Influência de dois tipos de retentores intra-radiculares e do tipo de coroa total na resistência e modo de fratura de raízes de incisivos superiores
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Data
2010-07-22
Autores
Zamboni, Sandra Regina Oliveira Costa [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O objetivo neste estudo foi avaliar e comparar a resistência à fratura de incisivos centrais restaurados usando dois tipos de pinos intra-radiculares: núcleo metálico fundido e pinos de fibra de quartzo, reconstruídos com diferentes tipos de coroas. A hipótese nula testada foi que a resistência a fratura desses corpos de prova não apresentariam diferença quanto ao tipo de pino e tipo de coroa. Sessenta incisivos centrais superiores foram divididos em 6 grupos: G1- núcleo metálico fundido + coroa em cerômero, G2- núcleo metálico fundido + coroa metalo-cerâmica, G3- núcleo metálico fundido + coroa em e-max, G4 – pino de fibra de quartzo e pinos acessórios + coroa em cerômero, G5- pino de fibra de quartzo e pinos acessórios + coroa metalo-cerâmica e G6- pino de fibra de quartzo e pinos acessórios + coroa em e-max. Todos os espécimes foram submetidos à ciclagem mecânica com freqüência de 2 Hz e 500.000 ciclos com carga de 3Kg. Os corpos de prova foram submetidos a teste de compressão em uma máquina universal de ensaios (Emic) com velocidade de carga de 1,0 mm/min até a sua fratura. Os valores de resistência à fratura foram G1- 47.44 ± 10.39, G2- 54.74 ±7.76, G3-49.71 ± 8.66, G4- 54.97 ± 8.67, G5-73.50 ± 11.83 e G6- 55.47 ± 10.62. A análise de variância (ANOVA) (p<0,05) mostrou diferença estatisticamente significante para os pinos. Quanto à análise de fratura, os núcleos metálicos fundidos apresentaram o maior número de amostras com fratura desfavoráveis quando comparados os pinos de fibra de quartzo. O conjunto pino de fibra restaurados com coroa metalo cerâmica, apresentou valor de resistência à fratura estatisticamente maior quando comparado aos demais grupos segundo o teste de Tukey (5%), Metalo cerâmica - 64,12±13,69 kgf, difere estatisticamente das demais coroas metal free - 52,59±9,88 kgf e cerômero - 51,20±10,08 kgf que...
The aim of this study was to compare the fracture resistance and failure of maxillary incisors restored using fiber post and metallic post under different types of full-coverage crowns. The null hypothesis tested was that fracture resistance and the failure pattern of these teeth were not affected by the use of fiber post, metallic post and typo of full coverage crown. Sixty maxillary incisors were divided into 6 groups of 10 each. G1- metallic post + metallic ceramic crowns, G2- metallic post + e-max system, G3- metallic post + cerômeros, G4- Fiber post and accessories post + metallic ceramic crowns, G5- Fiber post and accessories post + e-max system and G6- Fiber post and accessories post + cerômeros. The specimens were submitted a mechanical loading at a frequency of 2 Hz for a total of 500.000 cycles. After were taken to the Universal Test Machine for the fracture resistance at 1,0 mm/min speed. The fracture resistance values were G1- 47.44 ± 10.39, G2- 54.74 ±7.76, G3-49.71 ± 8.66, G4- 54.97 ± 8.67, G5-73.50 ± 11.83 e G6- 55.47 ± 10.62. Results show statistically significant differences in relation to the type of the posts (ANOVA) (p<0,05). Fracture analyses about metallic post showed the most unfavorable fracture and fiber post restored with metallic crown showed statistically significant difference in relation to the others groups. Tukey test (5%) showed Metallic-crown - 64,12±13,69 kgf, is statistically difference than the other crowns metal free - 52,59±9,88 kgf and Sinfony crowns - 51,20±10,08 kgf that was not different between itself. The result of this study indicate that the use of fiber posts increase their resistance to fracture and improve the prognosis in case of fracture
The aim of this study was to compare the fracture resistance and failure of maxillary incisors restored using fiber post and metallic post under different types of full-coverage crowns. The null hypothesis tested was that fracture resistance and the failure pattern of these teeth were not affected by the use of fiber post, metallic post and typo of full coverage crown. Sixty maxillary incisors were divided into 6 groups of 10 each. G1- metallic post + metallic ceramic crowns, G2- metallic post + e-max system, G3- metallic post + cerômeros, G4- Fiber post and accessories post + metallic ceramic crowns, G5- Fiber post and accessories post + e-max system and G6- Fiber post and accessories post + cerômeros. The specimens were submitted a mechanical loading at a frequency of 2 Hz for a total of 500.000 cycles. After were taken to the Universal Test Machine for the fracture resistance at 1,0 mm/min speed. The fracture resistance values were G1- 47.44 ± 10.39, G2- 54.74 ±7.76, G3-49.71 ± 8.66, G4- 54.97 ± 8.67, G5-73.50 ± 11.83 e G6- 55.47 ± 10.62. Results show statistically significant differences in relation to the type of the posts (ANOVA) (p<0,05). Fracture analyses about metallic post showed the most unfavorable fracture and fiber post restored with metallic crown showed statistically significant difference in relation to the others groups. Tukey test (5%) showed Metallic-crown - 64,12±13,69 kgf, is statistically difference than the other crowns metal free - 52,59±9,88 kgf and Sinfony crowns - 51,20±10,08 kgf that was not different between itself. The result of this study indicate that the use of fiber posts increase their resistance to fracture and improve the prognosis in case of fracture
Descrição
Palavras-chave
Materiais dentários, Incisivos (Dentes), Resistência à fratura, Retentor intra-radicular, Fracture resistance, Fiber posts, Dental materials
Como citar
ZAMBONI, Sandra Regina Oliveira Costa. Influência de dois tipos de retentores intra-radiculares e do tipo de coroa total na resistência e modo de fratura de raízes de incisivos superiores. 2010. 120 f. Tese (doutorado) – Faculdade de Odontologia de São José dos Campos, Universidade Estadual Paulista, 2010.