Abstract
The purpose of this study was to compare the vertical fit of the castable abutment/implant and premachined base metal abutment/implant interface, before and after cyclic loading. Ten UCLA abutments were distributed in 2 groups: castable and premachined with a cobalt-chromium metal base. The abutments were cast in cobalt-chromium alloy and were screwed onto implants (3.75 × 13 mm, external hexagon) with a 32 N·cm torque. The vertical gap (in micrometers) at the interface abutment/implant was evaluated by linear microscope 2 times: after torque and after cyclic load (1 million cycles, 400 N). The mean values of the vertical gap at the castable abutment/implant and premachined abutment/implant interfaces before and after cyclic load were 5.33 to 6.64 µm and 7.36 to 8.16 µm, respectively. The mean values of the vertical gap were statistically analyzed (ANOVA and t test, P ≤ 0.05). Vertical gap values of the castable abutment/implant interface were not significantly different from those of the premachined abutment/implant interface, before (P = 0.154) and after (P = 0.471) cyclical loading. Castable and premachined base metal abutments showed similar gaps at the implant/abutment interface, both after applying torque and after cyclic loading.
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