Longitudinal analysis of deciduous tooth emergence: IV. Covariate effects in Japanese children.
ABSTRACT Emergence of the deciduous teeth is generally considered to be robust to moderate environmental insults, malnutrition, and disease. Consequently, deciduous tooth emergence has been used to assess growth and development and for age estimation in children. In this paper, we examine the way in which nutritional status and other covariates affect deciduous tooth emergence in a sample of 114 Japanese children born in Tokyo in 1914 and 1924. Parametric survival analysis was used to quantify the effects of nutritional status, breastfeeding behavior, and sex on the hazard of deciduous tooth emergence. Children of poor nutritional status exhibited significantly delayed emergence of all deciduous teeth, with effects that ranged from 14-29% increases in mean emergence times. Children of medium nutritional status exhibited increases in mean emergence times of 5-9% for the canines and lower molars, and 13-17% for the incisors. Partial breastfeeding had no effect on tooth emergence, but children who were not breastfed at all showed delayed emergence of the upper incisors. No significant sex differences in emergence were found. The findings contradict the idea that moderate malnutrition has little effect on deciduous tooth emergence. Furthermore, nutritional differences may account for some of the observed differences among populations in the timing of tooth emergence.
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ABSTRACT: The number of deciduous teeth in a sample of rural Ladino Guatemalan children was counted every 3 months through 24 months of age, and at 6-month intervals from 24 to 36 months. Nutritional status at birth, whether expressed as full-term birth weight or as maternal caloric supplementation during pregnancy, influences the timing of deciduous tooth eruption. Furthermore, the timing of deciduous tooth eruption seems more closely associated with postnatal weight than with birth weight. Although indices of nutritional deficiencies are associated with retarded tooth eruption, the use of mean number of deciduous teeth erupted as an estimate of mean chronological age in populations living under conditions of mild-to-moderate malnutrition is relatively accurate because errors of age estimation based on mean values for the present sample only vary between 1 and 2 months.American Journal of Clinical Nutrition 04/1975; 28(3):216-24. · 6.50 Impact Factor
- British Journal Of Nutrition 06/1968; 22(2):307-14. · 3.30 Impact Factor
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ABSTRACT: Dental records of 635 West African (Gambian) children within the age range of 4.5-14 yr yielded 2108 examinations for boys and 1863 for girls. There was no difference between eruption ages of homologous permanent teeth on the left and the right side of the same jaw. Except for PM1 and PM2, teeth in the lower jaw erupted earlier. There was a clear sex difference in eruption age, which was earlier in females. Calendar age can be estimated from the state of permanent dentition, though the error of the estimate increases with the number of teeth, being about 0.5 years for 1 or 2 teeth and increasing to slightly over 1 year for 12 teeth or more. There was an association between the number of teeth erupted at a given age and height and weight of the children. Also children with fewer teeth at a given age contain a greater proportion of children below standard weight or height for that age. This effect disappeared when children were classified in terms of weight for height.Annals of Human Biology 05/1975; 2(2):117-28. · 1.48 Impact Factor