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Updated: May 2, 2026
An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
Evaluation of castable and premachined metal base abutment/implant interfaces before and after cyclical load
Renato De Mori1, Cyntia Ferreira Ribeiro, Laís Regiane da Silva-Concílio
1*Professor, Department of Prosthesis, São Leopoldo Mandic College, Vitória, Brazil. †Graduate Student, Department of Prosthodontics, University of Taubate, São Paulo, Brazil. ‡Associate Professor, Department of Prosthodontics, University of Taubate, São Paulo, Brazil.
Purpose:
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.
Materials And Methods:
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).
Results:
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.
Conclusion:
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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