A longitudinal study of time trends in the eruption of permanent teeth in Danish children.
The purpose was: (1) to estimate mean eruption times of permanent teeth in Danish schoolchildren for the birth cohorts from 1969 to 1982; and (2) to determine any time trends in eruption. For teeth with a low proportion of aplasia, the distribution of the eruption time was close to normal. For teeth with a higher proportion of aplasia there was a slight deviation from the normal distribution in the right-hand part of the distribution. For erupted teeth, the time to eruption was, however, again very close to the normal distribution. A small, but statistically significant, increase in mean eruption times was found for both sexes and almost all teeth. Averaged over all teeth the increase was 1.5 days per year (95% CI: 0.9--2.2) for boys and 2.6 days per year (95% CI: 2.2--2.9) for girls.
Parner
E T
ET
Department of Biostatistics, University ofAarhus, 6 Vennelyst Boulevard, DK-8000 Arhus C, Denmark. parner@biostat.au.dk
Heidmann
J M
JM
Vaeth
M
M
Poulsen
S
S
D000293:Adolescent; D000367:Age Factors; D002648:Child; D003718:Denmark; D019229:Dentition, Permanent; D005260:Female; D006801:Humans; D016013:Likelihood Functions; D016014:Linear Models; D008137:Longitudinal Studies; D008297:Male; D013997:Time Factors; D014078:Tooth Eruption / Q000502:physiology*