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KMID : 0988720090250040349
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Journal of the Korean Academy of Stomatognathic Function and occlusion
2009 Volume.25 No. 4 p.349 ~ p.360
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Shin Sung-Ae
Kim Chang-Seop
Cho Wook
Jeon Yun-Kyung
Jeon You-Jin
Yoon Ji-Hoon
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Abstract
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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.
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KEYWORD
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compressive bending force, endurance limit, mechanical strength, zirconia abutment
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