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Résumé -Objectif : L'objectif de cette étude était de mettre en exergue le rôle de l'orthopantomographie dans la prédiction des difficultés rencontrées lors de l'avulsion des troisièmes molaires incluses en utilisant l'échelle de Pederson. Abstract -Difficulties of impacted lower third molar extraction: the role of the orthopantomogram. Introduction: The orthopantomogram allows for the classification of impacted lower third molars according to depth, the spatial relationship with the ramus and the root relationship/mandibular canal. The aim of this study was to show the role of orthopantomography in the prediction of the difficulties encountered in the extraction of impacted lower third molars using the Pederson scale. Material and Method: This was a cross-sectional descriptive study in the Oral Surgery Service of the Dentistry Department at the Cheikh Anta Diop University of Dakar. The study was done between October 2012 and February 2013. 62 patients were involved. Results: The age group 15-25 was the most represented (57%). The mean age of patients was 26 ± 9 years with extremes of 15 and 73 years. Lower third molars with two roots accounted for 92%. Horizontal angulation (44%) and mesial angulation (35%) were the most represented. Half of the sample exhibited a depth of inclusion of position A (54%). The position I represented 40% of cases. In 33% of cases there was no contact between the roots and the mandibular canal. Conclusion: The orthopantomogram allows grading of the difficulty level for third molar extraction, using the Pederson scale. In our sample, extraction was difficult in 69% of the cases, moderate in 21% and easy in 33%.

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The central giant cell granuloma (CGCG) of the jaws is a rare benign tumour of the mandible (lower jaw) and the maxilla (upper jaw) characterized by destruction of the bone, loss of symmetry of the face and displacement of teeth and tooth germs, especially in younger patients. It is asymptomatic and present with slow growth often accompanied by dental mobility. The removal of this tumour is mutilating and is followed prosthetic rehabilitation. The aim of this study was to report a case of central giant cell granuloma localizated to the symphyseal region in a young patient. The case reported is that of a 14-year-old girl who received a consultation for a tumor in the symphysical region causing an aesthetic impact. The tumor was firm, painless and had been developing for about a year. The cortical were broken in places, in transverse, sagittal and coronal sections. The treatment consisted of her excision under general anesthesia causing a significant loss of substance. The tumor mass, very hemorrhagic, was extended to the buccal floor. At the end of the intervention, a significant loss of substance was observed. Two months later, a partial adjunct prosthesis was performed. The anatomo-pathological examination showed of several multinucleated giant cells, a few histiocytes, lymphocytes and fibroblasts. The removal of this aggressive tumour remains mutilating, with significant psychological repercussions. More recently, antiangiogenic therapy with interferon alpha has been successfully applied.