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Evaluation of stability of interface between CCM (Co-Cr-Mo) UCLA abutment and external hex implant

 Ki-Joon Yoon  ;  Young-Bum Park  ;  Hyunmin Choi  ;  Youngsung Cho  ;  Jae-Hoon Lee  ;  Keun-Woo Lee 
 Journal of Advanced Prosthodontics, Vol.8(6) : 465-471, 2016 
Journal Title
 Journal of Advanced Prosthodontics 
Issue Date
CCM UCLA abutment ; Chewing simulator ; External hex implant ; Removal torque value
PURPOSE: The purpose of this study is to evaluate the stability of interface between Co-Cr-Mo (CCM) UCLA abutment and external hex implant. MATERIALS AND METHODS: Sixteen external hex implant fixtures were assigned to two groups (CCM and Gold group) and were embedded in molds using clear acrylic resin. Screw-retained prostheses were constructed using CCM UCLA abutment and Gold UCLA abutment. The external implant fixture and screw-retained prostheses were connected using abutment screws. After the abutments were tightened to 30 Ncm torque, 5 kg thermocyclic functional loading was applied by chewing simulator. A target of 1.0 × 106 cycles was applied. After cyclic loading, removal torque values were recorded using a driving torque tester, and the interface between implant fixture and abutment was evaluated by scanning electronic microscope (SEM). The means and standard deviations (SD) between the CCM and Gold groups were analyzed with independent t-test at the significance level of 0.05. RESULTS: Fractures of crowns, abutments, abutment screws, and fixtures and loosening of abutment screws were not observed after thermocyclic loading. There were no statistically significant differences at the recorded removal torque values between CCM and Gold groups (P>.05). SEM analysis revealed that remarkable wear patterns were observed at the abutment interface only for Gold UCLA abutments. Those patterns were not observed for other specimens. CONCLUSION: Within the limit of this study, CCM UCLA abutment has no statistically significant difference in the stability of interface with external hex implant, compared with Gold UCLA abutment.
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2. College of Dentistry (치과대학) > Dept. of Prosthodontics (보철과학교실) > 1. Journal Papers
Yonsei Authors
Park, Young Bum(박영범)
Lee, Keun Woo(이근우) ORCID logo https://orcid.org/0000-0002-3153-190X
Lee, Jae Hoon(이재훈) ORCID logo https://orcid.org/0000-0003-2281-8885
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