Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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FINITE ELEMENT ANALYSIS OF MAXILLARY CENTRAL INCISORS RESTORED WITH VARIOUS POST-AND-CORE APPLICATIONS

여러가지 post-and-core로 수복된 상악 중절치의 유한요소법적 연구

  • Seo, Min-Seock (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University) ;
  • Shon, Won-Jun (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University) ;
  • Lee, Woo-Cheol (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University) ;
  • Yoo, Hyun-Mi (Department of Conservative Dentistry, The Institute of Oral Health Science, Samsung Medical Center, Sungkyunkwan University School of Medicine) ;
  • Cho, Byeong-Hoon (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University) ;
  • Baek, Seung-Ho (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University)
  • 서민석 (서울대학교 치의학대학원 치과보존학교실) ;
  • 손원준 (서울대학교 치의학대학원 치과보존학교실) ;
  • 이우철 (서울대학교 치의학대학원 치과보존학교실) ;
  • 유현미 (성균관대학교 의과대학 삼성서울병원 치과보존과) ;
  • 조병훈 (서울대학교 치의학대학원 치과보존학교실) ;
  • 백승호 (서울대학교 치의학대학원 치과보존학교실)
  • Published : 2009.07.31
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Abstract

The purpose of this study was to investigate the effect of rigidity of post core systems on stress distribution by the theoretical technique, finite element stress-analysis method. Three-dimensional finite element models simulating an endodontically treated maxillary central incisor restored with a zirconia ceramic crown were prepared and 1.5 mm ferrule height was provided. Each model contained cortical bone, trabecular bone, periodontal ligament, 4 mm apical root canal filling, and post-and-core. Six combinations of three parallel type post (zirconia ceramic, glass fiber, and stainless steel) and two core (Paracore and Tetric ceram) materials were evaluated, respectively. A 50 N static occlusal load was applied to the palatal surface of the crown with a $60^{\circ}$angle to the long axis of the tooth. The differences in stress transfer characteristics of the models were analyzed. von Mises stresses were chosen for presentation of results and maximum displacement and hydrostatic pressure were also calculated. An increase of the elastic modulus of the post material increased the stress, but shifted the maximum stress location from the dentin surface to the post material. Buccal side of cervical region (junction of core and crown) of the glass fiber post restored tooth was subjected to the highest stress concentration. Maximum von Mises stress in the remaining radicular tooth structure for low elastic modulus resin core (29.21 MPa) was slightly higher than that for high elastic modulus resin core (29.14 MPa) in case of glass fiber post. Maximum displacement of glass fiber post restored tooth was higher than that of zirconia ceramic or stainless steel post restored tooth.

근관 치료된 치아의 수복에 있어서 파절은 가장 중요하게 고려되는 점이다. 포스트를 사용해서 수복한다는 것은 치수와 다른 단단한 물질을 근관 내에 삽입한다는 것으로 자연스럽지 못한 구조를 만들어서 고유의 응력분산을 변화시킨다. 오랫동안 수많이 in vitro 연구들이 post-and-core로 수복된 치아의 파절 저항에 대해서 이루어졌지만 어떤 것이 최상의 선택인지에 대해서는 많은 상충되는 관점들이 존재한다. 본 연구의 목적은 유한요소분석법을 사용하여 post-and-core system의 물리적인 성질이 치질의 응력분산에 미치는 영향을 분석하고 어떤 조합이 파절 저항에 도움이 되는지를 알아보는 것이다. 근관 치료된 상악 중절치를 삼차원 유한 요소법으로 Modeling하였다. 1.5 mm의 ferrule 높이를 부여하고 외관은 zirconia ceramic crown으로 지정하였다. 세가지 평행한 형태의 포스트 (zirconia ceramic, glass fiber, and stainless steel)와 두 가지 코어 (Paracore and Tetric ceram) 물질을 6개의 모델로 조합하였다. 각각의 모델은 해면골, 피질골, 치주인대, 그리고 4 mm 근관 충전을 가지도록 설계하였다. 50 N의 정적인 교합력이 치아 장축에서 60도 각도로 치관의 설면에 적용시켰다. 모델들의 응력전달 특징의 차이를 분석하였고, 결과를 나타내는 데는 Maximum von Mises stress 값을 사용하였고 최대 변위량과 정수압도 계산하였다. Glass fiber post로 수복된 경우 높은 탄성계수를 가진 레진 코어 모델 (29.14 MPa)에서 낮은 탄성계수의 코어 모델 (29.21 MPa)보다 더 낮은 응력이 발생하였다. Glass fiber post로 수복된 모델 (0.03497-0.03499 mm)은 다른 포스트로 수복된 모델들 (0.03245-0.03452 mm)보다 더 많은 최대 변위량을 보였다. 이는 glass fiber post로 수복된 치아의 경우가 상대적으로 치아에 가해지는 힘에 의해 더 많이 움직였다는 것을 보여준다. Zirconia ceramic 이나 stainless steel 과 같이 탄성계수가 큰 포스트는 응력을 증가시키지만 포스트가 스트레스를 대부분 흡수하여 치질에는 스트레스가 낮게 나타났다. Glass fiber post로 수복된 모델에서는 코어와 크라운이 만나는 순면 치경부에서 가장 높은 응력이 발생하였다.

