Neonatal lines in the enamel of primary teeth - a morphological and scanning electron microscopic investigation

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Neonatal lines in the enamel of primary teeth - a morphological and scanning electron microscopic investigation

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Publication Article, peer reviewed scientific
Title Neonatal lines in the enamel of primary teeth - a morphological and scanning electron microscopic investigation
Author(s) Sabel, Nina ; Johansson, Carina ; Kühnisch, Jan ; Robertson, Agneta ; Steiniger, Frank ; Norén, Jörgen G ; Klingberg, Gunilla ; Nietzsche, Sandor
Date 2008
English abstract
Department of Pedodontics, Faculty of Odontology, Göteborg University, Göteborg, Sweden; Department of Pediatric Dentistry, Public Dental Service, Göteborg, Sweden. OBJECTIVE: The neonatal line (NNL) is in principle found in all primary teeth and the line represents the time of birth. Earlier findings of the appearance of the NNL in light microscope and in microradiographs have shown not only changes in the prism direction of the enamel, but that the NNL has a hypomineralized character. METHODS: The neonatal line was analyzed in un-decalcified sections of primary lower and central incisors, collected from individuals of different ages utilizing polarized light microscopy, microradiography, scanning electron microscopy (SEM) and X-ray analysis (XRMA). RESULTS: In polarized light the NNL appeared to have a more porous structure than the enamel in general. The appearance of the NNL as a dark line in microradiographs is interpreted as the NNL being less mineralized than neighbouring enamel. Analysis with ImageJ visualized the reduction of the amount of grey value, indicating that the NNL is less mineralized. Analysis of the NNL in SEM showed a reduction of the diameter of enamel prisms, the more narrow diameters continued through the postnatal enamel. A change of the growth direction of the prisms was also observed at the NNL. In a three-dimensional image the NNL appeared as a grove, however, in non-etched enamel no grove was seen. The elemental analyses with XRMA showed no marked changes in the content of C, Ca, P, N, O or S in the area around the NNL. CONCLUSIONS: The NNL is an optical phenomenon due to alterations in height, and degree of mineralization of the enamel prisms. PMID: 18589400 [PubMed - in process]
DOI http://dx.doi.org/10.1016/j.archoralbio.2008.05.003 (link to publisher's fulltext)
Host/Issue Archives of Oral Biology;10
Volume 53
ISSN 0003-9969
Pages 954-63
Language eng (iso)
Subject(s) Medicine
Research Subject Categories::ODONTOLOGY
Handle http://hdl.handle.net/2043/6530 (link to this page)

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