A Morphological Study on Deciduous Teeth in Extremely Low Birth Weight Infants and Very Low Birth Weight Infants

The purpose of this study was to elucidate morphological characteristics of the deciduous teeth of extremely low birth weight infants and very low birth weight infants. The subjects were 50 children of mean age of 4 years and zero month in generally good conditions with birth weights less than 1500...

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Published inThe Journal of Showa University Dental Society Vol. 13; no. 2; pp. 148 - 167
Main Author MURAKAMI, Masaharu
Format Journal Article
LanguageJapanese
Published Showa University Dental Society 30.06.1993
昭和大学・昭和歯学会
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ISSN0285-922X
2186-5396
DOI10.11516/dentalmedres1981.13.148

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Summary:The purpose of this study was to elucidate morphological characteristics of the deciduous teeth of extremely low birth weight infants and very low birth weight infants. The subjects were 50 children of mean age of 4 years and zero month in generally good conditions with birth weights less than 1500 g. They had been treated by the Department of Pedodontics, School of Dentistry, Showa University. The findings were as follows : (1) Analyzing the plaster models, average mesio-distal crown diameters were smaller than the normal value by 1SD for all kinds of deciduous teeth, average labio (bucco)lingual crown diameters were slightly smaller than for almost all kinds of teeth. (2) As for the anomalies of shape, the fused teeth were found at a higher incidences (14. 0%) than in normal children. (3) The incidence of enamel hypoplasia was 41 out of 50 subjects (82. 0%). (4) Enamel hypoplasia teeth were observed more often in maxillary deciduous incisors, and enamel hypocalcification teeth were observed mainly in the maxillary and mandibular deciduous molars. (5) Average microhardness of enamel was VHN (Vickers Hardness Number) 308. 4 and average microhardness of dentin was VHN 42. 9, which were lower than those of normal children. (6) Based on light microscopic observation, the neonatal lines of the sample teeth were positioned closer to the incisal edge of teeth than in the case of the normal teeth and the Retzius line appeared more prominent in the sample teeth than in the normal teeth.
ISSN:0285-922X
2186-5396
DOI:10.11516/dentalmedres1981.13.148