Keywords

References

  1. Albuquerque RC, Polleto LT, Fontana RH, Cimini CA. Stress analysis of an upper central incisor restored with different posts. J Oral Rehabil 30: 936-943, 2003 https://doi.org/10.1046/j.1365-2842.2003.01154.x
  2. Hunter AJ, Feiglin B, Williams JF. Effects of post placement on endodontically treated teeth. J Prosthet Dent 62:166-172, 1989 https://doi.org/10.1016/0022-3913(89)90306-5
  3. Ottl P, Hahn L, Lower HC, Fay M. Fracture characteristics of carbon fiber, ceramic and non-palladium endodontic post systems at monotonously increasing loads. J Oral Rehabil 29:175-182, 2002 https://doi.org/10.1046/j.1365-2842.2002.00852.x
  4. Ko CC, Chu CS, Chung KH, Lee MC. Effects of posts on dentin stress distribution in pulpless teeth. J Prosthet Dent 68:421-427, 1992 https://doi.org/10.1016/0022-3913(92)90404-X
  5. Assif D, Gorfil C. Biomechanical considerations in restoring endodontically treated teeth. J Prosthet Dent 71:565-567, 1994 https://doi.org/10.1016/0022-3913(94)90438-3
  6. Caputo AA, Standlee JP. Biomechanics in Clinical Dentistry Chicago Quinte ssence Publishing Co, Inc 1987. p 185-203
  7. Rosnetritt M, Furer C, Behr M, Lang R, Handel G. Comparison of in vitro fracture strength of metallic and tooth-coloured posts and cores. J Oral Rehabil 27:595-601, 2000 https://doi.org/10.1046/j.1365-2842.2000.00548.x
  8. Yaman SD, Alacam T, Yamen Y. Analysis of stress distribution in a maxillary central incisor subjected to various post and core applications. J Endod 24:107-111, 1998 https://doi.org/10.1016/S0099-2399(98)80087-3
  9. Holmes DC, Diaz-Arnold AM, Leary JM. Influence of post dimension on stress distribution in dentin. J Prosthet Dent 75:140-147, 1996 https://doi.org/10.1016/S0022-3913(96)90090-6
  10. Pegoretti A, Fambri L, Zappini G, Bianchetti M. Finite element analysis of a glass fibre reinforced composite endodontic post. Biomaterials 23:2667-2682, 2002 https://doi.org/10.1016/S0142-9612(01)00407-0
  11. Eskitascioglu G, Belli S, Kalkan M. Evaluation of two post core systems using two different methods (fracture strength test and a finite elemental stress analysis). J Endod 28:629-633, 2002 https://doi.org/10.1097/00004770-200209000-00001
  12. Boschian PL, Guidotti S, Pietrabissa R, Gandliani M. Stress distribution in a post-restored tooth using the three-dimensional finite element method. J Oral Rehabil 33:690-697, 2006 https://doi.org/10.1111/j.1365-2842.2006.01538.x
  13. Manning KE, Yu DC, Yu KC, Kwan EW. Factors to consider for predictable post and core build-ups of endodontically treated teeth. Part Ⅱ: clinical application of basic concepts. J Canad Dent Assoc 61:696-707, 1995
  14. Sorrentino R, Salameh Z, Apicella D, Auriemma T, Zarone F, Apicella A, Ferrari M. Three-dimensional finite element analysis of stress and strain distributions in post-and-core treated maxillary central incisors. J Adhes Dent 9:527-536, 2007
  15. Sorrentino R, Aversa R, Ferro V, Auriemma T, Zarone F, Ferrari M, Apicella A. Three-dimensional finite element analysis of strain and stress distributions in endodontically treated maxillary central incisors restored with different post, core and crown materials. Dent Mater 23:983-993, 2007 https://doi.org/10.1016/j.dental.2006.08.006
