Positional relationship between mandibular third molar and mandibular canal in cone beam computed tomographs
유수경, 이지운, 김경아, 고광준,
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유수경 ( Yu Su-Kyoung ) - 전북대학교 치과대학 구강악안면방사선학교실
이지운 ( Lee Ji-Un ) - 전북대학교 치의학전문대학원 구강악안면방사선학교실
김경아 ( Kim Kyoung-A ) - 전북대학교 치의학전문대학원 구강악안면방사선학교실
고광준 ( Koh Kwang-Joon ) - 전북대학교 치의학전문대학원 구강악안면방사선학교실
KMID : 0896020070370040197
Abstract
Purpose : To provide diagnostic information by evaluation of the positional relationship between the mandibular third molar and the mandibular canal.
Materials & Methods : Eighty-nine mandibular third molars were classified as mesioangular, horizontal, vertical, distoangular groups. The distances between the mandibular third molar and the mandibular canal were measured in cone-beam computed tomographs. The height and width ratios of distances from the mandibular third molar and the mandibular canal to the mandibular inferior border and to the lingual cortical plate were calculated.
Results : The vertical and buccolingual distances between the mandibular third molar and the mandibular canal were 0.03 mm, 2.96 mm in the mesioangular, 0.37 mm, 3.38 mm in the horizontal, -1.50 mm, 1.38 mm in the vertical, -1.10 mm, 4.20 mm in the distoangular group. There were significant differences in vertical (P?0.05), but not in buccolingual (P¤0.05). The height and width ratios of distances on the mandibular third molar were 47.1%, 36.1% in the mesioangular, 47.4%, 34.4% in the horizontal, 37.0%, 46.7% in the vertical, 40.9%, 37.4% in the distoangular group. There were significant differences between the mesioangular and the vertical group, and the horizontal and the vertical group in height ratio (P?0.05), and also between the mesioangular and the vertical group in width ratio (P?0.05). The height and width ratios of distances on the mandibular canal showed no significant
differences between groups (P¤0.05).
Conclusion : The mesioangular group showed the nearest distance between the mandibular third molar and the
mandibular canal vertically. The root apex of the mandibular third molar was positioned more buccally in the vertical group than in the mesioangular group. (Korean J Oral Maxillofac Radiol 2007; 37 : 197-203)
키워드
Tomography; Cone Beam Computed; Mandibular Third Molar; Mandibular Canal
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