1. Effect of cement type and water storage time on the push-out bond strength of a glass fiber post.
- Author
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Reis KR, Spyrides GM, Oliveira JA, Jnoub AA, Dias KR, and Bonfantes G
- Subjects
- Absorption, Adsorption, Boron Compounds chemistry, Composite Resins chemistry, Dental Cements classification, Dental Pulp Cavity anatomy & histology, Dentin anatomy & histology, Glass Ionomer Cements chemistry, Humans, Magnesium Oxide chemistry, Materials Testing, Methacrylates chemistry, Methylmethacrylates chemistry, Polycarboxylate Cement chemistry, Resin Cements chemistry, Root Canal Preparation methods, Stress, Mechanical, Time Factors, Zinc Oxide chemistry, Dental Bonding, Dental Cements chemistry, Glass chemistry, Post and Core Technique instrumentation, Water chemistry
- Abstract
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.
- Published
- 2011
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