Rheological properties of resin composites according to variations in monomer and filler composition

Lee, Jong-Hyuk; Um, Chung-Moon; Lee, In-Bog

doi:10.1016/j.dental.2005.05.008

Cited by 195 publications

(159 citation statements)

References 27 publications

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“…This was so chiefly because nanofilled composites have been shown to be effective in both experimental and clinical situations 24) . It should also be mentioned that Tanimoto et al reported that some properties of composites, such as flexural strength, decreased with increasing filler particle size 25) . On this account, 16-nm-diameter filler was therefore selected, although microfilled and hybrid composites are in mainstream utilization and application today.…”

Section: Discussionmentioning

confidence: 99%

“…One of the reasons why Bis-MPEPP-based mixtures exhibited higher increase rates than did UDMA might arise from the different viscosities of the two base monomers. The intrinsic viscosity of UDMA monomer at 23 was 7.054 Pa s 22) , while that of Bis-MPEPP at 25 was 0.850 Pa s (manufacturer's information). Taylor et al reported that a monomer with low viscosity could accept a large amount of filler and that a sufficiently filled composite showed adequate mechanical properties 21) .…”

Section: Discussionmentioning

confidence: 99%

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Effects of Monomer Composition and Original Filler Content on Filler Loading in the Resulting Centrifuged Composites

et al. 2007

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This study examined the effects of monomer composition, original filler content, and application of centrifugal force on the resulting filler loading of composites. Either Bis-MPEPP or UDMA was mixed with TEGDMA at a molar ratio of 1：1. Silane-treated silica (14 -20 wt％) was added to each mixture. After the mixtures were centrifuged and light-polymerized, rate of increase was determined as the filler increment of 2.0-mm-high, disk-shaped sections of specimen when compared against the uncentrifuged filler content. Both the original filler loading and monomer composition influenced the filler content of the centrifuged composites. Fillers in Bis-MPEPP-based composites exhibited a higher rate of condensation after application of centrifugal force than did UDMA-based composites. The results were suggestive of underlying relationships among the composition, component stability, and post-polymerization properties of flowable composites.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effects of Monomer Composition and Original Filler Content on Filler Loading in the Resulting Centrifuged Composites

et al. 2007

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“…10,13,14) . Filler 함량 증가, filler 표면의 불규칙성 증가, 레진기질에 glass fibers를 함입시켜 복합레진의 점성을 증가시킬 수 있 다 4,5,15) .…”

Section: Flow Testunclassified

Slumping resistance and viscoelasticity of resin composite pastes

Suh

Lee

2008

J Korean Acad Conserv Dent

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The aim of this study was to develop a method for measuring the slumping resistance of resin composites and to relate it to the rheological characteristics.Five commercial hybrid composites (Z100, Z250, DenFil, Tetric Ceram, ClearFil) and a nanofill composite (Z350) were used to make disc-shaped specimens of 2 ㎜ thickness. An aluminum mold with square shaped cutting surface was pressed onto the composite discs to make standardized imprints. The imprints were light-cured either immediately (non-slumped) or after waiting for 3 minutes at 25℃ (slumped). White stone replicas were made and then scanned for topography using a laser 3-D profilometer. Slumping resistance index (SRI) was defined as the ratio of the groove depth of the slumped specimen to that of the nonslumped specimen. The pre-cure viscoelasticity of each composite was evaluated by an oscillatory shear test and normal stress was measured by a squeeze test using a rheometer. Flow test was also performed using a flow tester. Correlation analysis was performed to investigate the relationship between the viscoelastic properties and the SRI.SRI varied between the six materials (Z100 < DenFil < Z250 < ClearFil < Tetric Ceram < Z350). The SRI was strongly correlated with the viscous (loss) shear modulus G´but not with the loss tangent. Also, slumping resistance was more closely related to the resistance to shear flow than to the normal stress.Slumping tendency could be quantified using the imprint method and SRI. The index may be applicable to evaluate the clinical handling characteristics of composites. [J Kor Acad Cons Dent 33(3):235-245, 2008]

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“…전단변형 γ (t)=γ oe Higher aspect ratio means that the material has higher slumping resistance. Flowable 복합레진은 전단률이 증가할수록 점도는 감소 하는 pseudoplastic 경향을 보였고 이는 이전의 연구결과 와 일치하였다 3,8,11,12,15) . [13][14][15][16] .…”

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Slumping tendency and rheological property of flowable composites

Lee

Min

Kim

et al. 2009

J Korean Acad Conserv Dent

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The aim of this study was to develop a method for measuring the slumping resistance of flowable resin composites and to evaluate the efficacy using rheological methodology.Five commercial flowable composites (Aelitefil flow:AF, Filtek flow:FF, DenFil flow:DF, Tetric flow:TF and Revolution:RV) were used. Same volume of composites in a syringe was extruded on a glass slide using a custom-made loading device. The resin composites were allowed to slump for 10 seconds at 25°C and light cured. The aspect ratio (height/diameter) of cone or dome shaped specimen was measured for estimating the slumping tendency of composites. The complex viscosity of each composite was measured by a dynamic oscillatory shear test as a function of angular frequency using a rheometer. To compare the slumping tendency of composites, one way-ANOVA and Turkey's post hoc test was performed for the aspect ratio at 95% confidence level. Regression analysis was performed to investigate the relationship between the complex viscosity and the aspect ratio. The results were as follows.1. Slumping tendency based on the aspect ratio varied among the five materials (AF

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Rheological properties of resin composites according to variations in monomer and filler composition

Cited by 195 publications

References 27 publications

Effects of Monomer Composition and Original Filler Content on Filler Loading in the Resulting Centrifuged Composites

Effects of Monomer Composition and Original Filler Content on Filler Loading in the Resulting Centrifuged Composites

Slumping resistance and viscoelasticity of resin composite pastes

Slumping tendency and rheological property of flowable composites

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