Revista de Odontologia da UNESP
http://revodontolunesp.com.br/article/doi/10.1590/1807-2577.09218
Revista de Odontologia da UNESP
Original Article

Fracture resistance of metal-ceramic crown copings cemented to two types of intra-radicular posts

Resistência à fratura de copings de coroa metalocerâmica cimentados sobre dois tipos de retentores intrarradiculares

Priscila Alonso HENRIQUES; André Hayato SAGUCHI; Fábio Valverde Rodrigues BASTOS NETO; Igor PROKOPOWITSCH; Angela Toshie ARAKI

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Abstract

Abstract: Introduction: Endodontically treated teeth are more susceptible to root fracture than vital teeth. In order to reduce the risk of fracture, the use of intra-radicular posts and crowns is indicated. However, their own fracture resistance remains unclear.

Objective: To analyze the behavior of metal-ceramic crown copings cemented to two types of intra-radicular posts under tensile stress.

Material and method: Sixteen metal-ceramic crown copings cemented with zinc phosphate cement to cast metal posts and cores (group 1, n = 8) or with self-adhesive resin cement to glass-fiber posts rebased with composite resin (group 2, n = 8) were subjected to tensile testing after endodontic treatment and standardized preparation. Failure occurred when the crown coping and/or post-core assembly fractured and/or detached.

Result: In group 1, after the application of a mean tensile load of 46.83 N, 7 crown copings and metal cores separated as a whole, while in 1 specimen the coping detached from the metal core. In group 2, a mean tensile load of 127.68 N resulted in glass-fiber post fracture, and in 1 case the entire crown-post-core assembly was detached. Tensile strength differed significantly between the two groups (p = 0.0085).

Conclusion: Our findings suggest that metal-ceramic crown copings cemented with self-adhesive resin cement show strong adhesion to composite resin cores associated with glass-fiber posts, thus providing a safe alternative to the use of cast metal posts and cores.

Keywords

Post and core technique, resin cements, tensile strength

Resumo

Resumo: Introdução: Os dentes tratados endodonticamente são mais suscetíveis à fratura radicular do que os dentes vitais. Para reduzir o risco de fratura, indica-se o uso de coroas e retentores intrarradiculares. No entanto, ainda não está clara a resistência dessas estruturas a fraturas.

Objetivo: Analisar o comportamento de copings de coroa metalocerâmica cimentados com dois tipos de retentores intrarradiculares sob tensão de tração.

Material e método: Dezesseis copings de coroa metalocerâmica cimentados com cimento de fosfato de zinco para núcleos e pinos de metal fundido (grupo 1, n = 8) ou com cimento resinoso autoadesivo para núcleos de resina composta com pinos de fibra de vidro (grupo 2, n = 8) foram submetidos a testes de tração após tratamento endodôntico e preparo padronizado. Houve falha quando o coping da coroa e/ou a estrutura pino-núcleo se quebrou e/ou se soltou.

Resultado: No grupo 1, após a aplicação de uma carga de tração média de 46,83 N, 7 copings e núcleos metálicos se separaram completamente, enquanto em 1 espécime o coping se soltou do núcleo metálico. No grupo 2, uma carga de tração média de 127,68 N resultou em fratura do pino de fibra de vidro, e em 1 caso toda a estrutura coroa-pino-núcleo se soltou. A resistência à tração foi significativamente diferente entre os dois grupos ( P = 0,0085).

Conclusão: Nossos achados sugerem que copings de coroa metalocerâmica cimentados com cimento resinoso autoadesivo apresentam forte adesão aos núcleos de resina composta associados aos pinos de fibra de vidro, proporcionando uma alternativa segura ao uso de retentores de metal fundido.
 

Palavras-chave

Técnica para retentor intrarradicular, cimentos de resina, resistência à tração

References

Sorensen JA, Martinoff JT. Intracoronal reinforcement and coronal coverage: a study of endodontically treated teeth. J Prosthet Dent. 1984 Jun;51(6):780-4. http://dx.doi.org/10.1016/0022-3913(84)90376-7. PMid:6376780.

Bonfante G, Kaizer OB, Pegoraro LF, do Valle AL. Fracture strength of teeth with flared root canals restored with glass fibre posts. Int Dent J. 2007 Jun;57(3):153-60. http://dx.doi.org/10.1111/j.1875-595X.2007.tb00118.x. PMid:17695735.

Zogheib LV, Pereira JR, Valle AL, 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. http://dx.doi.org/10.1590/S0103-64402008000400008. PMid:19180323.

Pereira JR, Valle AL, Shiratori FK, Ghizoni JS, Melo MP. Influence of intraradicular post and crown ferrule on the fracture strength of endodontically treated teeth. Braz Dent J. 2009;20(4):297-302. http://dx.doi.org/10.1590/S0103-64402009000400006. PMid:20069252.

