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Dental magnetic resonance imaging: study of impacted mandibular third molars
Dentomaxillofacial Radiology , 08/25/09

Ferretti F et al. – Owing to the possibility of inferior alveolar nerve injury during oral surgery, where dental panoramic radiography is not sufficient to demonstrate the relationships between mandibular third molar teeth and the mandibular canal, a dental CT scan is often needed; however, in young patients, to avoid high levels of radiation dose, MRI of the jaw may be useful.

Exclusive Author Commentary
Fabio Ferretti, 08/26/09

There is a paucity of literature about MRI in dental studies,5–7 as far as we know, but validation of MRI in the localization of the mandibular canal and its internal anatomical structures has already been established by Nasel et al8 and Ikeda et al,9 who studied these structures on cadavers. MRI is useful for visualizing various parts of the human body. It has several advantages over conventional radiographic and CT imaging modalities: in fact, it has superior soft-tissue contrast resolution and does not require the use of non-invasive characteristics and ionizing radiation. In the present study, we attempted to apply these advantages to emphasize the relationships between the mandibular third molar teeth and the mandibular canal and to assess the possibility for routine use of MRI for this purpose. The paucity of scientific studies in this field attests to the relative difficulty of developing models to examine the application of MRI to the study of impacted third molars. We tried to establish a technical imaging protocol for the purpose, although further studies are required. This protocol demonstrated the ability to directly delineate the features of the third molar, the course of the mandibular canal and their relationships, as suggested by other authors (Eggers.. Nasel)

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