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Biological Interpretation of the Correlation of Emergence Times of Permanent Teeth

¹ Department of Biostatistics, University of Aarhus, 6 Vennelyst Boulevard, DK-8000 Århus C, Denmark;
² Department of Computer Science, School of Dentistry, University of Aarhus, Denmark;
³ Department of Orthodontics, School of Dentistry, University of Copenhagen, Denmark; and
⁴ Department of Community Oral Health and Pediatric Dentistry, School of Dentistry, University of Aarhus, Denmark;

* corresponding author, parner{at}biostat.au.dk

The eruption mechanism is not fully understood. It is known that the dental follicle is essential and that experimentally provoked denervation influence the process of eruption. Accordingly, the purpose of this study was to elucidate the eruption pattern in a human population and relate this pattern to the pattern of jaw innervation. The eruption pattern was evaluated from the correlation between the emergence times of different teeth in the permanent dentition based on longitudinal data from a large national registry (12,642 boys and 12,095 girls). Correlations coefficients were generally high (>0.5) and higher between teeth within the same tooth groups (i.e. incisors, canines and premolars, and molars) than between teeth from different tooth groups. It was shown that the correlation in emergence of teeth closely followed the pattern of innervation of the jaws. Thus the study supported the hypothesis concerning a possible association between eruption and innervation.

KEY WORDS: emergence • permanent teeth • correlation • tooth innervation

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