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Mineral density of hypomineralised enamel

Mineral density of hypomineralised enamel
Mineral density of hypomineralised enamel
Objectives
To characterize molar–incisor hypomineralisation (MIH) defects of different severities quantitatively and qualitatively using X-ray microtomography (XMT) and to measure the range of reduction in mineral density (MD) of MIH enamel compared with the normal range.

Methods
Ten sound teeth and ten MIH teeth were scanned using a commercial XMT system. Four hydroxyapatite phantoms of different densities were used as calibration standards with each scan. A calibration equation derived from the phantoms with each tooth was used for MD calibration. MD was traced from the cementum–enamel junction (CEJ) to the cusp tip and from the dentine–enamel junction (DEJ) to the outer enamel surface.

Results
In sound teeth, MD increased from CEJ to cusp/incisal tip, while in MIH teeth MD dropped from the CEJ to the occlusal region, then increased again at the cusp tip. MD was highest midway between DEJ and outer enamel in sound teeth. In MIH, enamel showed normal thickness and MD was highest near the DEJ and then decreased towards the outer enamel. MD of MIH enamel was on average about 19% lower than sound enamel. The MIH defects seemed to follow the incremental lines of enamel formation.

Conclusions
MIH defects are hypomineralised defects of different severities that follow the natural incremental lines of enamel formation. Cuspal areas are usually only mildly affected and cervical enamel always appears to be sound.
0300-5712
50-58
Farah, R.A.
2814e937-e9b4-4894-9e78-cdc99033c603
Swain, M.V.
f988778b-1645-4be7-ac02-f969742febc4
Drummond, B.K.
eec62e89-4b86-49ff-bbad-ddd4ba0ff31a
Cook, R.B.
06f8322d-81be-4f82-9326-19e55541c78f
Atieh, M.
f195233c-20f5-482d-bcbc-8ab01260db72
Farah, R.A.
2814e937-e9b4-4894-9e78-cdc99033c603
Swain, M.V.
f988778b-1645-4be7-ac02-f969742febc4
Drummond, B.K.
eec62e89-4b86-49ff-bbad-ddd4ba0ff31a
Cook, R.B.
06f8322d-81be-4f82-9326-19e55541c78f
Atieh, M.
f195233c-20f5-482d-bcbc-8ab01260db72

Farah, R.A., Swain, M.V., Drummond, B.K., Cook, R.B. and Atieh, M. (2010) Mineral density of hypomineralised enamel. Journal of Dentistry, 38 (1), 50-58. (doi:10.1016/j.jdent.2009.09.002). (PMID:19737596)

Record type: Article

Abstract

Objectives
To characterize molar–incisor hypomineralisation (MIH) defects of different severities quantitatively and qualitatively using X-ray microtomography (XMT) and to measure the range of reduction in mineral density (MD) of MIH enamel compared with the normal range.

Methods
Ten sound teeth and ten MIH teeth were scanned using a commercial XMT system. Four hydroxyapatite phantoms of different densities were used as calibration standards with each scan. A calibration equation derived from the phantoms with each tooth was used for MD calibration. MD was traced from the cementum–enamel junction (CEJ) to the cusp tip and from the dentine–enamel junction (DEJ) to the outer enamel surface.

Results
In sound teeth, MD increased from CEJ to cusp/incisal tip, while in MIH teeth MD dropped from the CEJ to the occlusal region, then increased again at the cusp tip. MD was highest midway between DEJ and outer enamel in sound teeth. In MIH, enamel showed normal thickness and MD was highest near the DEJ and then decreased towards the outer enamel. MD of MIH enamel was on average about 19% lower than sound enamel. The MIH defects seemed to follow the incremental lines of enamel formation.

Conclusions
MIH defects are hypomineralised defects of different severities that follow the natural incremental lines of enamel formation. Cuspal areas are usually only mildly affected and cervical enamel always appears to be sound.

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More information

Published date: January 2010
Organisations: nCATS Group

Identifiers

Local EPrints ID: 158607
URI: http://eprints.soton.ac.uk/id/eprint/158607
ISSN: 0300-5712
PURE UUID: e6651d2d-e347-4139-9ffc-210681ab243e
ORCID for R.B. Cook: ORCID iD orcid.org/0000-0002-2468-5820

Catalogue record

Date deposited: 26 Mar 2013 09:37
Last modified: 14 Mar 2024 02:55

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Contributors

Author: R.A. Farah
Author: M.V. Swain
Author: B.K. Drummond
Author: R.B. Cook ORCID iD
Author: M. Atieh

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