Topography of the mental foramen in human skulls originating from different time periods.

The location of the mental foramen is used in a number of maxillofacial surgical procedures and in anthropological examinations. The position of the mental foramen has been reported to vary in different ethnic groups and in different historical populations. The aim of this work was to analyse the topography of the mental foramen in mandibles from selected historical populations from the Pomeranian region in Poland. The material consisted of three groups: 92 skulls from the beginning of the 20th century from Szczecin (earlier name Stettin), and two Mediaeval groups -31 skulls from Rurka (historic Rörchen), 18th-19th centuries, and 50 skulls from Sypniewo (historic Zyppnow), 11th-13th centuries. Distances of the mental foramen in relation to the midline, and to the second corresponding point were measured. Additionally, non-metric traits of the mental foramen were recorded. No significant differences in average diameters of the mental foramina measured on the right and the left sides were observed between historical populations. On both sides, in all groups, the foramen was mainly located between positions of the lower first and lower second premolars. In all three groups the direction of the opening of the mental foramen was superoposterior. The similar level of epigenetic variation was observed in all groups. The position and the direction of the exit were similar to other previously studied European populations.