four. The results of quantitative histology carried out in different parts of the iliac crest indicate that there are variations with the distance of the site from the anterior superior spine and its depth below the crest surface. The importance of this in relation to the site and size of iliac crest biopsies used for quantitative histology is discussed. There is a significant correlation between the values for total bone mass when estimated by the point-counting technique in undecalcified sections and by a volumetric method using blocks of bone.

Adolescent↗
PubMed1984

X ray anomalies occurring in workers exposed to vibration caused by light tools.

A high frequency of radiological anomalies (vacuoles, cysts, enostoses) was found in workers exposed to vibration caused by light tools (screw drivers, nutrunners) compared with a non-exposed group. The lesions were mostly localised in the spongy carpal bones (os capitatum, os lunatum, os scaphoideum). There was no significant difference between the sexes, nor between the "active" or "passive" hand, both hands being simultaneously exposed. These findings support the need to implement preventive measures.

Adolescent↗
PubMedDate not supplied

Enamel demineralization by snack foods.

The amount of enamel destroyed by salivary fermentation of snack foods and confections was not dependent on their sugar content; starch, flavoring agents, and other components also played a part. Most enamel destruction was produced by fruit-flavored candies in which the inherent acid or high sugar concentration or both inhibited bacterial fermentation.

Acids↗