TY - JOUR
T1 - Effect of Hygroscopic Expansion on the Push-Out Resistance of Glass Ionomer-Based Cements Used for the Luting of Glass Fiber Posts
AU - Cury, Álvaro H.
AU - Goracci, Cecilia
AU - de Lima Navarro, Maria Fidela
AU - Carvalho, Ricardo M.
AU - Sadek, Fernanda T.
AU - Tay, Franklin R.
AU - Ferrari, Marco
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2006/6
Y1 - 2006/6
N2 - This study examined the contribution of hygroscopic expansion of glass-ionomer (GIC) and resin modified glass-ionomer (RMGIC) luting cements to the push-out resistance of fiber posts. Glass fiber posts were luted to post spaces using different cements. Experimental specimens were stored in water, while control specimens were desiccated and stored in mineral oil to eliminate water from intraradicular dentinal tubules and/or the external environment that could have contributed to hygroscopic expansion of the cements. Thin slice push-out tests revealed no difference in retention strengths of resin composite cements that were stored in water or oil. Conversely, GIC and RMGIC cements exhibited increased retention strengths after water sorption. As unfavorable cavity geometry is taxing to dentin bond integrity in root canals, a strategy that relies on increasing the frictional resistance to post dislodgement via delayed hygroscopic expansion of glass-ionomer based materials may be a more pragmatic approach to fiber post retention.
AB - This study examined the contribution of hygroscopic expansion of glass-ionomer (GIC) and resin modified glass-ionomer (RMGIC) luting cements to the push-out resistance of fiber posts. Glass fiber posts were luted to post spaces using different cements. Experimental specimens were stored in water, while control specimens were desiccated and stored in mineral oil to eliminate water from intraradicular dentinal tubules and/or the external environment that could have contributed to hygroscopic expansion of the cements. Thin slice push-out tests revealed no difference in retention strengths of resin composite cements that were stored in water or oil. Conversely, GIC and RMGIC cements exhibited increased retention strengths after water sorption. As unfavorable cavity geometry is taxing to dentin bond integrity in root canals, a strategy that relies on increasing the frictional resistance to post dislodgement via delayed hygroscopic expansion of glass-ionomer based materials may be a more pragmatic approach to fiber post retention.
KW - Dislocation resistance
KW - fiber post
KW - glass-ionomer cement
KW - hygroscopic expansion
KW - resin modified glass-ionomer cement
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U2 - 10.1016/j.joen.2005.10.060
DO - 10.1016/j.joen.2005.10.060
M3 - Article
C2 - 16728245
AN - SCOPUS:33646693875
SN - 0099-2399
VL - 32
SP - 537
EP - 540
JO - Journal of endodontics
JF - Journal of endodontics
IS - 6
ER -