Division of Oral Radiology, Department of Propedeutics and Integrated Clinic, School of Dentistry, Federal University of Bahia, Salvador, Brazil.
Orthod Craniofac Res. 2021 Mar;24 Suppl 1:83-91. doi: 10.1111/ocr.12463. Epub 2021 Jan 19.
To evaluate bone height and thickness in the mandibular buccal shelf region and to compare differences between anatomical sites according to gender, side and vertical and sagittal skeletal patterns.
Multislice computed tomography (MSCT) images of 94 subjects (51 females and 43 males) were previously obtained as part of preoperative planning for orthognathic surgery.
Measurements were performed in three different regions of the mandibular buccal shelf: mesially, towards the central groove and distally to the second molars. Bone thickness measurements were obtained perpendicularly 3, 5 and 7 mm below the bone crest towards the mandible outer cortex. Bone height was measured 3 mm away from the bone crest perpendicularly to the outer cortex of the base of mandible.
There was an increase in bone thickness in the posterior and basal directions. The increase in bone thickness ranged from 1.8 to 7.1 mm. Greater bone height was found in the anterior direction. The increase in bone height ranged from 17.5 to 22.5 mm. Hypodivergent and Class III subjects showed significantly greater bone thickness (P < .05). Significantly greater bone height was found mesially to the second molar in Class III subjects compared with Class I subjects (P < .05) and in hyperdivergent males compared with hypodivergent males (P < .05).
The region distal to the second molar is the most appropriate for the insertion of extra-alveolar mini-screws in terms of bone thickness. Hypodivergent and Class III subjects showed greater bone thickness in the mandibular buccal shelf region.
评估下颌颊棚区的骨高度和骨厚度，并根据性别、侧别以及垂直和矢状骨型比较解剖部位之间的差异。
多排螺旋 CT（MSCT）图像来自 94 名患者（51 名女性和 43 名男性），这些患者是正颌手术术前计划的一部分。
在下颌颊棚区的三个不同部位进行测量：近中、向中央沟和远中第二磨牙。在骨嵴下方 3、5 和 7mm 处，垂直于下颌骨外皮质测量骨厚度。在距骨嵴 3mm 处，垂直于下颌骨基底的外皮质测量骨高度。
骨厚度在后向和底部方向增加。骨厚度增加范围为 1.8 至 7.1mm。在前向发现了更大的骨高度。骨高度增加范围为 17.5 至 22.5mm。低角和 III 类患者的骨厚度显著增加（P<.05）。与 I 类患者相比，III 类患者第二磨牙远中部位的骨高度显著增加（P<.05），与低角男性相比，高角男性的骨高度显著增加（P<.05）。
就骨厚度而言，第二磨牙远中区域是牙槽外微型螺钉植入的最佳部位。低角和 III 类患者下颌颊棚区的骨厚度较大。
