The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

FINITE ELEMENT ANALYSIS OF THE INFLUENCE OF ESTHETIC POSTS ON INCISORS

심미 포스트가 전치에 미치는 응력과 변위에 관한 삼차원 유한요소법적 분석

  • Kwon Tae-Hoon (Department of Prothodontics, Graduate School of Clinical Dentistry, Korea University) ;
  • Hwang Jung-Won (Department of Prothodontics, Graduate School of Clinical Dentistry, Korea University) ;
  • Kim Sung-Hun (Department of Prothodontics, Graduate School of Clinical Dentistry, Korea University) ;
  • Shin Sang-Wan (Department of Prothodontics, Graduate School of Clinical Dentistry, Korea University)
  • 권태훈 (고려대학교 임상치의학 대학원 악구강기능회복학과) ;
  • 황정원 (고려대학교 임상치의학 대학원 악구강기능회복학과) ;
  • 김성훈 (고려대학교 임상치의학 대학원 악구강기능회복학과) ;
  • 신상완 (고려대학교 임상치의학 대학원 악구강기능회복학과)
  • Published : 2003.10.01
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Abstract

Statement of problem : Most posts are metallic, but in response to the need for a post that possesses optical properties compatible with an all-ceramic crown. an esthetic post has been developed. Although there have been many studies about the esthetic post materials, 3-dimensional finite element studies about the stress distribution of them are in rare. Purpose : The purpose of this study is to investigate comparatively the distribution of stresses of the restored, endodontically treated maxillary incisors with the esthetic post materials and the displacement on the cement layer on simulated occlusal loading by using a 3-dimensional finite element analysis model. Material and method : Four 3-dimensional finite element models were constructed in a view of a maxillary central incisor, a post, a core, and the supporting tissues to investigate the stresses in various esthetic posts and cores and the displacement on the cement layer (Model 1 ; Cast gold post and core, Model 2 ; Glass fiber post with composite core, Model 3 ; Zirconia post with composite core. Model 4 ; Zirconia post with ceramic core). Force of 300N was applied to the incisal edge and the cingulum (centric stop point) with the angle of 135-degree to the long axis of the tooth. Results : 1. The stresses and displacement on the incisal edge were higher than on the cingulum 2. The stresses in dentin were the highest in Model 2 (Glass fiber post with composite core), and the second was Model 3, the third Model 1, and the lowest Model 4. 3. The stresses in post and core were the highest in Model 4 (Zirconia post with ceramic core), and the second was Model 1, the third Model 3, and the lowest Model 2. 4. The displacement on the cement layer was the highest in Model 2 (Glass fiber post with composite core), and the second was Model 3, the third Model 1, and the lowest Model 4. Conclusion : When a functional maximum bite force was applied, the distribution of stresses or the esthetic post and core materials and the displacement on the cement layer were a little different. It seems that restoring extensively damaged incisors with esthetic post and core materials would be decided according to the remaining tooth structure.

