TY - JOUR
T1 - Light curable dental composites designed with colloidal crystal reinforcement
AU - Wan, Quan
AU - Sheffield, Joel
AU - McCool, John
AU - Baran, George
N1 - Funding Information:
The support of NIH through grant R21DE018330 is gratefully appreciated. We thank Esstech for the donation of resin materials.
PY - 2008/12
Y1 - 2008/12
N2 - Objectives: Methods to prepare dental composites with a periodic filler arrangement were developed following a strategy of colloidal crystallization. The aims of this study were to determine the influence of suspension medium, silane treatment and amine additive on colloidal particle redispersion and subsequent ordering, and to evaluate the effect of filler ordering on mechanical properties of composites. Methods: Dry monodisperse silica particles (spherical, ∼500-nm diameter) were redispersed in selected solvents and monomers (e.g. triethyleneglycol dimethacrylate, TEGDMA) to form sediments or dispersions with ordered particle arrangements. Ordering was evaluated by microscopy and mechanical properties of the composites were measured using compression tests (n = 6). Results: A face-centered cubic packed structure could form in both the sediment from silica dispersions in polar solvents and stable dispersions in TEGDMA. Dimethylaminoethyl methacrylate (DMAEMA) was found to disrupt an ordered structure when non-silanized silica particles were used. Silanization with 3-methacryloxypropyl trimethoxysilane (MPS) promoted filler ordering. Standard compression tests on composites containing 60 wt% silica in TEGDMA with or without DMAEMA indicated that DMAEMA had a clearly significant effect (p < 0.05) on failure strain, compressive strength, and toughness, and a marginally significant effect on modulus (p = 0.12). Significance: Significant increases in compressive strength (16%), failure strain (71%), and toughness (135%) were observed for composites with ordered filler compared to non-ordered composites.
AB - Objectives: Methods to prepare dental composites with a periodic filler arrangement were developed following a strategy of colloidal crystallization. The aims of this study were to determine the influence of suspension medium, silane treatment and amine additive on colloidal particle redispersion and subsequent ordering, and to evaluate the effect of filler ordering on mechanical properties of composites. Methods: Dry monodisperse silica particles (spherical, ∼500-nm diameter) were redispersed in selected solvents and monomers (e.g. triethyleneglycol dimethacrylate, TEGDMA) to form sediments or dispersions with ordered particle arrangements. Ordering was evaluated by microscopy and mechanical properties of the composites were measured using compression tests (n = 6). Results: A face-centered cubic packed structure could form in both the sediment from silica dispersions in polar solvents and stable dispersions in TEGDMA. Dimethylaminoethyl methacrylate (DMAEMA) was found to disrupt an ordered structure when non-silanized silica particles were used. Silanization with 3-methacryloxypropyl trimethoxysilane (MPS) promoted filler ordering. Standard compression tests on composites containing 60 wt% silica in TEGDMA with or without DMAEMA indicated that DMAEMA had a clearly significant effect (p < 0.05) on failure strain, compressive strength, and toughness, and a marginally significant effect on modulus (p = 0.12). Significance: Significant increases in compressive strength (16%), failure strain (71%), and toughness (135%) were observed for composites with ordered filler compared to non-ordered composites.
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U2 - 10.1016/j.dental.2008.04.003
DO - 10.1016/j.dental.2008.04.003
M3 - Article
C2 - 18499245
AN - SCOPUS:54049118442
SN - 0109-5641
VL - 24
SP - 1694
EP - 1701
JO - Dental Materials
JF - Dental Materials
IS - 12
ER -