Fracture resistance of weakened human premolar roots after use of a glass fiber post together with accessory posts
Resistência à fratura de raízes de pré-molares fragilizadas com uso de pinos de fibra de vidro associados a pinos acessórios
Segato, Clarissa Estefani; Amaral, Flávia Lucisano Botelho do; França, Fabiana Mantovani Gomes; Flório, Flávia Martão; Basting, Roberta Tarkany
Abstract
Objective: To evaluate the fracture strength of human premolar teeth with wide root canals, restored with glass fiber posts and resin cement, together with different numbers of accessory posts. Material and method: Thirty-six premolars received standardized preparations that simulated weakened roots, and were divided into three groups (n=12): G0 - glass fiber post (Reforpost/Angelus) cementation with dual cure resin cement (Rely X ARC/3M ESPE); G1 - glass fiber post cementation and one accessory post (Reforpin/Angelus), with dual cure resin cement; G2 - glass fiber post cementation and two accessory posts, with dual cure resin cement. Resin composite cores were placed in each tooth. A metal coping was placed in a standardized position on the cores to perform the compressive tests using a test machine. Testing was performed applying a force parallel to the long axis of the teeth at a speed of 0.5 mm/min. Fracture mode was analyzed under a stereoscopic loupe, classified by scores. Result: the Analysis of Variance (ANOVA) was applied, and there was no statistical difference in the mean values of fracture strength among the groups (in kgf): G0 = 91.1 ± 56.9; G1 = 104.7 ± 66.6; G2 = 106.1 ± 51.9. Greater frequency of fracture or cracks was observed in the cervical one-third of the root in the teeth without cemented accessory posts, but no statistical difference was observed among the fracture modes. Conclusion: The number of accessory posts cemented into debilitated roots had no influence on either fracture strength or type of fracture of pre-molar roots.
Keywords
Resumo
Objetivo: Avaliar a resistência à fratura de pré-molares com canais alargados restaurados com pinos de fibra de vidro e cimento resinoso com diferentes quantidades de pinos acessórios. Material e método: Trinta e seis pré‑molares receberam preparos padronizados que simularam raízes fragilizadas e foram separados em três grupos (n=12): G0 - pino de fibra de vidro (Reforpost/Angelus) cimentado com cimento resinoso dual (Rely X ARC/3M ESPE); G1 - pino de fibra de vidro e um pino acessório (Reforpin/Angelus) cimentados com cimento resinoso dual; G2 - pino de fibra de vidro e dois pinos acessórios cimentados com cimento resinoso dual. Núcleos de preenchimento em resina composta foram confeccionados para cada dente. Um coping metálico foi posicionado de forma padronizada sobre o núcleo de preenchimento para a realização dos ensaios de resistência à fratura em máquina de ensaios. Os testes foram realizados com aplicação de força paralela ao longo eixo do dente com velocidade de 0,5 mm/min. O modo de fratura foi avaliado com lupa estereoscópica em escores. Resultado: Análise de Variância (ANOVA) foi aplicada e mostrou não haver diferenças significativas nos valores de resistência à fratura entre os grupos (em kgf): G0 = 91,1 ± 56,9; G1 = 104,7 ± 66,6; G2 = 106,1 ± 51,9. Maior frequência de fraturas ou trincas foram observadas no terço cervical das raízes na ausência de pinos acessórios, mas não houve diferenças significativas entre os modos de fraturas entre os grupos. Conclusão: A quantidade de pinos acessórios cimentados em raízes fragilizadas não influenciou a resistência à fratura ou modo de falha das raízes de pré-molares.
