Assessment of Posterior Teeth Angulation in Patients with Anterior Open- Bite and Normal Overbite

Objective: The study aimed to assess the mesiodistal angulation of posterior teeth in patients with anterior open bite. Materials and Methods : lateral cephalograms of 80 untreated subjects were selected and grouped into normal overbite and open bite. Gender dimorphism was investigated in the open bite group. Mesiodistal angulations of posterior teeth were measured on the cephalometric radiographs and the mean results were recorded and compared using independent t -tests. Results: For the upper and lower premolar teeth and in relation to the BOP, a significant difference was found in the mesiodistal angulations between both normal overbite and open bite groups being less in the open bite group than the normal overbite group. No significant difference in the mesiodistal angulations of the upper and lower premolars in relation to the PP and MP respectively. Regarding the mesiodistal angulation of the maxillary and mandibular molars, and in relation to the BOP, no significant difference was found between the two groups. As for the mesiodistal angulations of the maxillary and mandibular molars in relation to the PP and MP respectively, a significant difference was found between both groups being less in the open bite group than the normal overbite group. Conclusion : Maxillary and mandibular premolars have greater mesial angulations in patients with anterior open bite. Conversely, maxillary and mandibular molars exhibit greater distal angulations in patients with anterior open bite. Female subjects with anterior open bite tend to have greater mesial angulations of the posterior teeth as compared to male subjects.