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XRMA and ToF-SIMS Analysis of Normal and Hypomineralized Enamel

Published online by Cambridge University Press:  12 February 2015

Lisa Melin ,
Jesper Lundgren ,
Per Malmberg ,
Jörgen G. Norén ,
Fabian Taube  and
David H. Cornell
Lisa Melin
Affiliation:
Department of Pediatric Dentistry, Institute of Odontology at the Sahlgrenska Academy, University of Gothenburg, P.O. Box 450, SE 405 30 Gothenburg, Sweden
Jesper Lundgren
Affiliation:
Department of Psychology, University of Gothenburg, P.O. Box 500, SE 405 30 Gothenburg, Sweden
Per Malmberg
Affiliation:
Department of Chemical and Biological Engineering, Chalmers University of Technology, Kemivägen 10, 412 96 Gothenburg, Sweden
Jörgen G. Norén*
Affiliation:
Department of Pediatric Dentistry, Institute of Odontology at the Sahlgrenska Academy, University of Gothenburg, P.O. Box 450, SE 405 30 Gothenburg, Sweden
Fabian Taube
Affiliation:
Department of Occupational and Environmental Medicine, Sahlgrenska University Hospital, P.O. Box 414, SE 405 30 Gothenburg, Sweden
David H. Cornell
Affiliation:
Department of Earth Sciences, University of Gothenburg, P.O. Box 460, SE 405 30 Gothenburg, Sweden
*
*Corresponding author. [email protected]
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Abstract

Molar incisor hypomineralization (MIH) is a developmental disturbance of the enamel. This study presents analyses of hypomineralized and normal enamel in first molar teeth diagnosed with MIH, utilizing time-of-flight secondary ion mass spectrometry area analyses and X-ray microanalysis of area and spot profiles in uncoated samples between gold lines which provide electrical conductivity. Statistical analysis of mean values allows discrimination of normal from MIH enamel, which has higher Mg and lower Na and P. Inductive analysis using complete data sets for profiles from the enamel surface to the enamel–dentin junction found that Mg, Cl and position in the profile provide useful discrimination criteria. Element profiles provide a visual complement to the inductive analysis and several elements also provide insight into the development of both normal and MIH enamel. The higher Mg content and different Cl profiles of hypomineralized enamel compared with normal enamel are probably related to a relatively short period during the development of ameloblasts between birth and the 1st year of life.

Keywords

enamelMIHSEMToF-SIMSXRMA
Type
Biological Applications
Information
Microscopy and Microanalysis , Volume 21 , Issue 2 , April 2015 , pp. 407 - 421
Copyright
© Microscopy Society of America 2015 

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