Comparison of amalgam behaviour under static and cyclic sub-modulus of rupture loading.

The behaviour of amalgam beam specimens subjected to a sub-modulus of rupture load at 37 degrees C was compared in static and cyclic modes. Testing was performed using identical equipment, with cyclic testing conducted by intermittent load application for both tests. The specimens tested exhibited varying degrees of deformation and times to fracture in both tests. The mode of load application, either cyclic or static, did not appear to have a significant effect on the degree of amalgam deformation or time to fracture. The most important factors relating to deformation are time of total load application, creep of the specific amalgam and temperature of testing.