Secondary ion mass spectrometry and X-ray microanalysis of hypomineralized enamel in human permanent first molars

A common finding in Swedish children is hypomineralization in first molars of unknown cause. Little is known about the chemical composition of the disturbed enamel. The aim here was to analyse the concentration gradients for F, Cl, Na, Mg, K and Sr in hypomineralized enamel from 17 permanent molars...

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Bibliographic Details
Published in:Archives of oral biology 2001-03, Vol.46 (3), p.239-247
Main Authors: Jälevik, Birgitta, Odelius, Hans, Dietz, Wolfram, Norén, JörgenG
Format: Article
Language:English
Subjects:
abnormalities
analysis
Calcium
Calcium - analysis
Carbon
Carbon - analysis
chemistry
Child
Chlorine
Chlorine - analysis
Dental Enamel
Dental Enamel - abnormalities
Dental Enamel - chemistry
Dentistry
Electron Probe Microanalysis
Enamel
Fluorine
Fluorine - analysis
Humans
Hypomineralization
Inorganic elements
Magnesium
Magnesium - analysis
Mass
Molar
Molar - abnormalities
Molar - chemistry
Odontologi
Oxygen
Oxygen - analysis
Phosphorus
Phosphorus - analysis
Potassium
Potassium - analysis
Secondary Ion
SIMS
Sodium
Sodium - analysis
Spectrometry
Spectrometry, Mass, Secondary Ion
Strontium
Strontium - analysis
Tooth Calcification
XRMA
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Summary:A common finding in Swedish children is hypomineralization in first molars of unknown cause. Little is known about the chemical composition of the disturbed enamel. The aim here was to analyse the concentration gradients for F, Cl, Na, Mg, K and Sr in hypomineralized enamel from 17 permanent molars by means of secondary ion mass spectrometry, to complete this analysis with an examination of the main matrix elements O, P and Ca by means of X-ray microanalysis, and to compare them with normal enamel. Hypomineralized enamel had a higher content of carbon and the calcium as well as the phosphorus concentration was lower than in normal enamel. The mean Ca/P ratio in hypomineralized areas was significantly lower (1.4) than in the adjacent normal enamel (1.8). The F content was highly variable in impaired enamel and higher than in normal, but close to the surface there was most often no difference between the two. Contents of Mg and K were slightly higher in hypomineralized areas, especially towards the surface. Also Na had a somewhat higher content toward the surface in defective enamel. Cl and Sr contents had negligible or no diversity in relation to the degree of mineralization.
ISSN:0003-9969
1879-1506
DOI:10.1016/S0003-9969(00)00113-8