Characterization of commercial soft liners by dynamic mechanical analysis

Kalachandra, S.; Minton, R. J.; Takamata, Tetsuya; Taylor, D.F.

doi:10.1007/bf00146859

Cited by 14 publications

(7 citation statements)

References 18 publications

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“…Tables 1 and 2 give a summary of the mean storage modulus and tan ± at 26, 37, 50 and 80 ± C for the un lled and lled materials, respectively. As has been observed elsewhere [17][18][19][20], in all systems, there was a decrease in E 0 as the temperature increased. This reduction is mainly due to the methacrylate phase and the systems with the highest amount of HDMA (60%) showed the greatest ratio of reduction with increasing temperature.…”

Section: Resultssupporting

confidence: 59%

“…The materials investigated in this study satis ed these two criteria. The tan ± values obtained in this study were within the range previously obtained for other commercial systems [17][18][19]. In contrast, the modulus values obtained for materials with greater than 40% HDMA in both the un lled and lled were undesirably high for soft lining applications.…”

Section: Resultssupporting

confidence: 54%

“…Dynamic mechanical analysis (DMA) was used to investigate the effect of lling through the parameters of storage modulus and tan ±. DMA has been shown to be useful in investigating the viscoelastic properties of both commercial [17][18][19] and experimental soft liners [18,20]. Quasi-static mechanical testing was also carried out to determine the ultimate tensile strength and elongation to break.…”

Section: Introductionmentioning

confidence: 99%

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Silica-filled elastomer/methacrylate systems as soft liners

Nazhat

Parker²,

Braden³

2004

Journal of Biomaterials Science, Polymer Edition

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Denture soft lining materials are compliant cushions used at the oral tissue-denture interface. They are generally required to have sufficient compliance to redistribute mastication load, as well as an adequate modulus for long-term dimensional stability and control over the water uptake. This study investigated the effect of using silane treated fumed silica as a filler on the properties of experimental soft lining materials based on blends of isoprene-styrene (SIS) block co-polymer and mixtures of methyl methacrylate (MMA) and 1,6-hexandiol dimethacrylate (HDMA). The overall elastomer/monomer ratios were maintained, whereas the monomers ranged from 10 to 60% HDMA. The silica filler level was maintained at 10 wt% with respect to SIS. The properties investigated were the dynamic mechanical parameters of storage modulus (E') and tan delta as a function of temperature and the quasi-static mechanical parameters of ultimate tensile strength (UTS) and elongation to break (Eb) as well as absorption properties that were carried out in water and saline. In both unfilled and filled systems there was an increase in E' and a decrease in tan delta with an increase in HDMA. Silica addition tended to increase E' and substantially reduce tan delta in materials with less than 20% HDMA. UTS decreased with filler and HDMA content, however, Eb was greater for filled systems. Generally, in the long term, the water uptake decreased with increasing HDMA content and E'. The silanated silica further reduced the water uptake, indicating a cross-linking effect, thus increasing the restraining force on droplet growth. The uptake in saline was significantly reduced indicating an osmotically controlled uptake process.

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Section: Resultssupporting

confidence: 59%

Section: Resultssupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Silica-filled elastomer/methacrylate systems as soft liners

Nazhat

Parker²,

Braden³

2004

Journal of Biomaterials Science, Polymer Edition

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“…4 DMA has been also employed to characterize the viscoelastic properties of commercially available dental lining materials. [5][6][7] DMA may be used to characterize both the rate and extent of polymerization, as such processes are associated with time-dependent changes in the elastic modulus. Recently, the storage modulus of highly filled Bis-GMA (bisphenol-A glycerolate dimethacrylate) composites within PTFE tube has been monitored during light-cure and corrected into that of the composites without the tube.…”

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confidence: 99%

Dynamic Mechanical Properties of a Visible Light Curable Urethane Dimethacrylate Based Dental Resin

