A Comparative Study On The Location Of The Mandibular Foramen In Panoramic Radiographs Of Normal Occlusion and Mandibular Prognathism

Seo, Byung Seo; Lee, Jae Hoon; Kim, Kyung Wook

Abstract

Due to lack of knowledge in location of the mandibular foramen,it's occasionally occurred the anesthetic failure or the injury of mandibular nerve and vessel during surgery. We took a test setting the mandibular prognathism patient (experimental group, 50 persons) against the patient with normal occlusion (control group, 50 persons)to prevent these problems and to grasp the location change of mandibular foramen according to facial profile. After measuring and comparing the location of mandibular foramen,using panoramic radiographs, we came to following conclusion. There wasn't significance in the antero-posterior location of mandibular foramen between control and experimental group (p>0.05). There was considerable difference in the upper and lower position of mandibular foramen between control and experimental group. It appeared that the distance of mandibular foramen from mandibular notch is 20.66mm (average) for the normal occlusion and 17.785mm(average)for the mandibular prognathism. So we can see the distance of mandibular foramen from mandibular notch for patients is more near 2.815mm (average) than normals. For the distance of mandibular foramen from the extension line of occlusal plane, it's 0.92mm (average) lower than occlusal plane for the normal and 0.5mm (average) upper for the patient. It's located 1.42mm (average) upper part of the patient.