In particular, at the mental foramen, the height from the inferior border of the mandibular canal to the inferior border of the mandible was 13.11 mm and the vertical distance to mental foramen was 8.38 mm. Moreover, at the tip of anterior loop more anteriorly, it was significantly closer to buccal side than the mental foramen. 11 In the present study, at both the mental foramen and the tip of anterior loop, it was also located close to the buccal side. 8 In previous research, the mandibular canal courses close to the lingual side in molar region leans to the buccal side toward the premolar region, 7 8 11 22 and then runs close to the middle portion in incisor region. The positions of the midpoint of mental foramen and the tip of anterior loop were also examined relative to tooth site.Īs the residual bone height is not sufficient for implant placement, the bucco-lingual distance from the mandibular canal is more important.
And, the horizontal distance between the midpoint of mental foramen and the tip of anterior loop, like as the anterior loop length of previous researches, was investigated. At the midpoint of mental foramen, the vertical distance from the inferior border of the mandibular canal to the superior border of the mental foramen was also measured. After that, at both the midpoint of mental foramen and the tip of anterior loop, the bucco-lingual distances from the mandibular canal to external cortex and the height from the inferior border of the mandibular canal to the inferior border of the mandible were measured. 19 that the mean diameters of the mandibular and mental canals are 2.80 and 2.63 mm, respectively, the tip of anterior loop was set a cutoff point of 2 mm for its minimum diameter. On the three-dimensionally reconstructed images, the mandibular and mental canals, mental foramen, and tip of the anterior loop, which coincides with the starting point of the mental canal, were identified.
0 kommentar(er)
