Evaluation of the mesiodistal angulations of lower canines, pre-molars and molars with and without lower third molars

Rodrigo Castellazzi SELLA, Marcos Rogério de MENDONÇA, Osmar Aparecido CUOGHI

Objectives: The purpose of the present research was to compare the normal average values of the mesiodistal axial angulation, proposed by Ursi in 1989, with the mesiodistal axial angulation of canine teeth, pre-molars and lower molars in individuals with and without the presence of the third lower molars and ages between 18 and 25 years. Additionally, the values of the mesiodistal axial angulation of these teeth were compared in these two situations. Methods: Forty panoramic x-rays were used from individuals of both sexes who had not received orthodontic treatment. These subjects were divided into two groups: Group I, containing 20 x-rays that didn’t present third lower molars and Group II, formed of 20 x-rays with the presence of the third lower molars. Results and Conclusions: Through statistical analysis of the results, it was concluded that both Groups exhibited lower pre-molars and molars with enhanced angulation in the mesial direction, when compared to normal occlusion. On the other hand, the mesiodistal axial angulation of lower canine teeth was shown to be similar to the angulation presented in cases of normal occlusion. The two Groups, when compared together, exhibited similar angular values of the canine teeth, pre-molars and lower molars, indicating that the presence of the third molars didn’t exercise an influence on these dental angulations.

Keywords: Third molar. Panoramic radiography. Dental angulation. Tooth movement.

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