Abstract
Whatever our origins, we are all directly linked by our common ancestors. The brief period that separated the birth of different populations of Homo sapiens that inhabit the Earth explains the homogeneity of the craniofacial architecture of our species. However, some differences to the face show significant interpopulational variations. This is true in the case of dental maturity and the position of the lower incisors, two particularly important factors that mold our orthodontic analysis. This article proposes to do a synthesis of the interpopulational variability of these two parameters.
Highlights
It is possible to read in the table (Fig. 6) the variability of dental maturation for different countries when compared to the Franco-Canadian population
We highlight that Turkish children have the earliest dental maturation (10.38 months) and Venezuelan children have the latest maturation (−1.99 months)
We find that dental maturation in girls is earlier than in boys
Summary
The positioning of the lower incisor may be determined by several angular measurements such as the axis of the incisor in relation to the skull base, Z-angle, i-centroid condy-link, functional occlusal i-plane, i/NB, IMAP, i/GoGn, and the linear ones, such as i-NB, i-APog (Fig. 3).It is important to distinguish between two parameters: the relationship between the ideal position of the lower incisor and its influence on facial esthetics, a perception subject to cultural influence, and the reality of the anatomical position of the lower incisor in the population. That is why, pursuant to the summary table with the results of the studies (Fig. 4), we offer a map of the world, with rounded figures, which may serve as clinical memorandum for orthodontists (Fig. 5)
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