4.6 Article

The influence of short and medium-term water immersion on the hydrolytic stability of novel low-shrink dental composites

Journal

DENTAL MATERIALS
Volume 21, Issue 9, Pages 852-863

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.dental.2005.01.004

Keywords

oxirane; silorane; water sorption; diffusion coefficient; bi-axial flexure strength; Weibull modulus

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Objectives. Differences in mechanical and physical properties exhibited by novel low-shrink resin-based composite (RBC) formulations compared with conventional methacrylate RBCs may contribute to the clinical success of the candidate material. The aim of the current study was to investigate the effect of water uptake characteristics and water solubility on the mechanical properties of two methacrylate (Z100 and Filtek (TM) Z250), an experimental oxirane (OXI) and silorane (SIL) RBC following short- and medium-term immersion. Methods. The water sorption/solubility and associated diffusion coefficients of each material (n = 5) were measured using gravimetric analysis following short- (0.1, 0.5, 1, 4, 24 and 48 h) and medium-term (1, 4, 12 and 26w) immersion. The bi-axial flexure strength, associated Weibull moduli (n=20) and fracture analysis using scanning electron microscopy (SEM) of each material for similar immersion periods was also investigated. Results. Following 0.5 h and each subsequent short- and medium-term immersion period the water sorption of Z100 and Filtek (TM) Z250 was decreased compared with OXI. A significant decrease in bi-axial flexure strength and associated increase in filter particle exfoliation identified through SEM, was identified for OXI compared with Z100, Filtek (TM) Z250 and SIL following 26w immersion. SIL exhibited the significantly lowest water sorption, solubility and associated diffusion coefficient following each immersion period. Significance. The increase in water sorption, solubility and the associated diffusion coefficient of the experimental oxirane RBC, OXI was manifested as a significant decrease in bi-axial flexure strength and attributed to the decrease in synergy between the filter particles and resin matrix. The decreased water sorption, solubility and associated diffusion coefficient of the experimental silorane RBC, SIL may potentially improve hydrolytic stability of RBC restorations demonstrated by the non-significant decrease in bi-axial flexure strength following medium-term immersion. (c) 2005 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.

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