Antero-posterior positions of teeth in bimaxillary dentoalveolar protrusion

Abstract

Purpose

The purpose of the present study was to investigate the characteristics of the antero-posterior positions of teeth in subjects with Class I bimaxillary dentoalveolar protrusion (BMDP).

Materials and methods

The cephalograms and dental casts of BMDP group (n = 34; 21 females with a mean age of 20.9 ± 3.0 years; 13 males with a mean age of 22.5 ± 2.2 years; interincisal angle less than 125°) and the control group (n = 39; 24 females with a mean age of 20.2 ± 1.6 years; 15 males with a mean age of 23.7 ± 3.1 years; balanced profile) both with Class I molar relationships were analyzed. The distances from the root apexes of the central incisors to the cortical bones of the alveolar process and posterior available space in the maxilla-mandible on the cephalograms in addition to mesiodistal tooth crown diameters, dental arch dimensions, and crown angulation on the dental casts were measured and compared between groups statistically at the 5% level.

Results

Greater and lesser distances of the root apex of the maxillary central incisor to the labial and palatal cortical bones, respectively, as well as greater mesial crown angulations for the maxillary canines and first premolars and the mandibular canines, first and second premolars were observed in BMDP group.

Conclusion

Subjects with BMDP showed a palatally located root apex of the maxillary central incisor and mesially tipped lateral teeth when compared with subjects with normal occlusion and balanced profile from the same ethnic population.

Keywords:

• Bimaxillary dentoalveolar protrusion
• Root apex
• Posterior available space
• Crown angulation