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Third maxillary molar prediction for impaction and eruption should be part of the orthodontic treatment planning. In our study we evaluated the reliability of some linear and angular measurements used for the assessment of maxillary third molar status by comparing them before and after orthodontic treatment. 208 upper third molars were analyzed, 148 at patients who undergone non extraction orthodontic treatment and 60 at patients where first premolar extractions were performed.We analyzed on orthopantomograms taken at the beginning and at the end of the orthodontic the ratio between the dimension of the retromolar space and the mesio distal diameter of the third molar, the angle between the long axis of third molar and the occlusal plane and the angle between the long axis of the second and third maxillary molars. We found significant changes in retromolar space dimension after orthodontic treatment with premolars removal and slight average increase in the non extraction group. We didn’t find significant statistical differences before and after orthodontic treatment neither between the angulations of the maxillary third molar with the occlusal plane, nor with the second upper molar (p>0.05) in both groups. The conclusion is that the type of orthodontic treatment has little or no influence upon third molar angulation and this parameter can be used as a predictive factor for third molar status from the beginning of the orthodontic treatment.

Assessment of Maxillary Third Molar Status Before and After Orthodontic Treatment in Adolescent Patients