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KMID : 1004520100260020121
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Journal of Dental Rehabilitation and Applied Science
2010 Volume.26 No. 2 p.121 ~ p.143
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Effect of Implant Types and Bone Resorption on the Fatigue Life and Fracture Characteristics of Dental Implants
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Won Ho-Yeon
Choi Yu-Sung
Cho In-Ho
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Abstract
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To investigate the effect of implant types and bone resorption on the fracture characteristics. 4 types of OsstemⓡImplant were chosen and classified into external parallel, internal parallel, external taper, internal taper groups. Finite elements analysis was conducted with ANSYS Multi Physics software. Fatigue fracture test was performed by connecting the mold to the dynamic load fatigue testing machine with maximum load of 600N and minimum load of 60N. The entire fatigue test was performed with frequency of 14Hz and fractured specimens were observed with Hitachi S-3000 H scanning electron microscope. The results were as follows: 1. In the fatigue test of 2 ㎜ exposed implants group, Tapered type and external connected type had higher fatigue life. 2. In the fatigue test of 4 ㎜ exposed implants group, Parallel type and external connected types had higher fatigue life. 3. The fracture patterns of all 4 ㎜ exposed implant system appeared transversely near the dead space of the fixture. With a exposing level of 2 ㎜, all internally connected implant systems were fractured transversely at the platform of fixture facing the abutment. but externally connected ones were fractured at the fillet of abutment body and hexa of fixture or near the dead space of the fixture. 4. Many fatigue striations were observed near the crack initiation and propagation sites. The cleavage with facet or dimple fractures appeared at the final fracture sites.
5. Effective stress of buccal site with compressive stress is higher than that of lingual site with tensile stress, and effective
stress acting on the fixture is higher than that of the abutment screw. Also, maximum effective stress acting on the
parallel type fixtures is higher. It is careful to use the internal type implant system in posterior area.
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KEYWORD
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Bone resorption, Fatigue fracture, Implant type
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