Aim: The aim was to find out the relationship between impacted lower second molars (MM2) and length and height of the mandible. Material and method: The retrospective study included 40 patients with unilateral impaction of MM2 (study group) and 40 patients without the impaction (control group). The patients have been treated at the Orthodontics of the Department of Stomatology, Second Faculty of Medicine, Charles University, and University Hospital in Motol, Prague. In all patients on CBCT scans the mandible length between the points gnation – gonion and the mandible height between the points condylion – gonion was measured on the side of impaction as well as on the opposite side. The software Dolphin Imaging 3D 11.95 Premium was used. Then the symmetry of both sides was assessed in each patient. The same method was used in the control group. Results: The length of the mandible on the side with impacted MM2 was significantly shorter than on the opposite non-impacted side (p < 0.0001); the difference in the mandible height was not significant (p = 0.830). The results are proved also by insignificant difference of lateral parameters of the mandible in the control group. Conclusion: The study proved that the mandible is significantly shorter on the side with impacted MM2, however, there is no clinically significant asymmetry.

Ortodontické oddělení Stomatologické kliniky dětí a dospělých FN v Motole Praha

Lateral comparison of the mandible length and height in patients with unilaterally impacted lower second molars

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