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Mechanical strength of Zirconia Abutment in Implant Restoration  

Shin, Sung-ae (Department of Prosthodontics, Collage of Dentistry, Pusan National University)
Kim, Chang-Seop (Department of Prosthodontics, Collage of Dentistry, Pusan National University)
Cho, Wook (Department of Prosthodontics, Collage of Dentistry, Pusan National University)
Jeong, Chang-Mo (Department of Prosthodontics, Collage of Dentistry, Pusan National University)
Jeon, Young-Chan (Department of Prosthodontics, Collage of Dentistry, Pusan National University)
Yun, Ji-Hoon (Osstem Implant Research Center)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.25, no.4, 2009 , pp. 349-360 More about this Journal
Abstract
Purpose: As the esthetic demands of dental implant patients are increased, the demands of zirconia as implant abutment material are also increased. It has non-metalic color, good biocompatibility, high strength and high toughness. Even thought the advatage of zirconia abutment, there are a few studies about mechanical properties of zirconia abutment. This study evaluated the mecanical strength with compressive bending strength and endurance limit of implant-zirconia abutment assembly. Materials and Methods: Static and cyclic loading of implant-Zirconia abutment assembly were simulated under worst case condition according to ISO. Test groups were implants of external butt joint with straight regular diameter and angled regular diameter zirconia abutment, implant of external butt joint with narrow straight diameter zirconia abutment and implant of internal conical joint with straight narrow diameter zirconia abutment. All test group were evaluated the mecanical strength with compressive bending strength and endurance limit. After fatique testing, fracture surface were examined by SEM. Results: The compressive bending strengths exceed 927N. Regular diameter zirconia abutment were stronger than narrow diameter zirconia abutment(P<.05). The endurance limits ranged from 503N to 868N. Conclusion: Within the limitation of this study, zirconia implant abutment exceeded the estabilished values for maximum incisal biting forces reported in the literature.
Keywords
compressive bending force; endurance limit; mechanical strength; zirconia abutment;
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