Abstract
The shear strength of the cement-metal interface using rods with different surface treatments and a clinical standardized cementing technique was studied. Under “dry” conditions, a low interface shear strength can be obtained with polished and smooth CoCrMo surfaces (peak-to-valley height R t : 1 μm, average 0.2 MPa; 5 μm, 0.38 MPa). Grit-blasted and polymethylmethacrylate (PMMA)-precoated surfaces achieved higher values (PMMA precoat: average 5.16 MPa; CoCrMo peak-to-valley height R t : 20 μm, average 8.61 MPa; 60 μm, average 7.8 MPa). After immersion in physiological saline solution for 60 days, the PMMA-precoated rods kept their initial stability whereas all the other test rods had lost their stability completely. A microscopic analysis of cross-sections revealed gap formations at the cement-metal interface to varying degrees (1–16 μm). PMMA-precoated rods rarely showed any gap formation at all. The above-mentioned gap formation was seen independently of the porosity at the cement-metal interface and corresponds to the clinical and postmortem observed debonding of the interface.
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Received: 23 December 1996
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Müller, R., Schürmann, N. Shear strength of the cement metal interface – an experimental study. Arch Orth Traum Surg 119, 133–138 (1999). https://doi.org/10.1007/s004020050376
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DOI: https://doi.org/10.1007/s004020050376