Abstract
Objectives This study aimed to investigate the potential impact of arch dimensions and unerupted
third molars on mandibular anterior segment crowding.
Materials and Methods This study included a total of 240 subjects with an average age of 18 years seeking
orthodontic treatment. Panoramic radiographs, alginate impressions, and study models
were taken for measurements. This study utilized the Ganss ratio to calculate the
ratio of retromolar space to the width of the crown of the third molar, along with
other measurements such as intercanine and intermolar widths, arch perimeter, and
arch length to assess dental arch dimensions.
Results We found that the Ganss ratio and angle B values on both the right and left sides
were significantly different between the noncrowding and crowding groups, suggesting
a potential role for third molars in mandibular anterior segment crowding. Additionally,
there was an increase in angle A on both sides in the crowding group, indicating a
more acute angle between the anterior teeth. This study also observed a reduction
in the retromolar space on the third molars in the crowding group, further supporting
the potential role of third molars in mandibular anterior segment crowding.
Conclusion The findings of our study provide substantial evidence to suggest that third molars
may contribute to mandibular anterior segment crowding. These findings highlight the
importance of carefully evaluating dental arch dimensions and the presence of third
molars when assessing and treating mandibular anterior segment crowding.
Keywords
arch - crowding - dimensions - third molars
