Anatomical position of the mandibular canal in relation to the buccal cortical bone: relevance to sagittal split osteotomy

Abstract

ObjectivesClassification of the degree of postoperative nerve damage according to contact with the mandibular canal and buccal cortical bone has been studied, but there is a lack of research on the difference in postoperative courses according to contact with buccal cortical bone. In this study, we divided patients into groups according to contact between the mandibular canal and the buccal cortical bone, and we compared the position of the mandibular canal in the second and first molar areas.Materials and MethodsClass III patients who visited the Dankook University Dental Hospital were included in this study. The following measurements were made at the second and first molar positions: (1) length between the outer margin of the mandibular canal and the buccal cortical margin (a); (2) mandibular thickness at the same level (b); (3) Buccolingual ratio=(a)/(b)×100; and (4) length between the inferior margin of the mandibular canal and the inferior cortical margin.ResultsThe distances from the canal to the buccal bone and from the canal to the inferior bone and mandibular thickness were significantly larger in Group II than in Group I. The buccolingual ratio of the canal was larger in Group II in the second molar region.ConclusionIf mandibular canal is in contact with the buccal cortical bone, the canal will run closer to the buccal bone and the inferior border of the mandible in the second and first molar regions.

Automatic mandibular canal detection using a deep convolutional neural network

“…Furthermore, the contrast is lower than that of CT, which makes detecting anatomical structures 25 automatically, comparatively harder. 2) Since the mandibular canal travels in various directions in three dimensions 26,27 , it is difficult to know the exact shape of the canal in a single direction. The challenging part is the change in the location and shape of the mandibular canal in cross-section images due to changes in the head position.…”

Orthognathic Surgery in Goldenhar Syndrome With a Rare Course of the IAN

“…Traditionally, the IAN traverses the mandible through the mandibular foramen, the inferior alveolar canal, and exits through the mental foramen to provide sensory innervation to the lower lip and chin. This canal, on average, resides 4.9 mm from the buccal cortical margin and 17.4 mm from the alveolar crest 35. Intra-operatively, the left IAN was not found within the distal segment.…”

“…This canal, on average, resides 4.9 mm from the buccal cortical margin and 17.4 mm from the alveolar crest. 35 Intra-operatively, the left IAN was not found within the distal segment. Instead, the nerve was noted to exit the mandible through the lateral cortex of the ascending ramus posterior to the external oblique ridge (Fig.…”

Cross sectional analysis of mandibular anthropometric points using CBCT to derive biometric measurements for a safer approach to mandible osteotomies

“…Lee et al [28] evaluated 58 facial CT scans and found the mean value of the horizontal length between the inferior alveolar canal and the buccal cortical bone as 5.9-6.8 mm and mandibular thickness at the same level with a mean value of 10.7 mm to 12 mm. Line A' and Line A respectively of our study have also shown similar mean values.…”