Pedersen MH, et al. - Authors assessed the long-term morbidity after coronectomy, with sensory disturbances of the inferior alveolar nerve (IAN) and root migration as the primary outcome variables. Signs of migration were demonstrated in 97% of the retained roots and signs of rotation were seen in 65%. Hence, a safe treatment modality with a good long-term prognosis was coronectomy of the mandibular third molars with an intimate relationship to the mandibular canal.