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KMID : 0362420140520040279
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Journal of Korean Academy of Prosthodontics
2014 Volume.52 No. 4 p.279 ~ p.286
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Effects of implant thread profile on insertion stress generation in cortical bone studied by dynamic finite element simulation
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Yu Won-Jae
Ha Seok-Joon
Cho Jin-Hyun
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Abstract
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PURPOSE. The aim of this study was to investigate the effect of implant thread profile on the marginal bone stresses which develop during implant insertion.
MATERIALS AND METHODS. Four experimental implants were created by placing four different thread systems on the body (4.1 mm × 10 mm) of the ITI standard implant. The thread types studied in this study included the buttress, v-shape, reverse buttress, and square shape threads. In order to examine the insertion stress generation, 3D dynamic finite element analysis was performed which simulated the insertion process of implants into a 1.2 mm thick cortical bone plate (containing 3.5 mm pilot hole) using a PC-based DEFORM 3D (ver 6.1, SFTC, Columbus, OH, USA) program.
RESULTS. Insertion stresses higher than human cortical bone developed around the implants. The level of insertion stresses was much different depending on the thread. Stress level was lowest near the v-shape thread, and highest near the square shaped thread. Difference in the interfacial bone stress level was more noticeable near the valley than the tip of the threads.
CONCLUSION. Among the four threads, the v-shape thread was turned out to minimize the insertion stress level and thereby create better conditions for implant osseointegration.
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KEYWORD
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Dynamic finite element simulation, Implant thread profile
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