Palavras-chave
References
1. Morgano SM, Rodrigues AH, Sabrosa CE. Restoration of endodontically treated teeth. Dent Clin North Am. 2004 Apr; 48(2):vi, 397-416. PMid:15172607. http://dx.doi.org/10.1016/j.cden.2003.12.011
2. Jongsma LA, Ir NJ, Kleverlaan CJ, Feilzer AJ. Reduced contraction stress formation obtained by a two-step cementation procedure for fiber posts. Dent Mater. 2011July; 27(7): 670-6. PMid:21514652. http://dx.doi.org/10.1016/j.dental.2011.03.008
3. Isidor F, Odman P, Brondum, K. Intermittent loading of teeth restored using prefabricated carbon fiber post. Int J Prosthet.1996; 9 (3): 131-6.
4. Gutmann JL. The dentin-root complex: anatomic and biologic considerations in endodontically treated teeth. J Prosthet Dent. 1992 Apr; 67(4): 458-67. http://dx.doi.org/10.1016/0022-3913(92)90073-J
5. Zogheib LV, Pereira JR, do Vale AL, de Oliveira JA, Pegoraro LF. Fracture resistance of weakened roots restored with composite resin and glass fiber post. Braz Dent J. 2008; 19(4): 329-33. PMid:19180323. http://dx.doi.org/10.1590/S0103-64402008000400008
6. Clavijo VG, Reis JM, Kabbach W, Silva AL, Oliveira Júnior OB, Andrade MF. Fracture strength of flared bovine roots restored with different intraradicular posts. J Appl Oral Sci. 2009 Nov-Dec; 17(6): 574-8. PMid:20027429. http://dx.doi.org/10.1590/S1678-77572009000600007
7. Christensen GJ. Posts: necessary or unnecessary? J Am Dent Assoc. 1996 Oct; 127(10): 1522-6. PMid:8908923. http://dx.doi.org/10.14219/ jada.archive.1996.0063
8. Lui JL. A technique to reinforce weakened roots with post canals. Endod Dent Traumatol. 1987 Dec; 3(6): 310-4. PMid:3326726. http:// dx.doi.org/10.1111/j.1600-9657.1987.tb00641.x
9. Carvalho CA, Valera MC, Oliveira LD, Camargo CH. Structural resistance in immature teeth using root reinforcements in vitro. Dent Traumatol. 2005June; 21(3): 155-9. PMid:15876327. http://dx.doi.org/10.1111/j.1600-9657.2005.00312.x
10. Fokkinga WA, Kreulen CM, Vallittu PK, Creugers NH. A structured analysis of in vitro failure loads and failure modes of fiber, metal and ceramic post-and-core systems. Int J Prosthodont. 2004 Jul-Aug; 17(4): 476-82. PMid:15382786.
11. Genovese K, Lamberti L, Pappalettere C. Finite element analysis of a new customized composite post system for endodontically treated teeth. J Biomech. 2005 Dec; 38(12): 2375-89. PMid:16214485. http://dx.doi.org/10.1016/j.jbiomech.2004.10.009
12. Kimmel SS. Restoration and reinforcement of endodontically treated with a polyethylene ribbon and prefabricated fiberglass post. Gen Dent. 2000 Nov-Dec; 48(6): 700-6. PMid:12004666.
13. Newman MP, Yaman P, Dennison J, Rafter M, Billy E. Fracture resistance of endodontically treated teeth restored with composite posts. J Prosthet Dent. 2003 Apr; 89(4): 360-7. PMid:12690348. http://dx.doi.org/10.1067/mpr.2003.75
14. Silva GR, Santos-Filho PC, Simamoto-Júnior PC, Martins LR, Mota AS, Soares CJ. Effect of post type and restorative techniques on the strain and fracture resistance of flared incisor roots. Braz Dent J. 2011; 22(3): 230-7. PMid:21915521. http://dx.doi.org/10.1590/S0103- 64402011000300009
15. Zogheib LV, Saavedra GS, Cardoso PE, Valera MC, Araújo MA. Resistance to compression of weakened roots subjected to different root reconstruction protocols. J Appl Oral Sci. 2011 Nov-Dec; 19(6): 648-54. PMid:22231002 PMCid:PMC3973469. http://dx.doi.org/10.1590/ S1678-77572011000600018
16. Costa RG, De Morais EC, Campos EA, Michel MD, Gonzaga CC, Correr GM. Customized fiber glass posts. Fatigue and fracture resistance. Am J Dent. 2012 Feb; 25(1): 35-8. PMid:22558690.
