Department of Orthodontics, Technical University, Dresden, Germany.
Am J Orthod Dentofacial Orthop. 2011 Apr;139(4 Suppl):S109-16. doi: 10.1016/j.ajodo.2009.12.031.
The aims of this study were to analyze changes in bone density of the midpalatal suture after surgically assisted rapid palatal expansion (SARPE) with the bone-borne Dresden Distractor (DD; ITU, Dresden, Germany) via computed tomography (CT) and to compare of preoperative surgical findings with a control group.
Sixteen adult patients (mean age 24.5 years) underwent axial CT scans before and 7 months after SARPE. CT image fusion was performed for the midpalatal suture bone. Sixty-six controls (mean age 25.7 years) served for comparing age-related bone density. Bone structure and density were assessed in the coronal plane at the anterior, median, and posterior levels.
Highest density was found in the posterior part (1046 Hounsfield units [HU]) before expansion. Seven months after SARPE, bone density was 48% (anterior), 53% (median), and 75% (posterior) compared with preoperative values. The control group showed fairly equal Hounsfield units (889 HU to 900 HU) in all parts.
Seven months after SARPE, the midpalatal suture's density achieves just one half to three quarters of the pretreatment values. To maintain the resistance against forces from the unsplit posterior part, the retention time should be lengthened.
本研究旨在通过计算机断层扫描（CT）分析使用骨内德累斯顿牵开器（DD；ITU，德累斯顿，德国）行外科辅助快速腭扩张（SARPE）后中隔骨密度的变化，并将术前手术发现与对照组进行比较。
16 名成年患者（平均年龄 24.5 岁）在 SARPE 前和 7 个月后进行轴向 CT 扫描。对中隔骨进行 CT 图像融合。66 名对照组（平均年龄 25.7 岁）用于比较与年龄相关的骨密度。在冠状面评估前、中、后水平的骨结构和密度。
在扩张前，最密部分的密度最高（1046 亨氏单位[HU]）。SARPE 后 7 个月，与术前值相比，骨密度分别为 48%（前）、53%（中）和 75%（后）。对照组在所有部位均显示出相当的亨氏单位（889 HU 至 900 HU）。
SARPE 后 7 个月，中隔骨密度仅达到术前值的一半至四分之三。为了保持对未分裂后部分的力的抵抗力，应延长保持时间。
