Friberg B, Sennerby L, Linden B, Gröndahl K, Lekholm U
Brånemark Clinic, Department of Handicap Research, Faculty of Medicine, Göteborg University, Sweden.
Int J Oral Maxillofac Surg. 1999 Aug;28(4):266-72.
Using a one-stage surgical protocol, 75 implants ad modum Brånemark of three different designs were inserted in 15 edentulous mandibles of high bone density. All implants were followed with repeated stability measurements by means of resonance frequency analysis (RFA) from implant placement to connection of the fixed prostheses (3-4 months), in order to evaluate possible stability changes during healing. It was shown that the resonance frequency (RF) values slightly decreased for the majority of the implants during the study period independent of design. Consequently, the results of the present study indicated that the implants were as stable at time of placement as when measured at 3-4 months post-surgery, i.e. when the prostheses were attached. The available data support the concept of direct loading of implants when inserted between the mental interforaminal regions. One implant failed during healing and the corresponding RF measurement disclosed, at six weeks post-surgery, a value being far below the one registered at implant placement. The lowered RF value indicated the failure several weeks before the mobility was clinically diagnosed. The presence or absence of a fixture/abutment junction did not exert any influence on the marginal bone level, as determined radiographically at the end of the short investigation period.
采用单阶段手术方案，将75枚三种不同设计的Brånemark式种植体植入15例高骨密度的无牙下颌骨。从种植体植入到固定修复体连接（3 - 4个月）期间，通过共振频率分析（RFA）对所有种植体进行反复稳定性测量，以评估愈合过程中可能的稳定性变化。结果显示，在研究期间，大多数种植体的共振频率（RF）值略有下降，与设计无关。因此，本研究结果表明，种植体在植入时与术后3 - 4个月（即修复体连接时）测量时的稳定性相同。现有数据支持在颏孔间区域植入种植体时直接加载的概念。一枚种植体在愈合过程中失败，术后六周的相应RF测量显示，其值远低于植入时记录的值。RF值降低表明在临床诊断出松动前数周就已出现失败。在短研究期结束时通过影像学确定，种植体/基台连接处的存在与否对边缘骨水平没有任何影响。
