The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
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THREE-DIMENTIONAL FINITE ELEMENT ANALYSIS OF STRESS DISTRIBUTION FOR DIFFERENT IMPLANT THREAD SLOPE

임플랜트 나사선 경사각이 치조골 응력 분포에 미치는 영향

  • Seo, Young-Hun (Department of Prosthodontics, College of Dentistry, Chonnam University) ;
  • Vang, Mong-Sook (Department of Prosthodontics, College of Dentistry, Chonnam University) ;
  • Yang, Hong-So (Department of Prosthodontics, College of Dentistry, Chonnam University) ;
  • Park, Sang-Won (Department of Prosthodontics, College of Dentistry, Chonnam University) ;
  • Park, Ha-Ok (Department of Prosthodontics, College of Dentistry, Chonnam University) ;
  • Lim, Hyun-Pil (Department of Prosthodontics, College of Dentistry, Chonnam University)
  • 서영훈 (전남대학교 치의학전문대학원 치과보철학교실) ;
  • 방몽숙 (전남대학교 치의학전문대학원 치과보철학교실) ;
  • 양홍서 (전남대학교 치의학전문대학원 치과보철학교실) ;
  • 박상원 (전남대학교 치의학전문대학원 치과보철학교실) ;
  • 박하옥 (전남대학교 치의학전문대학원 치과보철학교실) ;
  • 임현필 (전남대학교 치의학전문대학원 치과보철학교실)
  • Published : 2007.08.31
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Abstract

Statement of problem: The screws of dental implant, having various thread types, can be categorized into different classes by their geometrical form, and each type transmits dissimilar amount and form of stress to alveolar bone. Purpose: The purpose of this study was to find an inclination angle of the screw thread that is favorable in distributing the stresses to alveolar bone. Material and methods: In this study, We used three dimensional finite element analysis with modeling having three types of thread inclination angles and fixed pitch-0.8 mm (single thread type with $3.8^{\circ}$ inclination, double thread type with $7.7^{\circ}$ inclination, triple thread type with $11.5^{\circ}$ inclination). Results: The results obtained from this study were as follows; 1. When the number of thread increased, the amount of Von-Mises stress was reduced since the generated stress was effectively distributed. 2. 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 double thread had least amount of stress. This shows that the double thread screw gave best result. Conclusion: In conclusion, double, and triple thread screws were found to be more effective on distribution of the stress than the single thread screws. But, increasing in the thread inclination angle such as triple thread screw relate on the magnitude of the maximum principal stress affecting on the alveolar bone can become problematic. Thus, effective combination of thread number and thread inclination angle can help prolonging the longevity of implant.

Keywords

References

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