Lee

Kim

Lim

2003

Polym J

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ABSTRACT:The purpose of this study was to evaluate dynamic mechanical properties of urethane dimethacrylate (UDMA) and triethylene glycol dimethacrylate (TEGDMA) based dental resin. Dynamic mechanical properties of a visible light (λ = 400-500 nm) curable UDMA/TEGDMA (70:30 in wt%) resin were investigated for specimens uncured, light-cured for 40 s, and heated to 175• C subsequent to the irradiation for 40 s. Differential scanning calorimetry (DSC)was also employed as a complementary technique. For the light-cured specimen, two abrupt drops in the log storage modulus (E ) and two peaks in the tan δ vs. temperature curve corresponding to the glass transition were observed. The storage modulus was slightly increased with increasing temperature between the two modulus drops. The DSC experiment showed that the light-cured specimen contains residual living groups trapped by the fast reaction, which lead to further reaction during post-cure heat treatment. This further thermal reaction is considered to be responsible for the modulus increase. After heating to 175• C above the DSC exothermic peak, most of the residual groups in the light-cured specimen were found to be reacted, showing a single decrease in modulus and a single peak in the tan δ curve, and no exotherm in the DSC curve. With the aid of DSC data, the further thermal cure reaction with increasing temperature may occur within the glass transition region. The occurrence of the thermal reaction gives rise to the inaccuracy in determining the glass transition temperature (T g ). KEY WORDS Dynamic Mechanical Analysis (DMA) / DSC / UDMA / Storage Modulus / Tan δ / Glass Transition / It is well known that the dynamic mechanical analysis (DMA) is a very powerful technique for studying not only solid and viscoelastic liquids but also reactive materials undergoing changes in low molecular weight monomer to high molecular weight network. 1 The DMA technique is to impart the controlled mechanical oscillation to a solid or viscoelastic liquid, and to measure in-phase and out-of-phase response of the specimen. One calculates the storage modulus (E ) from the in-phase and the loss modulus (E ) from the out-of-phase response, which represent the energy stored and dissipated, respectively. Tan δ, where δ is the phase angle between the stress and strain in the oscillatory experiment, is given by the ratio of energy dissipated to energy stored per cycle (E /E ).From the analysis of the dynamic mechanical parameters, useful information on material properties can be obtained such as bulk properties directly related to material performance and primary and secondary transitions not easily identified by other methods. Typically, the information concerning polymeric systems from DMA includes quantitative modulus, glass transitions, rate and extent of polymerization, quantification of gelation, degree of cross-linking, and changes in polymer chain mobility. Among the dynamic mechanical properties in dental polymeric materials, the E as a parameter of materials stiffness and the gla...

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Section: -4530mentioning

confidence: 99%

Characterization of some proprietary soft lining materials

Kalachandra

Minton

Taylor

et al. 1995

J Mater Sci: Mater Med

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The physical and mechanical properties of a series of commercial denture soft lining materials have been investigated. The materials were selected to provide a representative sample of the materials widely used for this application. A total of seven products were evaluated including established and widely used acrylic and silicone materials as well as newer polyphosphazine and fluoroelastomer materials. The objective of the study was to determine minimally acceptable and desirable levels for each property which could be used as criteria or standards for the selection of proposed new materials. The results identified several areas requiring attention and future work. In particular, the importance of using fully-water-equilibrated specimens was emphasized for acrylic polymers where large property changes occurred between wet and dry conditions, and in the case of the polyphosphazine materials where the long time required for full equilibration may lead to underestimates of the changes involved. Based upon the properties as measured, recommendations for appropriate standard level for each property are offered.

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Characterization of commercial soft liners by dynamic mechanical analysis

Cited by 14 publications

References 18 publications

Silica-filled elastomer/methacrylate systems as soft liners

Silica-filled elastomer/methacrylate systems as soft liners

Dynamic Mechanical Properties of a Visible Light Curable Urethane Dimethacrylate Based Dental Resin

Characterization of some proprietary soft lining materials

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