Revista de Odontologia da UNESP
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: 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.


Post and core technique, resin cements, tensile strength


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.


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


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