Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI.
J Periodontol. 2021 Apr;92(4):536-546. doi: 10.1002/JPER.20-0327. Epub 2020 Sep 25.
Clinical data on the restorative designs affecting the early progression of peri-implantitis are scarce. The aim of this retrospective study was to evaluate the influence of several restorative factors (e.g., restoration emergence angle, and internal screw length/diameter) on the marginal bone loss around implants with peri-implantitis.
Implants diagnosed with peri-implantitis having 1- (T1) and 2-year (T2) follow-ups were included. In addition, within 6 months pre-diagnosis (Tb), all cases required to have full documentation in which no evidence of peri-implantitis was not indicated. Changes in marginal bone levels (MBLs) from Tb to T1 and from T1 to T2 were evaluated. The effect of several variables on MBLs changes was assessed via univariate and multivariate generalized estimating equations.
Eighty-three bone-level implants from 65 patients were selected. The mean follow-up before peri-implantitis diagnosis was 99.47 ± 47.93 months. The radiographic mean marginal bone loss was 1.52 ± 1.33 mm (Tb to T1) and 0.58 ± 0.52 mm (T1 to T2). Restoration emergence angle and frequency of maintenance visits significantly affected MBLs from Tb to T1. Besides, 66.3% of the included implants' bone levels were in a zone within 1 mm of the apical end of the internal screw at T1 and remained in this zone during the second follow-up year.
Significant marginal bone loss occurred in the early post-diagnosis period of peri-implantitis, which could be affected by the restoration emergence angle. Peri-implant MBLs were frequently located in a zone within 1 mm of the apical end of the internal screw.
关于影响种植体周围炎早期进展的修复设计的临床数据很少。本回顾性研究的目的是评估几种修复因素（如修复体暴露角度和内部螺丝的长度/直径）对患有种植体周围炎的种植体周围边缘骨丧失的影响。
本研究纳入了诊断为种植体周围炎的种植体，这些种植体分别有 1 年（T1）和 2 年（T2）的随访。此外，在诊断前 6 个月（Tb），所有病例都需要有完整的记录，记录中没有显示种植体周围炎的证据。评估从 Tb 到 T1 和从 T1 到 T2 的边缘骨水平（MBLs）变化。通过单变量和多变量广义估计方程评估几个变量对 MBLs 变化的影响。
从 65 名患者中选择了 83 个骨水平种植体。在诊断为种植体周围炎之前的平均随访时间为 99.47 ± 47.93 个月。放射学平均边缘骨丧失量为 1.52 ± 1.33 mm（Tb 至 T1）和 0.58 ± 0.52 mm（T1 至 T2）。修复体暴露角度和维护就诊频率显著影响从 Tb 到 T1 的 MBLs。此外，在 T1 时，66.3%的种植体的骨水平位于内部螺丝根尖 1mm 范围内，在第二年的随访中仍保持在该范围内。
在种植体周围炎的早期诊断后，发生了显著的边缘骨丧失，这可能受到修复体暴露角度的影响。种植体周围 MBLs 经常位于内部螺丝根尖 1mm 范围内。
