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Type: Journal article
Title: Effect of down syndrome on the dimensions of dental crowns and tissues
Author: Bell, E.
Townsend, G.
Wilson, D.
Kieser, J.
Hughes, T.
Citation: American Journal of Human Biology, 2001; 13(5):690-698
Publisher: Wiley-Liss
Issue Date: 2001
ISSN: 1042-0533
Statement of
Emma Bell, Grant Townsend, David Wilson, Jules Kieser, and Toby Hughes
Abstract: Abnormal growth in Down syndrome (DS) is reflected by variable reduction in size and simplification in form of many physical traits. This study aimed to compare the thickness of enamel and dentine in deciduous and permanent mandibular incisor teeth between DS and non-DS individuals and to clarify how these tissues contribute to altered tooth size in DS. Sample groups comprised 61 mandibular incisors (29 permanent and 32 deciduous) from DS individuals and 55 mandibular incisors (29 permanent and 26 deciduous) from non-DS individuals. Maximum mesiodistal and labiolingual crown dimensions were measured initially, then the crowns were sectioned midsagittally and photographed using a stereomicroscope. Linear measurements of enamel and dentine thickness were obtained on the labial and lingual surfaces of the crowns, together with enamel and dentine-pulp areas and lengths of the dentino-enamel junction. Reduced permanent crown size in DS was associated with a reduction in both enamel and dentine thickness. After adjustments were made for tooth size, DS permanent incisors had significantly thinner enamel than non-DS permanent teeth. The DS permanent teeth also exhibited significant differences in shape and greater variability in dimensions than the non-DS permanent teeth. Crown dimensions of deciduous incisors were similar in size or larger in DS compared with non-DS deciduous teeth. Enamel and dentine thicknesses of the deciduous teeth were similar in DS and non-DS individuals. The findings indicate that growth retardation in DS reduces both enamel and dentine deposition in the permanent incisors but not in the earlier-forming deciduous predecessors. The results are also consistent with the concept of amplified developmental instability for dental traits in DS.
Keywords: Mandible
Dental Enamel
Tooth Crown
Down Syndrome
Description: Published in American Journal of Human Biology, 2001; 13 (5):690-698 at
DOI: 10.1002/ajhb.1107
Appears in Collections:Aurora harvest 2
Dentistry publications

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