Hameed Muhammad-Hasan, Khan Farhan-Raza, Ghafoor Robia, Azam Syed-Iqbal
Resident, Department of Dentistry, Aga Khan University Hospital, Karachi, Pakistan.
Associate Professor, Department of Dentistry, Aga Khan University Hospital, Karachi, Pakistan.
J Clin Exp Dent. 2018 Oct 1;10(10):e949-e954. doi: 10.4317/jced.55194. eCollection 2018 Oct.
Implant-supported fixed restorations are considered as the standard treatment for replacement of missing teeth. These can be either screw or cement retained. The success or failure of implant restorations depend upon amount of marginal bone loss (MBL). The present study is to determine the MBL around cement and screw-retained implant prosthesis and to determine various predictors of the MBL.
A retrospective charts review was conducted at the dental clinics, Aga Khan University Hospital, Karachi from February 2017 to June 2017 in which 104 implants restorations were assessed using periapical radiographs. MBL was calculated at baseline and at 12 months and the difference was recorded on a proforma. SPSS version 21.0 was used for statistical analysis. Descriptive statistics was computed. Generalized estimation equation analysis (GEE) was applied to determine the predictors of MBL. Level of significance was kept at ≤ 0.05.
There were 104 implant restorations belonging to 41 patients. Screw retained prosthesis showed significantly greater MBL than cement retained prosthesis (-value =0 .018) (irrespective of crowns or fixed partial dentures). Other factors that turned out to be significant predictors of MBL were male gender (-value= <0.01), age >65 yrs. (-value=0.028) and sites where bone grafting was performed (-value=0.003).
Male patients of age >65 yrs. with sites needing bone grafts who were provided with screw retained prosthesis (irrespective of crown or fixed partial dentures) had significantly greater marginal bone loss around implants. Dental implants, dental prosthesis, implant supported dental prosthesis, alveolar bone loss.
种植体支持的固定修复体被视为缺失牙替代的标准治疗方法。这些修复体可以是螺丝固位或粘结固位的。种植修复体的成功或失败取决于边缘骨丢失（MBL）的量。本研究旨在确定粘结和螺丝固位种植修复体周围的MBL，并确定MBL的各种预测因素。
2017年2月至2017年6月在卡拉奇阿迦汗大学医院牙科诊所进行了一项回顾性病历审查，其中使用根尖片评估了104例种植修复体。在基线和12个月时计算MBL，并将差异记录在表格上。使用SPSS 21.0版进行统计分析。计算描述性统计量。应用广义估计方程分析（GEE）来确定MBL的预测因素。显著性水平保持在≤0.05。
有104例种植修复体属于41名患者。螺丝固位修复体显示出比粘结固位修复体显著更大的MBL（P值=0.018）（无论冠或固定局部义齿）。其他被证明是MBL显著预测因素的因素是男性（P值<0.01）、年龄>65岁（P值=0.028）和进行骨移植的部位（P值=0.003）。
年龄>65岁、需要骨移植部位且接受螺丝固位修复体（无论冠或固定局部义齿）的男性患者，种植体周围的边缘骨丢失显著更大。牙种植体、牙修复体、种植体支持的牙修复体、牙槽骨丢失。
