Department of Oral Implatology, Faculty of Dentistry, Istanbul University, Istanbul, Turkey.
Int J Oral Maxillofac Implants. 2013 May-Jun;28(3):815-23. doi: 10.11607/jomi.3087.
The aim of this prospective clinical trial was to compare the three-dimensional marginal bone level, implant stability, and peri-implant health of two types of submerged dental implants that were restored with matching or platform-switched abutments.
Twenty-five subjects were recruited (test group: 43 implants with internal conical connection and back-tapered collar carrying a platform-switched abutment; control group: 50 implants carrying a matched-platform abutment). Implant uncovering and conventional loading were performed after 3 months of healing, and the total observation time was 15 months. Marginal bone levels, resonance frequency analysis, insertion torque, and peri-implant health indices were recorded and analyzed statistically.
The cumulative implant survival rate was 100%. At the second-stage surgery, bone levels were similar between groups. One year after loading, mean crestal bone loss was 0.35 ± 0.13 mm for test implants and 0.83 ± 0.16 mm for control implants, a significant difference. Primary stability was significantly higher in the test group than in the control group, but this difference disappeared after 3 months of healing prior to loading. Between-group differences for peri-implant health indices were negligible.
Both implant systems had the same survival rates. Implants with a built-in platform switch and conical connection with back-tapered collar design achieved higher primary stability at insertion and less bone resorption after 15 months.
本前瞻性临床试验旨在比较两种类型的潜入式牙种植体的三维边缘骨水平、种植体稳定性和种植体周围健康状况，这两种种植体分别使用匹配或平台转换基台进行修复。
共招募了 25 名受试者（试验组：43 个具有内部锥形连接和后锥形颈的种植体，带有平台转换基台；对照组：50 个带有匹配平台基台的种植体）。愈合 3 个月后进行种植体暴露和常规加载，总观察时间为 15 个月。记录和分析边缘骨水平、共振频率分析、插入扭矩和种植体周围健康指数。
累积种植体存活率为 100%。在二期手术中，两组的骨水平相似。加载 1 年后，试验组种植体的平均颊侧骨吸收量为 0.35±0.13mm，对照组为 0.83±0.16mm，差异显著。试验组种植体的初始稳定性明显高于对照组，但在加载前愈合 3 个月后，这种差异消失。种植体周围健康指数的组间差异可以忽略不计。
两种种植体系统的存活率相同。具有内置平台转换和后锥形颈设计的锥形连接种植体在植入时具有更高的初始稳定性，在 15 个月后吸收的骨质更少。