  16. Pierrisnard L, Bohin F, Renault P, Barquins M. Corono-radicular reconstruction of pulpless teeth: a mechanical study using finite element analysis. J Prosthet Dent 88:442-448, 2002 https://doi.org/10.1067/mpr.2002.128376
  17. Asmussen E, Peutzfeldt A, Sahafi A. Finite element analysis of stresses in endodontically treated, dowelrestored teeth. J Prosthet Dent 94: 321-329, 2005 https://doi.org/10.1016/j.prosdent.2005.07.003
  18. 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 91:144-150, 2004 https://doi.org/10.1016/j.prosdent.2003.10.018
  19. Park JK, Hur B, Kim SK. The influence of combining composite resins with different elastic modulus on the stress distribution of class Ⅴ restoration: A threedimensional finite element study. J Kor Acad Cons Dent 33:184-197, 2008 https://doi.org/10.5395/JKACD.2008.33.3.184
  20. Park CS, Hur B, Kim KH, Son K, Park JK. The influence of occlusal load on stress distribution of cervical composite resin restorations: A three-diemnsional finite element study. J Kor Acad Cons Dent 33:246-257, 2008 https://doi.org/10.5395/JKACD.2008.33.3.246
  21. Sorensen JA, Engelman MJ. Ferrule design and fracture resistance of endodontically treated teeth. J Prosthet Dent 63:529-536, 1990 https://doi.org/10.1016/0022-3913(90)90070-S
  22. Ausiello P, Gee AJ, Rengo S, Davidson CL. Fracture resistance of endodontically treated premolars adhesively restored. Am J Dent 10: 237-241, 1997
  23. Sahafi A, Peutzfeldt A, Ravnholt G, Asmussen E, Gotfredsen K. Resistance to cyclic loading of teeth restored with posts. Clin Oral Investig 9:84-90, 2005 https://doi.org/10.1007/s00784-004-0299-7
  24. Eraslan O, Aykent F, Yucel MT, Akman S. Finite element analysis of the effect of ferrule height on stress distribution at post-and-core restored all-ceramic anterior crowns. Clin Oral Invest 2008;Aug 12. [Epub ahead of print] https://doi.org/10.1007/s00784-008-0217-5
  25. Ho MH, Lee SY, Chen HH, Lee MC. Three-dimensional finite element analysis of the effects of posts on stress distribution in dentin. J Prosthet Dent 72:367-372, 1994 https://doi.org/10.1016/0022-3913(94)90555-X
  26. Mannocci F, Ferrari M, Watson TF. Intermittent loading of teeth restored using quartz fiber, carbon-quartz fiber, and zirconium dioxide ceramic root canal posts. J Adhes Dent 1:153-158, 1999
  27. Asmussen E, Peutzfeldt A, Heitmann T. Stiffness, elastic limit, and strength of newer types of endodontic posts. J Dent 27:275-278, 1999 https://doi.org/10.1016/S0300-5712(98)00066-9
  28. Toksavul S, Zor M, Toman M, Gunror MA, Nergiz I, Artunc C. Analysis of dentinal stress distribution of maxillary central incisors subjected to various postand-core applications. Oper Dent 31:89-96, 2006 https://doi.org/10.2341/04-192
  29. Park JK, Hur B, Kim SK. Stress distribution of class Ⅴ composite resin restorations: A three-dimensional finite element study. J Kor Acad Cons Dent 33:28-38, 2008 https://doi.org/10.5395/JKACD.2008.33.1.028
  30. Barjau-Escribano A, Sancho-Bru JL, Forner-Navarro L, Rodriguez- Cervantes PJ, Perez-Gonzalez A, Sanchez-Marin FT. Influence of prefabricated post material on restored teeth: fracture strength and stress distribution. Oper Dent 31:47-54, 2006 https://doi.org/10.2341/04-169

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