17. Soares CJ, Martins LR, Fonseca RB, Correr-Sobrinho L, Fernandes Neto AJ. Influence of cavity preparation design on fracture resistance of posterior leucite-reinforced ceramic restorations. J Prosthet Dent. 2006 Jun; 95(6): 421-9. PMid:16765154. http://dx.doi.org/10.1016/j. prosdent.2006.03.022
18. Naumann M, Preuss A, Rosentritt M. Effect of incomplete crown ferrules on load capacity of endodontically treated maxillary incisors restored with fiber posts, composite build-ups, and all-ceramic crowns: An in vitro evaluation after chewing simulation. Acta Odont Scand. 2006 Feb; 64(1): 31-6. PMid:16428180. http://dx.doi.org/10.1080/00016350500331120
19. Soares CJ, Soares PV, de Freitas Santos-Filho PC, Castro CG, Magalhães D, Versluis A. The influence of cavity design and glass fiber posts on biomechanical behavior of endodontically treated premolars. J Endod. 2008 Aug; 34(8): 1015-9. PMid:18634938. http://dx.doi. org/10.1016/j.joen.2008.05.017
20. Barjau-Escribano A, Sancho-Bru JL, Forner-Navarro L, Rodríguez-Cervantes PJ, Pérez-Gónzález A, Sánchez-Marín FT. Influence of prefabricated post material on restored teeth: fracture strength and tensions distribution. Oper Dent. 2006 Jan-Feb; 31(1): 47-54. PMid:16536193. http://dx.doi.org/10.2341/04-169
21. Maccari PC, Cosme DC, Oshima HM, Burnett Junior LH, Shinkai RS. Fracture strength of endodontically treated teeth with flared root canals and restored with different post systems. J Esthet Restor Dent. 2007; 19(1): 30-6. PMid:17244147. http://dx.doi.org/10.1111/j.1708- 8240.2006.00060.x
22. Maccari PCA, Conceição EM, Nunes MF. Fracture resistance of endodontically treated teeth restored with three different esthetic posts. J Esthet Restor Dent. 2003; 15(1): 25-30. PMid:12638770. http://dx.doi.org/10.1111/j.1708-8240.2003.tb00279.x
23. Feilzer AJ, De Gee AJ, Davidson CL. Setting stress in composite in relation to configuration of the restoration. J Dent Res. 1987 Nov; 66(11): 1636-9. PMid:10872397. http://dx.doi.org/10.1177/00220345870660110601
24. Braga RR, Cesar PF, Gonzaga CC. Mechanical properties of resin cements with different activation modes. J Oral Rehabil. 2002 Mar; 29(3): 257-62. PMid:11896842. http://dx.doi.org/10.1046/j.1365-2842.2002.00821.x
25. Abou-Id LR, Morgan LF, Silva GA, Poletto LT, Lanza LD, Albuquerque Rde C. Ultrastructural evaluation of the hybrid layer after cementation of fiber posts using adhesive systems with different curing modes. Braz Dent J. 2012 Mar/Apr; 23(2): 116-21. PMid:22666768. http://dx.doi.org/10.1590/S0103-64402012000200005
26. Ceballos L, Garrido MA, Fuentes V, Rodriguez J. Mechanical characterization of resin cements used for luting fiber posts by nanoindentation. Dent Mater. 2007 Jan; 23(1): 100-5. PMid:16430956. http://dx.doi.org/10.1016/j.dental.2005.12.007
Facebook
Google+
Twitter
LinkedIn
Mendeley
StumbleUpon
CiteULike
Reddit
Email