Lu Wenhsuan, Zhang Yunfan, Xin Tianyi, Liu Xiaomo, Zhang Xiaoyun, Chen Si, Han Bing
Department of Orthodontics, Cranial-Facial Growth and Development Center, Peking University School and Hospital of Stomatology, 22 Zhongguancun South Avenue, Haidian District, Beijing, 100081, PR China.
National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental Materials, Beijing, 100081, PR China.
BMC Oral Health. 2025 Mar 15;25(1):387. doi: 10.1186/s12903-025-05758-0.
To explore the horizontal impact of extensive incisor retraction on alveolar bone and to investigate the relationship of changes in alveolar bone thickness (ΔBT) with horizontal retraction distance of the incisal edge (HRD) and horizontal retraction distance of alveolar ridge crest (HRD') in orthodontic treatment.
This retrospective study included 84 patients who underwent orthodontic extraction treatment, involving extensive incisor retraction (≥ 3 mm). Pre-treatment (T0) and post-treatment (T1) cone-beam computed tomography (CBCT) data were collected. The samples were divided into adult (> 18 years) and adolescent (≤ 18 years) groups. Changes in the horizontal alveolar bone thickness in the incisor region, as well as changes in HRD and HRD', were measured at T0 and T1. Data were statistically analyzed using SPSS 27.0, utilizing paired and independent samples t-tests.
After extensive retraction, both upper and lower central incisors exhibited increased buccal alveolar bone thickness, while lingual and total alveolar bone thicknesses decreased. The horizontal plane near the root apice exhibited overall thickening of the alveolar bone. The tooth roots consistently remained upright within the alveolar bone, maintaining a stable relative position. The magnitude of ΔBT was smaller compared to the changes in HRD and HRD'.
Alveolar bone thickness decreased during extensive retraction, especially near the alveolar crest, with less noticeable variations closer to the tooth root apices. The stable positioning of incisors within the alveolar bone indicates that the alveolar bone changes were primarily morphological, and suggests that partial tooth movement resulted from bone deformation. (Registration Number: ChiCTR2000034288; Approval Date: 01/07/2020).
探讨广泛切牙后移对牙槽骨的水平影响，并研究正畸治疗中牙槽骨厚度变化（ΔBT）与切缘水平后移距离（HRD）和牙槽嵴顶水平后移距离（HRD'）之间的关系。
本回顾性研究纳入84例接受正畸拔牙治疗且涉及广泛切牙后移（≥3mm）的患者。收集治疗前（T0）和治疗后（T1）的锥形束计算机断层扫描（CBCT）数据。样本分为成人组（>18岁）和青少年组（≤18岁）。在T0和T1测量切牙区水平牙槽骨厚度的变化以及HRD和HRD'的变化。使用SPSS 27.0对数据进行统计分析，采用配对和独立样本t检验。
广泛后移后，上下中切牙颊侧牙槽骨厚度增加，而舌侧和总牙槽骨厚度减小。根尖附近的水平面牙槽骨整体增厚。牙根在牙槽骨内始终保持直立，维持稳定的相对位置。与HRD和HRD'的变化相比，ΔBT的幅度较小。
广泛后移过程中牙槽骨厚度减小，尤其是在牙槽嵴附近，根尖附近变化不明显。切牙在牙槽骨内的稳定定位表明牙槽骨变化主要是形态学上的，提示部分牙齿移动是由骨变形引起的。（注册号：ChiCTR2000034288；批准日期：2020年7月1日）
