Finite Element Analysis of Stress Distribution around the Micro-Patterned Implants

마이크로패터닝을 부여한 임플란트 주변골에서의 하중 분포에 관한 유한요소분석법적 연구

  • Hur, Bae-Young (Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Kangnung National University) ;
  • Kim, Dae-Gon (Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Kangnung National University) ;
  • Park, Chan-Jin (Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Kangnung National University) ;
  • Cho, Lee-Ra (Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Kangnung National University)
  • 허배녕 (강릉대학교 치과대학 치과보철학교실 및 구강과학연구소) ;
  • 김대곤 (강릉대학교 치과대학 치과보철학교실 및 구강과학연구소) ;
  • 박찬진 (강릉대학교 치과대학 치과보철학교실 및 구강과학연구소) ;
  • 조리라 (강릉대학교 치과대학 치과보철학교실 및 구강과학연구소)
  • Received : 2007.12.23
  • Accepted : 2008.03.25
  • Published : 2008.03.30


Implant requires long lasting, strong osseointegration using bio-mechanical interlocking by bone ingrowth. In regarding the size level for bone ingrowth, the micro-patterning would enhance bone response. Micro-patterning can increase the area contacting the bone tissues. Therefore, it may distribute the load to the surrounding bone tissue, more effectively. This study compared and analyzed the load distributing effect with the shape and number of micro-patterning. For the optimal comparison of threads, the assumptions different from general finite element analysis model were made. It was assumed that the implant was axisymmetric and infinitely long. The implant was assumed to be completely embedded in the infinitely long cortical bone and to have 100% bone apposition. The implant-bone interface had completely fixed boundary conditions and received an infinitely big axial load. The condition of threads were as follows. The reference model 1 had conventional thread. Model 2 had 2 micro-patterns on the upper flank of the thread. Model 3 had 2 micro-patterns on the lower flank of the thread. Model 4 had 2 micro-patterns on the upper and lower flanks of the thread. Model 5 had 3 micro patterns on the upper and lower flanks of the thread. The results were as follows: 1. The thread with micro-patterns distributed stress better than the conventional thread. 2. The thread with micro-patterns on the lower flank distributed stress better than that with micro-patterns on the upper flank. 3. The thread with 3 micro-patterns distributed stress better than that with 2 micro-patterns, However, an area with stress concentration occurred.

골조직이 자라 들어갈 수 있는 적절한 크기의 마이크로패터닝을 부여하면 강하고 지속적인 골유착을 이룰 수 있는 생역학적 결합을 이룰 수 있다. 또한 마이크로패터닝을 통해 골조직과 접촉하는 면적을 증가시킴으로써 하중을 적절히 분산시킬 수도 있다. 본 연구에서는 마이크로패터닝의 형태와 크기에 따른 응력의 분산에 대해 연구하였다. 나사 하나에서의 하중을 연구하기 위해 2차원 유한요소분석법을 이용하였다. 임플란트는 무한히 긴 피질골에 100% 접촉하며 골-임플란트 계면은 고정된 것으로 경계조건을 설정한 후 마이크로패터닝의 위치와 수에 따라 5군으로 나누어 축력을 가한 후 최대응력과 응력의 분산양상을 비교하였다. 연구 결과, 마이크로패터닝을 부여하면 일반적인 나사에 비해 응력을 보다 넓게 분산시켰으며 나사의 하방에 마이크로패터닝을 부여한 것이 상방에 부여한 것보다 더 고르게 응력을 분산시켰다. 3개의 마이크로패터닝을 부여한 군이 2개의 마이크로패터닝을 부여한 군에 비해 응력을 넓게 분산시켰으나 응력이 집중되는 부위가 나타났다. 이상의 결과를 통해 마이크로패터닝을 부여하면 응력의 분산효과가 있으며 특히 나사 하방에 부여하는 것이 더 큰 효과를 냄을 알 수 있었다.


