Warning: mkdir(): Permission denied in /home/virtual/lib/view_data.php on line 81

Warning: fopen(upload/ip_log/ip_log_2024-12.txt): failed to open stream: No such file or directory in /home/virtual/lib/view_data.php on line 83

Warning: fwrite() expects parameter 1 to be resource, boolean given in /home/virtual/lib/view_data.php on line 84
Slumping resistance and viscoelasticity of resin composite pastes
Skip Navigation
Skip to contents

Restor Dent Endod : Restorative Dentistry & Endodontics

Search
Advanced Search
OPEN ACCESS
mobile search button mobile menu button

Articles

Page Path
HOME > Restor Dent Endod > Volume 33(3); 2008 > Article
Original Article Slumping resistance and viscoelasticity of resin composite pastes
Hee Yeon Suh, In Bog Lee
Journal of Korean Academy of Conservative Dentistry 2008;33(3):235-245.
DOI: https://doi.org/10.5395/JKACD.2008.33.3.235
Published online: May 31, 2008

Department of Conservative Dentistry, School of Dentistry, Seoul National University, Korea.

Corresponding Author: In Bog Lee. Department of Conservative Dentistry, School of Dentistry, Seoul National University, 275-1 Yeongeon-Dong, Jongno-Gu, Seoul 110-768, Korea. Tel: 82-2-2072-3953, Fax: 82-2-2072-3859, inboglee@snu.ac.kr
• Received: April 3, 2008   • Revised: April 26, 2008   • Accepted: April 29, 2008

Copyright © 2008 The Korean Academy of Conservative Dentistry

  • 15 Views
  • 0 Download
prev next
Full Article

Download PDF Download PDF

  • 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 mm 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 non-slumped 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.
  • Keywords: Slumping resistance; Viscoelasticity; Resin composites; Rheology; Handling characteristics
  • 1. Al-Sharaa KA, Watts DC. Stickiness prior to setting of some light cured resin composites. Dent Mater. 2003;19: 182-187.ArticlePubMed
  • 2. Lee IB, Son HH, Um CM. Rheological properties of flowable, conventional hybrid, and condensable composite resins. Dent Mater. 2003;19: 298-307.PubMed
  • 3. Craig RG, Powers JM. Restorative dental materials. 2002;11th Ed. Mosby Co.; 91-98. 231-251.
  • 4. Bayne SC, Thompson JY, Swift EJ, Stamatiades P, Wilkerson M. A characterization of first-generation flowable composites. J Am Dent Assoc. 1998;129: 567-577.PubMed
  • 5. Leinfelder KF, Bayne SC, Swift EJ. Packable composites: overview and technical considerations. J Esthet Dent. 1999;11: 234-249.ArticlePubMed
  • 6. Opdam NJM, Roeters JJM, Peters TCRB, Burgersdijk RCW, Kuijs RH. Consistency of resin composites for posterior use. Dent Mater. 1996;12: 350-354.ArticlePubMed
  • 7. Lee IB, Cho BH, Son HH, Um CM. The effect of consistency, specimen geometry and adhesion on the linear polymerization shrinkage measurement of light cured composites. Dent Mater. 2006;22: 1071-1079.PubMed
  • 8. Tyas MJ, Jones DW, Rizkalla AS. The evaluation of resin composite consistency. Dent Mater. 1998;14: 424-428.PubMed
  • 9. Barnes HA, Hutton JF, Walters K. An introduction to rheology. 1989;1st edi. Elsevier Science Publishing Co; 64-73.
  • 10. Rheology and its application. 2001;1st edi. The Korean society of rheology; 3-103. 175-191.
  • 11. Summitt JB, Robbins JW, Hilton TJ, Schwartz RS. Fundamentals of operative dentistry: A contemporary approach. 2006;3rd Ed. Quintessence books; 319-323.
  • 12. Jackson RD, Morgam M. The new posterior resins and a simplified placement technique. JADA. 2000;131: 375-383.PubMed
  • 13. Lee JH, Um CM, Lee IB. Rheological properties of resin composites according to variations in monomer and filler composition. Dent Mater. 2006;22(6):515-526.ArticlePubMed
  • 14. Kim SW, Kim OY, Jang JS. Rheological properties of fumed silica filled Bis-GMA dispersions. Polymer Eng and Sci. 1998;38: 1142-1148.Article
  • 15. Leinfelder KF, Radz GM, Nash RW. A report on a new condensable composite resin. Compendium. 1998;19(3):230-237.PubMed
  • 16. Lee IB, Cho BH, Son HH, Um CM. Rheological characterization of composites using a vertical oscillation rheometer. Dent Mater. 2006;23: 425-432.ArticlePubMed
  • 17. Lee I, Chang J, Ferracane J. Slumping resistance and viscoelasticity prior to setting of dental composites. Dent Mater. 2008;in press.ArticlePubMed
Figure 1
(a) Dimension of the aluminum mold used to imprint on composite discs.
(b) The procedure to make an imprint on a composite disc with the aluminum mold.
jkacd-33-235-g001.jpg
Figure 2
(a) The laser 3D profilometer used to scan the surface profiles of the replica stone casts of composite discs before and after slumped.
(b) 3D profiles of before and after slumped of composite discs of Z100 at 25℃.
jkacd-33-235-g002.jpg
Figure 3
Representative line profiles of before and after slumped of composite discs of Z100 at 25℃.
(a) Initial surface topography of Z100 right after imprinted with a square shaped mold.
(b) Post slumped surface topography of Z100 after three minutes.
The slumping resistance index (SRI) was defined as Hs-LsHi-Lijkacd-33-235-i004.jpg (Hi, Li: before slumping heights of the highest and lowest point from the base line respectively; Hs, Ls: after-slumping heights of the highest and lowest point from the base line respectively).
jkacd-33-235-g003.jpg
Figure 4
The flow tester.
jkacd-33-235-g004.jpg
Figure 5
Slumping resistance index (SRI) of composites imprinted with square shaped molds.
jkacd-33-235-g005.jpg
Figure 6
Rheological characteristics of composites as a function of strain at 25℃. (a) Elastic (storage) shear modulus G" (b) Viscous (loss) shear modulus G" (c) Loss tangent, tan δ
jkacd-33-235-g006.jpg
Figure 7
Logarithmic regression curve, y=aln(x-xo), fitted on the SRI of the composites as a function of viscous (loss) shear modulus G"
jkacd-33-235-g007.jpg
Table 1
The resin composites used in this study

