Effect of cement type and water storage time on the push-out bond strength of a glass fiber post

Brazilian Dental Journal

Kátia Rodrigues Reis²  George Miguel Spyrides²  Jonas Alves De Oliveira¹  Alexandre Abrão Jnoub¹  Kátia Regina Hostilio Cervantes Dias¹  Gerson Bonfantes¹ 

[1] ,Federal University of Rio de Janeiro Dental School Department of ProsthodonticsRio de Janeiro RJ ,Brazil

关键词: fiber post;    resin cement;    glass ionomer cement;    hygroscopic ex;   

DOI  :  10.1590/S0103-64402011000500002

来源: SciELO

【 摘 要 】

This study investigated the effects of the cement type and the water storage time on the push-out bond strength of a glass fiber post. Glass fiber posts (Fibrekor, Jeneric Pentron) were luted to post spaces using a self-cured resin cement (C&B Cement [CB]), a glass ionomer cement (Ketac Cem [KC]) or a resin-modified glass ionomer cement (GC FujiCEM [FC]) according to the manufacturers’ instructions. For each luting agent, the specimens were exposed to one of the following water storage times (n=5): 1 day (T1), 7 days (T7), 90 days (T90) and 180 days (T180). Push-out tests were performed after the storage times. Control specimens were not exposed to water storage, but subjected to the push-out test 10 min after post cementation. Data (in MPa) were analyzed by Kruskal-Wallis and Dunn`s test (α=0.05). Cement type and water storage time had a significant effect (p<0.05) on the push-out bond strength. CB showed significantly higher values of retention (p<0.05) than KC and FC, irrespective of the water storage time. Water storage increased significantly the push-out bond strength in T7 and T90, regardless of the cement type (p<0.05). The results showed that fiber posts luted to post spaces with the self-cured resin cement exhibited the best bonding performance throughout the 180-day water storage period. All cements exhibited a tendency to increase the bond strength after 7 and 90 days of water storage, decreasing thereafter.

【 授权许可】

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