Flexural creep deformation and recovery in dental composites

Vaidyanathan, J.; Vaidyanathan, T.K.

doi:10.1016/s0300-5712(01)00049-5

Cited by 73 publications

(40 citation statements)

References 14 publications

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“…Viscoelastic behavior of the material is another important factor that affects the polymerization stress development [5]. The viscoelasticity of the material and the volumetric shrinkage are both controlled by similar factors that make it difficult to isolate their effect on the polymerization shrinkage stress development [13,14]. In addition, the stress development is affected by the reaction kinetics as a higher polymerization rate is accompanied by high polymerization stress [15,16].…”

Section: Introductionmentioning

confidence: 99%

Polymerization shrinkage kinetics and shrinkage-stress in dental resin-composites

2016

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Shrinkage-strainShrinkage-stress Strain rate Modulus of elasticity Bulk-fill a b s t r a c tObjectives. To investigate a set of resin-composites and the effect of their composition on polymerization shrinkage strain and strain kinetics, shrinkage stress and the apparent elastic modulus.Methods. Eighteen commercially available resin-composites were investigated. Three specimens (n = 3) were made per material and light-cured with an LED unit (1200 mW/cm 2 ) for 20 s. The bonded-disk method was used to measure the shrinkage strain and Bioman shrinkage stress instrument was used to measure shrinkage stress. The shrinkage strain kinetics at 23 • C was monitored for 60 min. Maximum strain and stress was evaluated at 60 min. The shrinkage strain rate was calculated using numerical differentiation. Significance. The nature of the monomer system determines the amount of the bulk contraction that occurs during polymerization and the resultant stress. Higher values of shrinkage strain and stress were demonstrated by the investigated flowable materials. The bulk-fill materials showed comparable result when compared to the traditional resin-composites.

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Section: Introductionmentioning

confidence: 99%

Polymerization shrinkage kinetics and shrinkage-stress in dental resin-composites

2016

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“…The creep-recovery profiles of the resin composites investigated in this study followed the typical stages of deformation and recovery generally observed for polymeric materials 24) . Therefore, the time-dependent creep deformation and recovery measurement method used in this study provided an insight not only into the material's ability to resist stresses without catastrophic failure, but also how stresses were accommodated by compliance through viscoelastic behavior and viscous fluidity when under constant dynamic loading, and the degree to which the material would relax towards its original configuration when the load was removed 25,26) .…”

Section: Discussionmentioning

confidence: 56%

“…1) and subjected to a constant stress of 20 MPa for 2 h, followed by 2 h of strain recovery after load removal. During the entire loading and unloading time, applied load was monitored and deformation was measured as per described in previous studies [24][25][26] . For the dynamic creep test, a universal testing machine (Z020, Zwick/Roell GmbH & Co. KG, Ulm, Germany) was used.…”

Section: Static and Dynamic Creep Testsmentioning

confidence: 99%

Creep of experimental short fiber-reinforced composite resin

et al. 2012

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The purpose of this study was to investigate the reinforcing effect of short E-glass fiber fillers oriented in different directions on composite resin under static and dynamic loading. Experimental short fiber-reinforced composite resin (FC) was prepared by mixing 22.5 wt% of short E-glass fibers, 22.5 wt% of resin, and 55 wt% of silane-treated silica fillers. Three groups of specimens (n=5) were tested: FC with isotropic fiber orientation, FC with anisotropic fiber orientation, and particulate-filled composite resin (PFC) as a control. Time-dependent creep and recovery were recorded. ANOVA revealed that after secondary curing in a vacuum oven and after storage in dry condition for 30 days, FC with isotropic fiber orientation (1.73%) exhibited significantly lower static creep value (p<0.05) than PFC (2.54%). For the different curing methods and storage conditions evaluated in this study, FC achieved acceptable static and dynamic creep values when compared to PFC.

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“…Moreover, CM was the only material to exhibit full recovery in the two highest torques used. Creep has been found to be influenced by filler content 25) and an inverse relationship between creep compliance and filler loading was shown 26) explaining the behavior of this heavily-filled material.…”

Section: Discussionmentioning

confidence: 98%

Viscoelastic properties of low-shrinking composite resins compared to packable composite resins

et al. 2011

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The aim of this study was to evaluate the viscoelastic properties of novel low-shrinking composites and compare them to those of packable composites. Six materials were tested: Clearfil Majesty Posterior (CM), ELS Extra Low Shrinkage (EL), Filtek P60 (FP), Filtek Silorane (FS), Prodigy (PR) and Surefil (SU). Static and dynamic testing was performed and materials were tested dry and wet at different temperatures (21°C to 50°C). Shear and flexural modulus, loss tangent, dynamic viscosity, Poisson's ratio and creep recovery were calculated among others. Significant differences were found both between the two groups and between materials belonging to the same group. CM presented the highest shear and flexural modulus and EL the lowest. All materials were softened by an increase of temperature, while FS was the least affected by water and PR showed to be the most susceptible. Different approaches used to overcome polymerization shrinkage lead to materials with different properties.

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Flexural creep deformation and recovery in dental composites

Cited by 73 publications

References 14 publications

Polymerization shrinkage kinetics and shrinkage-stress in dental resin-composites

Polymerization shrinkage kinetics and shrinkage-stress in dental resin-composites

Creep of experimental short fiber-reinforced composite resin

Viscoelastic properties of low-shrinking composite resins compared to packable composite resins

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