Z350 is the same as Filtek Supreme (body) as sold in the US market.

jkacd-33-235-i001.jpg
Table 2
a) The elastic (storage) shear modulus G', viscous (loss) shear modulus G", loss tangent Tan δ, and complex viscosity η* of composites at the frequency of 1Hz, strain of 0.08 in the strain sweep test at 25℃
b) Normal stresses measured by squeeze test, spreaded diameter measured by flow test and SRI at 25℃
jkacd-33-235-i002.jpg
Table 3
Correlation analysis between the various rheological variables and the SRI
jkacd-33-235-i003.jpg

Tables & Figures

REFERENCES

    Citations

    Citations to this article as recorded by  

      • ePub LinkePub Link
      • Cite
        CITE
        export Copy Download
        Close
        Download Citation
        Download a citation file in RIS format that can be imported by all major citation management software, including EndNote, ProCite, RefWorks, and Reference Manager.
        Format:
        • RIS — For EndNote, ProCite, RefWorks, and most other reference management software
        • BibTeX — For JabRef, BibDesk, and other BibTeX-specific software
        Include:
        • Citation for the content below
        Slumping resistance and viscoelasticity of resin composite pastes
        J Korean Acad Conserv Dent. 2008;33(3):235-245.   Published online May 31, 2008
        DOI: https://doi.org/10.5395/JKACD.2008.33.3.235
        Close
      • XML DownloadXML Download
      Figure
      • 0
      • 1
      • 2
      • 3
      • 4
      • 5
      • 6
      Related articles
      Slumping resistance and viscoelasticity of resin composite pastes
      Image Image Image Image Image Image Image
      Figure 1 (a) Dimension of the aluminum mold used to imprint on composite discs. (b) The procedure to make an imprint on a composite disc with the aluminum mold.
      Figure 2 (a) The laser 3D profilometer used to scan the surface profiles of the replica stone casts of composite discs before and after slumped. (b) 3D profiles of before and after slumped of composite discs of Z100 at 25℃.
      Figure 3 Representative line profiles of before and after slumped of composite discs of Z100 at 25℃. (a) Initial surface topography of Z100 right after imprinted with a square shaped mold. (b) Post slumped surface topography of Z100 after three minutes. The slumping resistance index (SRI) was defined as Hs-LsHi-Li (Hi, Li: before slumping heights of the highest and lowest point from the base line respectively; Hs, Ls: after-slumping heights of the highest and lowest point from the base line respectively).
      Figure 4 The flow tester.
      Figure 5 Slumping resistance index (SRI) of composites imprinted with square shaped molds.
      Figure 6 Rheological characteristics of composites as a function of strain at 25℃. (a) Elastic (storage) shear modulus G" (b) Viscous (loss) shear modulus G" (c) Loss tangent, tan δ
      Figure 7 Logarithmic regression curve, y=aln(x-xo), fitted on the SRI of the composites as a function of viscous (loss) shear modulus G"

      Figure 1

      Figure 2

      Figure 3

      Figure 4

      Figure 5

      Figure 6

      Figure 7

      Slumping resistance and viscoelasticity of resin composite pastes

      The resin composites used in this study

      Z350 is the same as Filtek Supreme (body) as sold in the US market.

      a) The elastic (storage) shear modulus G', viscous (loss) shear modulus G", loss tangent Tan δ, and complex viscosity η* of composites at the frequency of 1Hz, strain of 0.08 in the strain sweep test at 25℃

      b) Normal stresses measured by squeeze test, spreaded diameter measured by flow test and SRI at 25℃

      Correlation analysis between the various rheological variables and the SRI
      Table 1 The resin composites used in this study

      Z350 is the same as Filtek Supreme (body) as sold in the US market.

      Table 2 a) The elastic (storage) shear modulus G', viscous (loss) shear modulus G", loss tangent Tan δ, and complex viscosity η* of composites at the frequency of 1Hz, strain of 0.08 in the strain sweep test at 25℃ b) Normal stresses measured by squeeze test, spreaded diameter measured by flow test and SRI at 25℃

      Table 3 Correlation analysis between the various rheological variables and the SRI

      Table 1

      Table 2

      Table 3

      Restor Dent Endod : Restorative Dentistry & Endodontics
      © The Korean Academy of Conservative Dentistry.
      Close layer
      TOP