TY - JOUR
T1 - The influence of short and medium-term water immersion on the hydrolytic stability of novel low-shrink dental composites
AU - Palin, William
AU - Fleming, Garry
AU - Burke, Frederick
AU - Marquis, Peter
AU - Randall, RC
PY - 2005/9/1
Y1 - 2005/9/1
N2 - 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.
AB - 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.
KW - water sorption
KW - silorane
KW - bi-axial flexure strength
KW - diffusion coefficient
KW - Weibull modulus
KW - oxirane
UR - http://www.scopus.com/inward/record.url?scp=23444437486&partnerID=8YFLogxK
U2 - 10.1016/j.dental.2005.01.004
DO - 10.1016/j.dental.2005.01.004
M3 - Article
C2 - 15935464
SN - 1879-0097
VL - 21
SP - 852
EP - 863
JO - Dental Materials
JF - Dental Materials
IS - 9
ER -