Influence of angulation of lower third molar on its ability to erupt – preliminary report

Aim. The aim of this study was to compare a degree of the third lower molar state of eruption or retention according to its angulation. There was a group of adolescent patients studied, who needed an orthodontic treatment and sought help in Orthodontic Ward of the Medical University of Gdansk. Material and methods. Panoramic pictures of 50 patients (36 women and 14 men) were qualified to be measured for the amount of the third lower molars and their angulation, which was described as an external angle between a long axis of the tooth according to a bite line. Results. The amount of third lower molars was defined and revealed that 30 women (83%) had both lower molars, 14 men (100%) had left third lower molar while only 11 men (79%) had a right wisdom tooth. The angulation was determined for both women and men – the angle of the erupted lower third molar oscillated between 31° and 88° (on average 56° +/- 12°) whereas for the retained: from 3° to 90° (average 52° +/- 26°). An observation was made that the lower third molars were usually erupted when their angulation was in the 40° to 70° range. Conclusions. 1. Angulation of the lower third molar has an influence on its ability to erupt. 2. Too big, as well as too small angle of angulation may have a negative influence on the ability of the tooth to erupt. 3. The sex does not have an influence on the state of the tooth eruption.