After earlier experiments showed that bone became adherent to glass ceramic, the maximum mechanical stress on the bone-ceramic interface, as compared with polymethylmethacrylate (PMMA) and aluminium oxide ceramic, was investigated for shearing force and tension. Whereas the PMMA and aluminium oxide ceramic test objects which had been inclosed in the connective tissue were very easily pushed out without measurable pressure, the average fracture load for 15 smooth glass ceramic objects was 466 p/mm2 in the pushed out test and 167 p/mm2 in the tension test.
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