Abstract：
The recently introduced Implant Disease Risk Assessment (IDRA) identifies a restoration margin-alveolar bone crest (RM-AC) distance of less than 1.5 mm as a key risk factor for peri‑implant disease among eight major risk factors. This study evaluated the impact of the RM-AC distance on marginal bone loss (MBL) through radiographic analysis.
This retrospective cross-sectional study included 77 partially edentulous patients (39 females and 38 males, aged 22 to 76 years) with 202 platform-switched conical connection implants, cement-retained, implant-supported fixed restorations, and bone-level implants placed between 2016 and 2021. Dental implants were followed for least 6 to 36 months at follow up functional loading. Study participants were categorized into Group A (RM-AC distance ≤ 1.5 mm, n = 69) and Group B (RM-AC distance > 1.5 mm, n = 133). Twelve patients in Group B and five patients in Group A had no history of periodontal disease. The MBL was measured radiographically from the most coronal point of the implant shoulder to the alveolar bone, and the RM-AC distance was measured from the restoration margin to the alveolar crest. Multinomial logistic regression analysis was used for statistical evaluation.
The incidence of MBL in Group A was statistically significant and 3.42 times higher than that in Group B. The rate of MBL in periodontitis Stage 4 was found to be 26.31 times higher than that in periodontitis Stage 2. The incidence of MBL was 6.097 and 5.02 times higher with increasing implant diameter and length, respectively.
This study conclusively demonstrates that RM-AC distance ≤ 1.5 significantly increases the risk of MBL, particularly in patients with a history of periodontal disease.
This study highlights the critical role of maintaining an RM-AC distance greater than 1.5 mm in the prevention of MBL, particularly in patients with a history of periodontal disease. Since implant diameter and length have a significant impact on the risk of MBL, it emphasizes that implant demographics should also be carefully evaluated.
This retrospective cross-sectional study included 77 partially edentulous patients (39 females and 38 males, aged 22 to 76 years) with 202 platform-switched conical connection implants, cement-retained, implant-supported fixed restorations, and bone-level implants placed between 2016 and 2021. Dental implants were followed for least 6 to 36 months at follow up functional loading. Study participants were categorized into Group A (RM-AC distance ≤ 1.5 mm, n = 69) and Group B (RM-AC distance > 1.5 mm, n = 133). Twelve patients in Group B and five patients in Group A had no history of periodontal disease. The MBL was measured radiographically from the most coronal point of the implant shoulder to the alveolar bone, and the RM-AC distance was measured from the restoration margin to the alveolar crest. Multinomial logistic regression analysis was used for statistical evaluation.
The incidence of MBL in Group A was statistically significant and 3.42 times higher than that in Group B. The rate of MBL in periodontitis Stage 4 was found to be 26.31 times higher than that in periodontitis Stage 2. The incidence of MBL was 6.097 and 5.02 times higher with increasing implant diameter and length, respectively.
This study conclusively demonstrates that RM-AC distance ≤ 1.5 significantly increases the risk of MBL, particularly in patients with a history of periodontal disease.
This study highlights the critical role of maintaining an RM-AC distance greater than 1.5 mm in the prevention of MBL, particularly in patients with a history of periodontal disease. Since implant diameter and length have a significant impact on the risk of MBL, it emphasizes that implant demographics should also be carefully evaluated.
摘要：
目的：最近推出的种植体疾病风险评估（IDRA）确定，在八个主要危险因素中，修复边缘-牙槽骨骨嵴（RM-AC）距离小于1.5mm是种植体周围疾病的关键危险因素。本研究通过影像学分析评估了RM-AC距离对边缘骨丢失（MBL）的影响。
方法：这项回顾性横断面研究包括77例部分缺牙患者（39例女性和38例男性，22至76岁)，有202个平台转换锥形连接植入物，水泥保留，植入物支撑的固定修复体，和2016年至2021年之间放置的骨骼水平植入物。在随访功能负荷时，对牙齿植入物进行至少6至36个月的随访。研究参与者被归类为A组(RM-AC距离≤1.5mm，n=69)和B组(RM-AC距离>1.5mm,n=133）。B组12例,A组5例患者无牙周病史。从植入物肩关节的最冠状点到牙槽骨的影像学测量MBL，并测量从修复边缘到肺泡c的RM-AC距离。采用多项logistic回归分析进行统计学评价。
结果：A组MBL的发生率具有统计学意义，是B组的3.42倍。发现4期牙周炎的MBL发生率是2期牙周炎的26.31倍。随着种植体直径和长度的增加，MBL的发生率分别为6.097和5.02倍，分别。
结论：这项研究最终证明RM-AC距离≤1.5显著增加MBL的风险，特别是有牙周病史的患者。
结论：这项研究强调了在预防MBL中保持RM-AC距离大于1.5mm的关键作用。特别是有牙周病史的患者。由于植入物直径和长度对MBL的风险有重大影响，它强调植入物的人口统计学也应仔细评估。
方法：这项回顾性横断面研究包括77例部分缺牙患者（39例女性和38例男性，22至76岁)，有202个平台转换锥形连接植入物，水泥保留，植入物支撑的固定修复体，和2016年至2021年之间放置的骨骼水平植入物。在随访功能负荷时，对牙齿植入物进行至少6至36个月的随访。研究参与者被归类为A组(RM-AC距离≤1.5mm，n=69)和B组(RM-AC距离>1.5mm,n=133）。B组12例,A组5例患者无牙周病史。从植入物肩关节的最冠状点到牙槽骨的影像学测量MBL，并测量从修复边缘到肺泡c的RM-AC距离。采用多项logistic回归分析进行统计学评价。
结果：A组MBL的发生率具有统计学意义，是B组的3.42倍。发现4期牙周炎的MBL发生率是2期牙周炎的26.31倍。随着种植体直径和长度的增加，MBL的发生率分别为6.097和5.02倍，分别。
结论：这项研究最终证明RM-AC距离≤1.5显著增加MBL的风险，特别是有牙周病史的患者。
结论：这项研究强调了在预防MBL中保持RM-AC距离大于1.5mm的关键作用。特别是有牙周病史的患者。由于植入物直径和长度对MBL的风险有重大影响，它强调植入物的人口统计学也应仔细评估。
