Lim J E, Lee S J, Kim Y J, Lim W H, Chun Y S
School of Clinical Dentistry, Ewha Womans University, Seoul, Korea.
Orthod Craniofac Res. 2009 Nov;12(4):299-304. doi: 10.1111/j.1601-6343.2009.01465.x.
To compare maxillary and mandibular cortical bone thickness and rootic proximity for optimal mini-implant placement.
CT images from 14 men and 14 women were used to evaluate buccal interradicular cortical bone thickness and root proximity from mesial of the central incisor to the 2nd molar. Cortical bone thickness was measured at 0 degrees , 15 degrees , 30 degrees , and 45 degrees angles relative to the root surface using three-dimensional images.
For the cortical bone thickness, there was no statistically significant difference between the maxilla and the mandible in the anterior area; however, there was a significant difference in the posterior area. Cortical bone in the maxilla, mesial and distal to canine interradicular sites, was thickest while thickness in the mandible exhibited a gradual anterior to posterior increase. Cortical bone thickness in the maxilla increased as both level and angle increased, while the cortical bone thickness in the mandible was greatest at 4 mm from the alveolar crest. Root proximity mesial and distal to 2nd premolar interradicular sites was greatest.
Based on our results, cortical bone thickness depends on the interradicular site rather than sex or individual differences.
比较上颌骨和下颌骨皮质骨厚度及牙根间距，以确定最佳微型种植体植入位置。
使用14名男性和14名女性的CT图像，评估从中央门牙近中至第二磨牙的颊侧根间皮质骨厚度和牙根间距。使用三维图像在相对于牙根表面0度、15度、30度和45度角处测量皮质骨厚度。
对于皮质骨厚度，上颌骨和下颌骨在前部区域无统计学显著差异；然而，在后部区域存在显著差异。上颌骨中，犬牙根间部位近中和远中的皮质骨最厚，而下颌骨中的厚度从前向后逐渐增加。上颌骨的皮质骨厚度随水平和角度增加而增加，而下颌骨的皮质骨厚度在距牙槽嵴4毫米处最大。第二前磨牙根间部位近中和远中的牙根间距最大。
根据我们的结果，皮质骨厚度取决于根间部位，而非性别或个体差异。
