Faculty of Dentistry, The University of Hong Kong, Hong Kong, China.
Faculty of Odontology, Malmo University, Malmo, Sweden.
Clin Oral Implants Res. 2017 Dec;28(12):1523-1531. doi: 10.1111/clr.13021. Epub 2017 Apr 11.
The aim of this study was to investigate the micromorphological differences among three commercially available titanium abutments on Straumann implants. Furthermore, the possible impact of functional loading on the micromorphology and potential complications was investigated with the use of in vitro testing.
Three groups of Titanium abutments (A: Straumann Variobase n = 5, B: EBI best Duo n = 5, and C: Implant Direct n = 5) were torqued on Straumann RN implants, as according to each of the manufacturer's instructions. The implant-abutment units were scanned with Micro-CT. Three units of each group were directly sliced in the microtome and photographed under different magnifications (10×-500×) through a Scanning Electron Microscope. Six units (two from each group) were restored with cement-retained crowns, subjected to 2000,000 load cycles with loads between 30 and 300 N at 2 Hz, examined through Micro-CT and finally sliced and photographed as described above. The micromorphology of each unit was studied, and the total length of tight contact (<3 μm) was calculated between the implant, abutment and screw contact areas.
Major morphological differences were identified between the three units, as well as differences in the extent of tight contact in all areas examined. Despite the morphological differences, the 2M cycles of loading via in vitro test did not result in any noticeable complications although some changes in the micromorphology were observed.
The examined implant-abutment units presented with major morphological differences. Two million cycles of in vitro loading did not appear to affect the stability of the units despite the micromorphological changes. These results need to be interpreted however under the limitations of the small sample size and the specific set-up of the in vitro testing.
本研究旨在研究三种市售钛基台在 Straumann 种植体上的微观形貌差异。此外，还通过体外试验研究了功能负载对微观形貌和潜在并发症的可能影响。
将三组钛基台（A：Straumann Variobase n=5，B：EBI best Duo n=5，C：Implant Direct n=5）按照各制造商的说明拧紧在 Straumann RN 种植体上。用 Micro-CT 扫描种植体-基台单元。每组的三个单元在微切片机中直接切片，并通过扫描电子显微镜在不同放大倍数（10×-500×）下拍照。每组的六个单元（每组两个）用粘结固位冠修复，在 2Hz 下用 30-300N 的载荷进行 200 万次循环加载，用 Micro-CT 检查，最后按照上述方法切片拍照。研究每个单元的微观形态，并计算种植体、基台和螺丝接触区域之间的紧密接触总长度（<3μm）。
三个单元之间存在明显的形态差异，所有检查区域的紧密接触程度也存在差异。尽管存在形态差异，但通过体外试验进行的 2M 循环加载并未导致任何明显的并发症，尽管观察到一些微观形态的变化。
所检查的种植体-基台单元存在明显的形态差异。尽管微观形态发生了变化，但体外 200 万次加载循环似乎并未影响单元的稳定性。然而，这些结果需要在小样本量和特定体外试验设置的限制下进行解释。
