Results 251 to 260 of about 118,793 (299)

Trapped Water of Dental Enamel

Nature, 1965
RECENT investigations with polarizing microscopy have indicated that some of the water of dental enamel is not easily removed by dehydrating methods. Somewhat more severe treatment of enamel is necessary to remove the last portion of water and these more drastic conditions bring about irreversible changes in enamel1.
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Growth tracks in dental enamel

Journal of Human Evolution, 1998
The present paper evaluates the enamel growth tracks as tools in the chronological mapping of dental development, with special reference to hominids. Dental enamel consists of tightly packed hydroxyapatite crystals organized by differential orientation into a pattern of prisms and interprisms. The crystal organization is probably under the influence of
Steinar Risnes
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Dental enamel defects in coeliac disease

The Lancet, 1994
A, Ballinger, C, Hughes, P, Kumar, I, Hutchinson, M, Clark   +4 more
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Dental Enamel Electrochemistry

Journal of Dental Research, 1973
The results of several experiments implicate electrochemical phenomena in the formation of dental caries. The passage of an electric current through enamel causes degradation and a carious appearance. The fluoride ion minimizes the variations in natural electric potentials and inhibits electric current.
R A, Dickerson, J M, Lenoir
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Dental Caries and Enamel Structure

Nature, 1966
A GENERALLY accepted feature of the histology of ground sections of carious lesions in human dental enamel is the so called ‘dark zone’. This zone, which lies at the border of the lesion, between the main body and the translucent zone or normal enamel, shows positive birefringence when the section is placed in quinoline and viewed by polarized light ...
H S, Crabb, K V, Mortimer
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Enamel Opacities and Dental Esthetics

Journal of Public Health Dentistry, 1995
Abstract Objectives: The purpose of this study was to determine the esthetic importance of different types of developmental enamel defect. Methods: In the first method used, individual subjects from three different populations with less than 0.1, 0.7, and 0.9 ppm fluoride in their drinking water, were asked about the appearance of their teeth and ...
R P, Ellwood, D, O'Mullane
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Strontium Incorporation into Dental Enamel

Science, 1966
Rats were raised on diets either rich or poor in strontium. Powder x-ray diffraction patterns suggest that isomorphous substitution of strontium for calcium occurs in the apatite of tooth enamel, and that strontium may form Sr 6 H 3 (PO 4 ) ⋅ 2H 2
A R, Johnson, W D, Armstrong, L, Singer
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Dental enamel regeneration

2014
Enamel formation Enamel is the outermost covering of vertebrate teeth and the hardest tissue in the vertebrate body. During tooth development, ectoderm-derived ameloblast cells create enamel by synthesizing a complex protein mixture into the extracellular space where the proteins self-assemble to form a matrix that patterns the woven hydroxyapatite ...
Xanthippi Chatzistavrou, Petros Papagerakis   +1 more
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Molecular Sieve Behaviour of Dental Enamel

Nature, 1961
NORMAL mammalian tooth enamel is highly calcified, containing 97 per cent mineral and 3 per cent organic material and water. The mineral is hydroxyapatite, Ca10(PO4)6(OH)2, and it is associated with a protein constituent of the keratin type1. From histological studies it is well known that normal enamel is made up of structural units which are ...
D F, POOLE, K V, MORTIMER, A I, DARLING, W D, OLLIS   +3 more
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Dental enamel defects in celiac disease

Journal of Oral Pathology & Medicine, 1990
The teeth of 40 adults aged 19 to 67 yr with celiac disease (CD) were examined for dental enamel defects (ED). A total of 33 of the 40 adults with CD (83%) had systematic ED in contrast to only 5 of the 112 clinical controls (4%). Unspecific enamel lesions were found in both groups, but they were more common in the control group (80% vs.
L, Aine, M, Mäki, P, Collin, O, Keyriläinen   +3 more
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