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Surface Changes between Implant and Zircoina Abutment after Loading  

Kim, Moon-Soo (Department of prosthodontics, college of Dentistry, Chosun University)
Cho, Young-Bum (Department of prosthodontics, college of Dentistry, Chosun University)
Kim, Hee-Jung (Department of prosthodontics, college of Dentistry, Chosun University)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.27, no.2, 2011 , pp. 185-195 More about this Journal
Abstract
In this study, titanium abutments and zirconia abutments were connected to each implant in external type implants. After that they were loaded 10000 times with 20Kg as occlusal force. The surface changes of external hexgon part and platform were observed in FESEM image. Viker's hardness of an implant, a titanium abutment and a zirconia abutment were measured respectively. 1. Viker's hardness of an implants, a titanium abutment and a zirconia abutment was $309.80{\pm}11.78$ HV, $318.40{\pm}11.82$ HV, and $1495.30{\pm}16.21$ HV respectively. There was no statistical significance between an implant and a titanium abutment (P>0.05, Anova). However, there was statistical significance between an implant and a zirconia abutment(P<0.05, Anova). 2. The wear was observed at the joint of implant and abutment in both a titanium abutment group and a zirconia abutment group after loading 10,000 times. The zirconia abutment showed more remarkable wear than the titanium one. In conclusion, the wear of external hexagon and platform was much more notable in a zirconia abutment group than a titanium one. It was suggested that it could result from the difference of surface hardness between titanium and zirconia. The wear of junction between an implant and a zirconia abutment becomes more severe, the connection of an implant and an abutment is much more unfit. This is likely to cause loosening and fracture of the abutment screw. so it is considered that the possibility of implant supra-structure failure can be increased.
Keywords
Zirconia abutment; Viker's hardness; surface changes;
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Times Cited By KSCI : 1  (Citation Analysis)
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