While half of the specimens from each ceramic-metal combination were randomly tested without aging ( water storage at 37 degrees C for 24 h only ) , the other half were first thermocycled ( 6000 cycles , between 5 and 55 degrees C , dwell time : 13 s ) and then mechanically loaded ( 20,000 cycles under 50 N load , immersion in distilled water at 37 degrees C ) .
