Romanos Georgios E, Aydin Erhan, Gaertner Kathrin, Nentwig Georg-Hubertus
Department of Oral Surgery and Implantology, Dental School, Frankfurt, Germany; School of Dental Medicine, Stony Brook University, Stony Brook, NY, USA.
Clin Implant Dent Relat Res. 2015 Feb;17(1):133-41. doi: 10.1111/cid.12084. Epub 2013 May 15.
Prevention of peri-implant bone loss is essential for achieving long-term implant success, but few studies have evaluated the impact of placement depth on long-term bone loss. The aim of this retrospective study was to evaluate outcomes for platform-shifted implants placed at different depths relative to the bone crest.
The mesial and distal shoulders of 228 delayed-loaded Ankylos® (Dentsply Implants Manufacturing GmbH, Mannheim, Germany) implants placed in 85 patients were divided retrospectively into two groups based on the implant shoulder position on the day of placement surgery as follows: subcrestal group A (n = 197; 0.5 mm or more below the crestal bone level) or crestal group B (n = 65; within 0.5 mm or less of the crestal bone level). The remaining sites (n = 194; more than 0.5 mm above the crestal bone level) were supracrestal and were excluded from this analysis. Mesial and distal bone loss was evaluated under 5× magnification and analyzed, along with Periotest values.
Mean Periotest values were -1.77 (±3.57) for Group A and -1.77 (±3.26) for Group B. For Group A, mean mesial (m) bone loss was 1.84 (±1.49 mm) and mean distal (d) bone loss was 1.73 (±1.31 mm). For Group B, the bone loss values were m: 1.41 (±1.65 mm) and d: 1.34 (±1.60 mm). No statistically significant differences were found for the Periotest values (p = .521) or bone level values for the two groups (m: p = .130; d: p = .153).
Within the limitations of this study, subcrestal or crestal implant placement in combination with delayed loading was associated with similar initial implant stability and subsequent crestal bone loss.
预防种植体周围骨丢失对于实现种植长期成功至关重要，但很少有研究评估植入深度对长期骨丢失的影响。本回顾性研究的目的是评估相对于牙槽嵴以不同深度植入的平台转换种植体的效果。
回顾性地将85例患者植入的228颗延迟加载的Ankylos®种植体（德国曼海姆登士柏种植体制造有限公司）的近中肩和远中肩根据种植体植入手术当天的肩部位置分为两组：A组为牙槽嵴下组（n = 197；位于牙槽嵴骨水平以下0.5 mm或更多），B组为牙槽嵴顶组（n = 65；位于牙槽嵴骨水平0.5 mm或以内）。其余部位（n = 194；位于牙槽嵴骨水平以上0.5 mm以上）为牙槽嵴上部位，被排除在本分析之外。在5倍放大倍数下评估并分析近中和远中的骨丢失情况以及Periotest值。
A组的平均Periotest值为-1.77（±3.57），B组为-1.77（±3.26）。对于A组，近中（m）平均骨丢失为1.84（±1.49 mm），远中（d）平均骨丢失为1.73（±1.31 mm）。对于B组，骨丢失值分别为m：1.41（±1.65 mm）和d：1.34（±1.60 mm）。两组的Periotest值（p = 0.521）或骨水平值（m：p = 0.130；d：p = 0.153）均未发现统计学上的显著差异。
在本研究的局限性范围内，牙槽嵴下或牙槽嵴顶植入种植体并结合延迟加载与相似的种植体初始稳定性及随后的牙槽嵴骨丢失相关。
