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KMID : 0362420130510010001
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Journal of Korean Academy of Prosthodontics
2013 Volume.51 No. 1 p.1 ~ p.10
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Three-dimensional finite element analysis of stress distribution for different implant thread slope and implant angulation
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Seo Young-Hun
Lim Hyun-Pil
Yun Kwi-Dug
Yoon Suk-Ja
Vang Mong-Sook
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Abstract
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PURPOSE: The purpose of this study was to find an inclination slope of the screw thread that is favorable in distributing the stresses to alveolar bone by using three dimensional finite element analysis.
MATERIALS AND METHODS: Three types modelling changed implant thread with fixed pitch of 0.8 mm is the single thread implant with 3.8 degree inclination, double thread implant with 7.7degree inclination and the triple thread implant with 11.5degree inclination. And three types implant angulation is the 0 degree, 10 degree and 15 degree on alveolar bone. The 9 modelling fabricated for three dimensional finite element analysis that restored prosthesis crown. The crown center applied on 200 N vertical load and 15degree tilting load.
RESULTS: 1. The more tilting of implant angulation, the more Von-Mises stress and Max principal stress is increasing. 2. Von-Mises stress and Max principal stress is increasing when applied 15 degree tilting load than vertical load on the bone. 3. When the number of thread increased, the amount of Von-Mises stress, Max principal stress was reduced since the generated stress was effectively distributed. 4. Since the maximum principal stress affects on the alveolar bone can influence deeply on the longevity of the implants. When comparing the magnitude of the maximum principal stress, the triple thread implant had a least amount of stress. This shows that the triple thread implant gave a best result.
CONCLUSION: A triple thread implant to increase in the thread slope inclination and number of thread is more effective on the distribution of stress than the single and double thread implants especially, implant angulation is more tilting than 10 degree on alveolar bone. Thus, effective combination of thread number and thread slope inclination can help prolonging the longevity of implant.
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KEYWORD
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Implant thread angulation, Implant installation angulation, Three-dimensional finite element analysis, Stress distribution
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