Zhou L, Wang Q. Comparison of fracture resistance between cast posts and fiber posts: a meta-analysis of literature. J Endod. 2013 Jan;39(1):11-5. http://dx.doi.org/10.1016/j.joen.2012.09.026. PMid:23228250.

Ambica K, Mahendran K, Talwar S, Verma M, Padmini G, Periasamy R. Comparative evaluation of fracture resistance under static and fatigue loading of endodontically treated teeth restored with carbon fiber posts, glass fiber posts, and an experimental dentin post system: an in vitro study. J Endod. 2013 Jan;39(1):96-100. http://dx.doi.org/10.1016/j.joen.2012.07.003. PMid:23228265.

Maceri F, Martignoni M, Vairo G. Mechanical behaviour of endodontic restorations with multiple prefabricated posts: a finite-element approach. J Biomech. 2007;40(11):2386-98. http://dx.doi.org/10.1016/j.jbiomech.2006.11.018. PMid:17254588.

Uy JN, Lian JN, Nicholls JI, Tan KB. Load-fatigue performance of gold crowns luted with resin cements. J Prosthet Dent. 2006 Apr;95(4):315-22. http://dx.doi.org/10.1016/j.prosdent.2006.01.016. PMid:16616130.

Furuya Y, Huang SH, Takeda Y, Fok A, Hayashi M. Fracture strength and stress distributions of pulpless premolars restored with fiber posts. Dent Mater J. 2014;33(6):852-8. http://dx.doi.org/10.4012/dmj.2014-113. PMid:25483385.

Silva GR, Santos-Filho PC, Simamoto-Junior 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. http://dx.doi.org/10.1590/S0103-64402011000300009. PMid:21915521.

Goracci C, Ferrari M. Current perspectives on post systems: a literature review. Aust Dent J. 2011 Jun;56(Suppl 1):77-83. http://dx.doi.org/10.1111/j.1834-7819.2010.01298.x. PMid:21564118.

Torres-Sánchez C, Montoya-Salazar V, Córdoba P, Vélez C, Guzmán-Duran A, Gutierrez-Pérez JL, et al. Fracture resistance of endodontically treated teeth restored with glass fiber reinforced posts and cast gold post and cores cemented with three cements. J Prosthet Dent. 2013 Aug;110(2):127-33. http://dx.doi.org/10.1016/S0022-3913(13)60352-2. PMid:23929374.

Valdivia ADCM, Novais VR, Menezes MS, Roscoe MG, Estrela C, Soares CJ. Effect of surface treatment of fiberglass posts on bond strength to root dentin. Braz Dent J. 2014;25(4):314-20. http://dx.doi.org/10.1590/0103-6440201300143. PMid:25250495.

Oliveira LV, Maia TS, Zancopé K, Menezes MS, Soares CJ, Moura CCG. Can intra-radicular cleaning protocols increase the retention of fiberglass posts? A systematic review. Braz Oral Res. 2018 Mar;32(0):e16. http://dx.doi.org/10.1590/1807-3107bor-2018.vol32.0016. PMid:29561949.

Lad PP, Kamath M, Tarale K, Kusugal PB. Practical clinical considerations of luting cements: A review. J Int Oral Health. 2014 Feb;6(1):116-20. PMid:24653615.

Marchionatti AME, Valli V, Wandscher VF, Monaco C, Baldissara P. Influence of elastic modulus of intraradicular posts on the fracture load of roots restored with full crowns. Rev Odontol UNESP. 2017 Aug;46(4):232-7. http://dx.doi.org/10.1590/1807-2577.01617.

Pereira JR, Valle AL, Ghizoni JS, Só MV, Ramos MB, Lorenzoni FC. Evaluation of push-out bond strength of four luting agents and SEM observation of the dentine/fibreglass bond interface. Int Endod J. 2013 Oct;46(10):982-92. http://dx.doi.org/10.1111/iej.12089. PMid:23488736.

Han L, Okamoto A, Fukushima M, Okiji T. Evaluation of physical properties and surface degradation of self-adhesive resin cements. Dent Mater J. 2007 Nov;26(6):906-14. http://dx.doi.org/10.4012/dmj.26.906. PMid:18203498.

Behr M, Rosentritt M, Wimmer J, Lang R, Kolbeck C, Burgers R, et al. Self-adhesive resin cement versus zinc phosphate luting material: a prospective clinical trial begun 2003. Dent Mater. 2009 May;25(5):601-4. http://dx.doi.org/10.1016/j.dental.2008.11.003. PMid:19100611.

Johnson GH, Lepe X, Zhang H, Wataha JC. Retention of metal-ceramic crowns with contemporary dental cements. J Am Dent Assoc. 2009 Sep;140(9):1125-36. http://dx.doi.org/10.14219/jada.archive.2009.0340. PMid:19723946.
 

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