A comparative study of gold UCLA-type and CAD/CAM titanium implant abutments

Ji Man Park, Jai Bong Lee, Seong Joo Heo, Eun Jin Park

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Purpose: The aim of this study was to evaluate the interface accuracy of computer-assisted designed and manufactured (CAD/CAM) titanium abutments and implant fixture compared to gold-cast UCLA abutments. Materials and methods: An external connection implant system (Mark III, n=10) and an internal connection implant system (Replace Select, n=10) were used, 5 of each group were connected to milled titanium abutment and the rest were connected to the gold-cast UCLA abutments. The implant fixture and abutment were tightened to torque of 35 Ncm using a digital torque gauge, and initial detorque values were measured 10 minutes after tightening. To mimic the mastication, a cyclic loading was applied at 14 Hz for one million cycles, with the stress amplitude range being within 0 N to 100 N. After the cyclic loading, detorque values were measured again. The fixture-abutment gaps were measured under a microscope and recorded with an accuracy of ±0.1 μm at 50 points. Results: Initial detorque values of milled abutment were significantly higher than those of cast abutment (P<.05). Detorque values after one million dynamic cyclic loadings were not significantly different (P>.05). After cyclic loading, detorque values of cast abutment increased, but those of milled abutment decreased (P<.05). There was no significant difference of gap dimension between the milled abutment group and the cast abutment group after cyclic loading. Conclusion: In conclusion, CAD/CAM milled titanium abutment can be fabricated with sufficient accuracy to permit screw joint stability between abutment and fixture comparable to that of the traditional gold cast UCLA abutment.

Original languageEnglish
Pages (from-to)46-52
Number of pages7
JournalJournal of Advanced Prosthodontics
Issue number1
StatePublished - Feb 2014


  • CAD/CAM titanium abutments
  • Cyclic loading
  • Detorque value
  • Fixture-abutment gap
  • Gold-cast UCLA abutments


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