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Int. J. Environ. Res. Public Health 2017, 14(6), 621;

Occlusal Features and Caries Experience of Hong Kong Chinese Preschool Children: A Cross-Sectional Study

School of Stomatology, Kunming Medical University, Yunnan 650031 China
Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
Author to whom correspondence should be addressed.
Academic Editors: Loc Do and Jane Scott
Received: 16 April 2017 / Revised: 6 June 2017 / Accepted: 7 June 2017 / Published: 9 June 2017
(This article belongs to the Special Issue Epidemiology and Determinants of Dental Caries in Children)
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Objective: To study occlusal features and their relation to caries experience in Hong Kong Chinese preschool children. Methods: Seven kindergarten classes in Hong Kong were selected using a stratified random sampling method, and the 4- and 5-year-old Chinese kindergarten children were invited to join the survey. Two calibrated dentists performed the clinical examinations in the kindergartens. Occlusion features, including incisal overjet; canine and molar relationship; median diastema; and primate space as well as malocclusion features, including crossbite; anterior open bite; and scissor bite, were recorded. Caries experience was recorded with the dmft index. Results: A total of 538 children were invited to participate in the study, and finally 495 children were examined (92%). Approximately half (52%) had a normal incisor relationship. Most children had a class I canine relationship (left-79%; right-75%). Approximately two-thirds had a flush terminal plane (left-64%; right-65%). Most children (76%) had a maxillary primate space, and 47% had a mandibular primate space. The prevalence of median diastema, anterior crossbite, and unilateral posterior crossbite was 30%, 12% and 1%, respectively. No bilateral posterior crossbite or scissor bite was found. Approximately half (49%) had caries experience. The mean dmft score was 2.1. Gender and age were not associated with either the studied occlusal features or the mean dmft score (p > 0.05). Conclusion: Approximately half of the Hong Kong preschool children studied had a normal occlusion, and two-thirds of them had a flush terminal plane. About three-quarters of them had a maxillary primate space, and half of them had a mandibular primate space. Their occlusal traits were not associated with caries experience and prevalence. View Full-Text
Keywords: occlusal features; malocclusion; caries; children; primary teeth occlusal features; malocclusion; caries; children; primary teeth
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Zhang, S.; Lo, E.C.M.; Chu, C.H. Occlusal Features and Caries Experience of Hong Kong Chinese Preschool Children: A Cross-Sectional Study. Int. J. Environ. Res. Public Health 2017, 14, 621.

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