Supported by : 강릉대학교 치과병원


  1. Branemark PI. Osseointegration and its experimental background. J Prosthet Dent. 1983;50:399-410
  2. Albrektsson T. Hydroxyapatite-coated implants: a case against their use. J Oral Maxillofac Surg. 1998;56: 1312-26
  3. Hallgren C, Reimers H, Chakarov D, Gold J, Wennerberg A. An in vivo study of bone response to implants topographically modified by laser micromachining. Biomaterials. 2003;24:701-10
  4. Hallgren C, Reimers H, Gold J, Wennerberg A. The importance of surface texture for bone integration of screw shaped implants: an in vivo study of implants patterned by photolithography. J Biomed Mater Res. 2001;57:485-96<485::AID-JBM1194>3.0.CO;2-1
  5. Chehroudi B, Gould TR, Brunette DM. Effects of a grooved titanium-coated implant surface on epithelial cell behavior in vitro and in vivo. J Biomed Mater Res. 1989;23:1067-85
  6. Brunette DM, Chehroudi B. The effects of the surface topography of micromachined titanium substrata on cell behavior in vitro and in vivo. J Biomech Eng. 1999;121:49-57
  7. Hulbert SF, Young FA, Mathews RS, Klawitter JJ, Talbert CD, Stelling FH. Potential of ceramic materials as permanently implantable skeletal prostheses. J Biomed Mater Res. 1970;4:433-56
  8. Bobyn JD, Pilliar RM, Cameron HU, Weatherly GC. The optimum pore size for the fixation of porous-surfaced metal implants by the ingrowth of bone. Clin Orthop Relat Res. 1980;150:263-70
  9. Itala AI, Ylanen HO, Ekholm C, Karlsson KH, Aro HT. Pore diameter of more than 100 microm is not requisite for bone ingrowth in rabbits. J Biomed Mater Res. 2001;58:679-83
  10. Geng JP, Ma QS, Xu W, Tan KB, Liu GR. Finite element analysis of four thread-form configurations in a stepped screw implant. J Oral Rehabil. 2004;3:233-9
  11. Chun HJ, Cheong SY, Han JH, Heo SJ, Chung JP, Rhyu IC, Choi YC, Baik HK, Ku Y, Kim MH. Evaluation of design parameters of osseointegrated dental implants using finite element analysis. J Oral Rehabil. 2002;29:565-74
  12. Hansson S. The implant neck: smooth or provided with retention elements. A biomechanical approach. Clin Oral Implants Res. 1999;10:394-405
  13. Hansson S, Werke M. The implant thread as a retention element in cortical bone: the effect of thread size and thread profile: a finite element study. J Biomech. 2003;36:1247-58
  14. Hansson S, Ekestubbe A. Area moments of inertia as a measure of the mandible stiffness of the implant patient. Clin Oral Implants Res. 2004;15:450-8
  15. Siegele D, Soltesz U. Numerical investigations of the influence of implant shape on stress distribution in the jaw bone. Int J Oral Maxillofac Implants. 1989;4:333-40
  16. Sato Y, Teixeira ER, Tsuga K, Shindoi N. The effectiveness of a new algorithm on a three- dimensional finite element model construction of bone trabeculae in implant biomechanics. J Oral Rehabil. 1999;26:640-3
  17. Tada S, Stegaroiu R, Kitamura E, Miyakawa O, Kusakari H. Influence of implant design and bone quality on stress/strain distribution in bone around implants: a 3-dimensional finite element analysis. Int J Oral Maxillofac Implants. 2003;18:357-68
  18. Vaillancourt H, Pilliar RM, McCammond D. Factors affecting crestal bone loss with dental implants partially covered with a porous coating: a finite element analysis.Int J Oral Maxillofac Implants. 1996;11:351-9
  19. Pilliar RM, Deporter DA, Watson PA, Valiquette N. Dental implant design--effect on bone remodeling. J Biomed Mater Res. 1991;25:467-83
  20. Steigenga JT, al-Shammari KF, Nociti FH, Misch CE, Wang HL. Dental implant design and its relationship to long-term implant success. Implant Dent. 2003;12:306-17
  21. Brunski JB. Biomechanical considerations in dental implant design. Int J Oral Implantol. 1988;5:31-4
  22. Kitamura E, Stegaroiu R, Nomura S, Miyakawa O. Biomechanical aspects of marginal bone resorption around osseointegrated implants: considerations based on a three-dimensional finite element analysis. Clin Oral Implants Res. 2004;15:401-12
  23. Alkan I, Sertgoz A, Ekici B. Influence of occlusal forces on stress distribution in preloaded dental implant screws. J Prosthet Dent. 2004;91:319-25
  24. Rieger MR, Fareed K, Adams WK, Tanquist RA. Bone stress distribution for three endosseous implants. J Prosthet Dent. 1989;61:223-8
  25. Rieger MR, Adams WK, Kinzel GL, Brose MO. Finite element analysis of bone-adapted and bone-bonded endosseous implants. J Prosthet Dent. 1989;62:436-40
  26. Rieger MR, Adams WK, Kinzel GL. A finite element survey of eleven endosseous implants. J Prosthet Dent. 1990;63:457-65
  27. Rieger MR, Mayberry M, Brose MO. Finite element analysis of six endosseous implants. J Prosthet Dent. 1990;63:671-6
  28. Bozkaya D, Muftu S, Muftu A.Evaluation of load transfer characteristics of five different implants in compact bone at different load levels by finite elements analysis. J Prosthet Dent. 2004;92:523-30
  29. Eskitascioglu G, Usumez A, Sevimay M, Soykan E, Unsal E. The influence of occlusal loading location on stresses transferred to implant-supported prostheses and supporting bone: A three-dimensional finite element study. J Prosthet Dent. 2004;91:144-50
  30. Sevimay M, Turhan F, Kilicarslan MA, Eskitascioglu G. Three-dimensional finite element analysis of the effect of different bone quality on stress distribution in an implant-supported crown. J Prosthet Dent. 2005;93:227-34
  31. Patra AK, DePaolo JM, D'Souza KS, DeTolla D, Meenaghan MA. Guidelines for analysis and redesign of dental implants. Implant Dent. 1998;7:355-68