Independent -tests were conducted based on the calculated mean and standard deviation of the removal torque for Gold and CCM UCLA abutments. SPSS version 18.0 for Windows (SPSS Inc., Chicago, IL, USA) was used for statistical analyses.Department of Prosthodontics, Oral Science Research Center, Yonsei University College of Dentistry, Seoul, Republic of Korea.
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At the interface of fixture in Gold and CCM group, it showed areas that had with abutment in the shape of concentric circle around the screw hole, but remarkable wear patterns were not observed. The CCM abutment has greater physical strength and hardness than implant fixture, so it was expected that it would show more remarkable wear patterns. However, from the result of SEM photographs, it appeared that there were no considerable mechanical damages (, ).Within the limit of this study, CCM UCLA abutment has
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