Keywords

References

  1. Morgano SM, Milot P : Clinical success of cast metal posts and cores. J Prosthet Dent 1993:70:11-6
  2. Shillingberg HT, Kessler JC : Restoration of the endodontically treated tooth. Chicago: Quintessence 1982:p.131
  3. Duret B. Reynaud M. Duret F : A new concept of corono-radicular econstruction : the Composipost(2). [in French] Chir Dent Fr 1990:60:69-77.
  4. King PA Setchell DJ : In vitro evaluation of a prototype CFRC prefabricated post developed for the restoration of pulpless teeth. J Oral Rehabil 1990:17:599-609
  5. Purton DG, Payne JA : Comparison carbon fiber and stainless steel root canal posts Quintessence Int 1996:27:93-7
  6. Torjorner A Karlsson S, Syverud M, Hensten-Pettersen A Carbon fiber reinforced root canal posts. Mechanical and cytotoxic properties. Eur J Oral Sci 1996:17:599-609
  7. Myenberg KH. Lutty H, Scharer P : Zirconia post: a new all-ceramic concept for nonvital abutment teeth. J Esthet Dent 1995:7:73-80
  8. Pissis P : Fabrication of a metal-free ceramic restoration utilizing the monobloc technique. Prac Periodontics Aesthet Dent 1995:7:83-94
  9. Zalkind M, Hochman N : Direct core buildup using a preformed crown and prefabricated zirconium oxide post. J Prosthet Dent 1998:80:730-2
  10. Gubta TK, Lange FF , Bechtold JH : Effect of stress-induced phase transformation on the metastable tetragonal phase. J Mat Sci 1978:13:1464-70
  11. Hulbert SF, Morrison SJ. Klawitter JJ : Tissue reaction to three ceramics of porous and non-porous structure. J Biomed Mater Res 1972:6:347-74
  12. Cales B. Stefani Y, Lilley E : Long-term in vivo and aging of a zirconia ceramic used in orthopaedy. J Biomed Mat 1994: 28:619-24
  13. Loney RW, Kotowicz WE, McDowell GC : Three dimensional photoelastic analysis of the ferrule effect in cast post and cores. J Prosthet Dent 1990:63:506
  14. Eissman HF, Radke RA : Post endodontic restoration. In: Cohen S. Bums RC, editors. Pathways of the pulp. 4th ed. St Louis: CV Mosby 1987:p. 640-3
  15. Lee SH. Choi SY. Stress distribution of endodontically treated tooth according to the post-three-dimensional finite element study. J Korean Acad Prosthodont 1996;34:780-790
  16. Waliszewski KJ. Sabala CL : Combined endodontic and restorative treatment con sideration. J Prosthet Dent 1978:40:152
  17. Ko CC. Chu CS. Chung KH, Lee MC : Effects of post on dentin stress distribution in pulpless teeth. J Prosthet Dent 1992:68:421
  18. Peters MCRB, Poort HW, Craig RG : Stress analysis of a tooth restored with a post and core. J Dent Res 1983;62:760
  19. Morgano SM, Hashem AF, Fotoohi K, Rose L : A nationwide survey of contemporary philosophies and techniques of restoring endodontically treated teeth. J Prosthet Dent 1994:72:259-67
  20. Derand T : The principal stress distribution in a root with a loaded post in model experiments. J Dent Res 1977:56:1463
  21. Farah JW. Craig RG, Sikarskie DL : Photoelastic and finite element stress analysis of a restored axisymmetric first molar. J Biomech 1973;6:511 https://doi.org/10.1016/0021-9290(73)90009-2
  22. Assif D, Bitenski A. Pilo R. Oren E : Effect of post design on resistence to fracture of endodontically treated teeth with complete crown. J Prosthet Dent 1993:69:36-40
  23. Vendonschot N. Fennis WM, Kuijs RH, Stolk J. Kreulen CM. Creugers NH : Generation of 3-D finite element models of restored human teeth using micro-CT tech-niques. Int J Prosthodont 2001: 14(4):310-5
  24. Isodor F. Odman P. Brondl겨m K : Intermittent loading of teeth restored using prefabri cated carbon fiber posts. Int J Prosthodont 1996:9:131-6
  25. Fredriksson M. Astback J. Pamenius M. Arvicdson K : A retrospective study of 236 patients with teeth restored by carbon fiberreinforced epoxy resin posts. J Prosthet Dent 1998:9:484-8
  26. Rosentritt M. Furer C. Behr M. Lang R. Handel G : Comparison of in vitro fracture strength of metallic and tooth-colored posts and cores. J Oral Rehabil 2000:27(7):595-601
  27. Cormier CJ. Burns DR. Moon P : In vitro comparison of the fracture resistence and failure mode of fiber. ceramic. and conventional post system at various stages of restoration. J Prosthet Dent 2001:10(1):26-36
  28. Kovarik PE. Breeding LC. Caughman WF : Fatigue life of three core materials under simulated chewing conditions. J Prosthet Dent 1992:68:584-90
  29. Chan RW. Bryant RW : Post-core foundations for endodontically treated posterior teeth. J Prosthet Dent 1982:48:401
  30. Oliva RA Lowe JA : Dimensional stability of composite used as a core material. J Prosthet Dent 1986:56:554
  31. Larson TD. Jensen JR : Microleakage of composite resin and amalgam core material under crowns. J Prosthet Dent 1980:44:40
  32. Freeman MA. Nicholls JI. Kydd WL. Harrington GW : Leakage associated with load fatigue-induced preliminary failure of full crowns placed over three different post and core system. J Endod 1998:24:26-32