Tabrizi Reza, Mohajerani Hassan, Moslemi Hamidreza, Shafiei Shervin, Majdi Shobeir
Dept. of Oral and Maxillofacial Surgery, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Postgraduate student Dept. of Oral and Maxillofacial Surgery, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
J Dent (Shiraz). 2023 Jun;24(2):200-205. doi: 10.30476/dentjods.2022.92419.1641.
Alveolar ridge resorption after tooth extraction may interfere with optimal dental implant placement.
This study aimed to compare the marginal bone loss (MBL) and thickness of the buccal aspect of the augmented site in simultaneous versus delayed implant placement following lateral ramus horizontal ridge augmentation in the posterior mandible.
This prospective cohort study was conducted on patients who required horizontal bone augmentation of the posterior mandible using lateral ramus autogenous bone graft. Patients were divided into two groups of simultaneous implant placement (group 1) and delayed implant placement (group 2). Cone-beam computed tomography (CBCT) images were obtained before augmentation, at the time of implant placement, and 10 months later (6 months after implant loading). MBL and thickness of the buccal aspect were evaluated over time.
There were 18 patients in the group 1 and 16 patients in the group 2. Analysis of the CBCT scans demonstrated that the mean MBL was 1.21±0.35mm in the group 1 and 1.08±0.19mm in the group 2, with no significant difference between the two groups (= 0.19). Thickness of the buccal aspect of the augmented site at the time of implant placement was 1.85±0.20mm in the group 1 and 2.16±0.29 mm in the group 2, with a significant difference (< 0.001). However, data analysis regarding changes in the buccal plate thickness showed no significant difference between the two groups (= 0.36).
According to the results of this study, there was no significant difference in M-BL and post-operative changes in the thickness of the buccal aspect of the augmented sites with onlay lateral ramus bone blocks between simultaneous and delayed implant placement.
拔牙后牙槽嵴吸收可能会影响种植牙的最佳植入。
本研究旨在比较下颌后牙区行外侧升支水平骨增量术后同期与延期种植时，种植位点颊侧边缘骨吸收（MBL）及增量区颊侧骨板厚度。
本前瞻性队列研究纳入需要使用外侧升支自体骨移植进行下颌后牙区水平骨增量的患者。患者分为同期种植组（第1组）和延期种植组（第2组）。在骨增量术前、种植时以及10个月后（种植体加载6个月后）获取锥形束计算机断层扫描（CBCT）图像。随时间评估MBL和颊侧骨板厚度。
第1组有18例患者，第2组有16例患者。CBCT扫描分析显示，第1组平均MBL为1.21±0.35mm，第2组为1.08±0.19mm，两组间无显著差异（P = 0.19）。种植时增量区颊侧骨板厚度在第1组为1.85±0.20mm，第2组为2.16±0.29mm，差异有统计学意义（P<0.001）。然而，关于颊侧骨板厚度变化的数据分析显示两组间无显著差异（P = 0.36）。
根据本研究结果，在下颌后牙区行外侧升支骨块覆盖式骨增量后，同期与延期种植时，种植位点的MBL以及增量区颊侧骨板厚度的术后变化无显著差异。
