Department of Periodontics, University of Washington, Seattle, WA, USA.
Department of Oral Health Sciences, University of Washington, Seattle, WA, USA.
J Clin Periodontol. 2018 Feb;45(2):225-232. doi: 10.1111/jcpe.12829. Epub 2017 Dec 5.
The purpose of this study was to determine whether restoration emergence angle was associated with peri-implantitis.
A data set consisting of 96 patients with 225 implants (mean follow-up: 10.9 years) was utilized. Implants were divided into bone-level and tissue-level groups, and radiographs were analysed to determine the restoration emergence angles, as well as restoration profiles (convex or concave). Peri-implantitis was diagnosed based on probing depth and radiographic bone loss. Associations between peri-implantitis and emergence angles/profiles were assessed using generalized estimating equations.
Eighty-three patients with 168 implants met inclusion criteria. The prevalence of peri-implantitis was significantly greater in the bone-level group when the emergence angle was >30 degrees compared to an angle ≤30 degrees (31.3% versus 15.1%, p = .04). In the tissue-level group, no such correlation was found. For bone-level implants, when a convex profile was combined with an angle of >30 degrees, the prevalence of peri-implantitis was 37.8% with a statistically significant interaction between emergence angle and profile (p = .003).
Emergence angle of >30 degrees is a significant risk indicator for peri-implantitis and convex profile creates an additional risk for bone-level implants, but not for tissue-level implants.
本研究旨在确定修复体的边缘骨水平与种植体周围炎之间的关系。
本研究纳入了 96 名患者共 225 枚种植体（平均随访时间：10.9 年）。将种植体分为骨水平组和软组织水平组，通过 X 线片分析确定修复体的边缘骨水平和修复体的颊舌向倾斜角度（凸或凹）。根据探诊深度和 X 线片骨吸收情况诊断种植体周围炎。采用广义估计方程评估种植体周围炎与边缘骨水平/修复体颊舌向倾斜角度之间的关系。
符合纳入标准的患者为 83 名，共 168 枚种植体。与边缘骨水平≤30 度的种植体相比，边缘骨水平＞30 度的种植体周围炎发生率更高（31.3%比 15.1%，p=0.04），且这种差异在骨水平种植体中更为显著。在软组织水平种植体中，未发现这种相关性。对于骨水平种植体，当凸面外形与倾斜角度＞30 度相结合时，种植体周围炎的发生率为 37.8%，且颊舌向倾斜角度和修复体外形之间存在显著的交互作用（p=0.003）。
＞30 度的修复体边缘骨水平是种植体周围炎的一个显著危险因素，凸面外形增加了骨水平种植体发生种植体周围炎的风险，但对软组织水平种植体无影响。
