Department of Orthodontics, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN, USA.
College of Dentistry, University of Tennessee Health Science Center, Memphis, TN, USA.
Orthod Craniofac Res. 2020 Nov;23(4):419-426. doi: 10.1111/ocr.12384. Epub 2020 May 21.
To measure and compare the success rate and strains generated during bone- (BRPE) and dental-borne rapid palatal expansion (DRPE) at the alveolar bone, zygomaticomaxillary (ZMS) and internasal (INS) sutures. Additionally, the magnitude and the pattern of midpalatal suture (MPS) separation in the 2 groups was assessed.
The study was performed ex vivo using 28 pig heads.
Heads were dissected, and the MPS, ZMS, INS and the alveolar bone were exposed. A differential-variable-reluctance-transducer (DVRT) was installed across the MPS, and single-element strain gauges were installed at the remaining sites. Expanders were placed and activated at one turn per minute for 30 turns. Strains at the alveolar bone and the sutures and the separation of the MPS were measured.
Successful expansion of the MPS was achieved in 69% of the BRPE subjects compared to 27% in the DRPE group. The average separation of the MPS was higher (230 ± 109 µm per turn vs. 79 ± 61 µm) and the MPS opening happened at an earlier stage of expansion in the BRPE. Higher strains at the ZMS were seen in the BRPE group, while higher strain at the alveolar bone was found in the DRPE group.
The BRPE group demonstrated more successful and effective expansion of the MPS. Higher strain was found at the alveolar bone in the DRPE. A tendency for higher strain at the ZMS was noticed in the BRPE.
测量和比较骨（BRPE）和牙源性快速腭扩张（DRPE）在牙槽骨、颧骨上颌（ZMS）和鼻中隔（INS）缝合处的成功率和产生的应变。此外，还评估了两组中中腭缝（MPS）分离的幅度和模式。
本研究在 28 个头骨上进行了离体研究。
对头骨进行解剖，暴露 MPS、ZMS、INS 和牙槽骨。在 MPS 上安装差动变量磁阻传感器（DVRT），在其余部位安装单元素应变计。以每分钟一转的速度旋转 30 圈扩张器。测量牙槽骨和缝合处的应变以及 MPS 的分离。
BRPE 组中 69%的 MPS 成功扩张，而 DRPE 组中只有 27%。MPS 的平均分离更大（每转 230±109µm 与 79±61µm），BRPE 组的 MPS 开口发生在扩张的早期阶段。BRPE 组的 ZMS 处的应变较高，而 DRPE 组的牙槽骨处的应变较高。
BRPE 组显示出 MPS 更成功和有效的扩张。DRPE 中的牙槽骨处应变较高。BRPE 中 ZMS 处的应变较高。
