School of Dentistry and Graduate Program of Dental Science, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Oral and Maxillofacial Surgery, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
School of Dentistry and Graduate Program of Dental Science, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
J Formos Med Assoc. 2021 Jan;120(1 Pt 3):697-704. doi: 10.1016/j.jfma.2020.07.030. Epub 2020 Aug 1.
BACKGROUND/PURPOSE: The neurosensory disturbance is a common complication following sagittal split ramus osteotomy (SSRO) whereas the shortest buccal bone marrow (SBM) is an important risk factor. The present study aimed to investigate the relationship between the occurrence rates of SBM among three skeletal patterns.
The cone-beam computed tomography (CBCT) images of 90 participants were divided into skeletal Class I, II, and III. There were six horizontal planes separated apart by a 2 mm interval; it started with plane 0 (original intact mandibular canal) to plane 5 which was 10 mm below. The data of SBM were divided into two groups (SBM ≥ 1 mm and SBM < 1 mm). With an SBM value < 1 mm, we defined a high occurrence rate of postoperative neurosensory abnormality or unfavorable split.
The Class III patients had the smallest SBM value (1.31-1.75 mm) whereas the Class II patients had the largest SBM value (1.57-2.09 mm). For the Class III patients, the highest and lowest occurrence rates of SBM were 56.5% and 43.5% respectively. For the Class II patients, the highest and lowest occurrence rates of SBM were 37.1% and 17.7% respectively. The patients with Class III malocclusion had higher occurrence rates of SBM than the patients with Class II malocclusion.
Class III had a significantly higher occurrence of probability (SBM < 1 mm) than Class II. Therefore, patients with Class III were more likely to experience postoperative neurosensory abnormalities and unfavorable split than patients with Class II.
背景/目的： 神经感觉障碍是下颌升支矢状劈开截骨术（SSRO）后的常见并发症，而最短颊骨髓（SBM）是一个重要的危险因素。本研究旨在探讨三种骨骼形态中 SBM 发生率之间的关系。
将 90 名参与者的锥形束计算机断层扫描（CBCT）图像分为骨骼 I 类、II 类和 III 类。有六个水平平面，间隔 2 毫米；从平面 0（原始完整下颌管）开始到 10 毫米以下的平面 5。SBM 数据分为两组（SBM≥1mm 和 SBM<1mm）。当 SBM 值<1mm 时，我们定义术后神经感觉异常或不利分裂的高发生率。
III 类患者的 SBM 值最小（1.31-1.75mm），而 II 类患者的 SBM 值最大（1.57-2.09mm）。对于 III 类患者，SBM 的最高和最低发生率分别为 56.5%和 43.5%。对于 II 类患者，SBM 的最高和最低发生率分别为 37.1%和 17.7%。III 类错颌患者 SBM 的发生率高于 II 类错颌患者。
III 类发生概率（SBM<1mm）明显高于 II 类。因此，III 类患者比 II 类患者更有可能出现术后神经感觉异常和不利分裂。
