Polymerization stress, shrinkage and elastic modulus of current low-shrinkage restorative composites

Letícia Cristina Cidreira Boaro, Flávia Gonalves, Thayse Costa Guimarães, Jack Ferracane, Antheunis Versluis, Roberto Ruggiero Braga

Research output: Contribution to journalArticle

134 Citations (Scopus)

Abstract

Objective: To compare currently available low-shrinkage composites with others regarding polymerization stress, volumetric shrinkage (total and post-gel), shrinkage rate and elastic modulus. Methods: Seven BisGMA-based composites (Durafill/DU, Filtek Z250/FZ, Heliomolar/HM, Aelite LS Posterior/AP, Point 4/P4, Filtek Supreme/SU, ELS/EL), a silorane-based (Filtek LS, LS), a urethane-based (Venus Diamond, VD) and one based on a dimethacrylate-derivative of dimer acid (N′Durance, ND) were tested. Polymerization stress was determined in 1-mm high specimens inserted between two PMMA rods attached to a universal testing machine. Total volumetric shrinkage was measured using a mercury dilatometer. Maximum shrinkage rate was used as a parameter of the reaction speed. Post-gel shrinkage was measured using strain-gages. Elastic modulus was obtained by three-point bending. Data were submitted to one-way ANOVA/Tukey test (p = 0.05), except for elastic modulus (Kruskal-Wallis). Results: Composites ranked differently for total and post-gel shrinkage. Among the materials considered as "low-shrinkage" by the respective manufacturers, LS, EL and VD presented low post-gel shrinkage, while AP and ND presented relatively high values. Polymerization stress showed a strong correlation with post-gel shrinkage except for LS, which presented high stress. Elastic modulus and shrinkage rate showed weak relationships with polymerization stress. Significance: Not all low-shrinkage composites demonstrated reduced polymerization shrinkage. Also, in order to effectively reduce polymerization stress, a low post-gel shrinkage must be associated to a relatively low elastic modulus.

Original languageEnglish (US)
Pages (from-to)1144-1150
Number of pages7
JournalDental Materials
Volume26
Issue number12
DOIs
StatePublished - Dec 2010

Fingerprint

Elastic Modulus
Polymerization
Elastic moduli
Gels
Composite materials
Venus
Diamond
Urethane
Polymethyl Methacrylate
Mercury
Analysis of Variance
Silorane Resins
Diamonds
Acids
Dilatometers
Analysis of variance (ANOVA)
Strain gages
Dimers

Keywords

  • Elastic modulus
  • Low-shrinkage composites
  • Polymerization stress
  • Shrinkage

ASJC Scopus subject areas

  • Dentistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Medicine(all)

Cite this

Polymerization stress, shrinkage and elastic modulus of current low-shrinkage restorative composites. / Boaro, Letícia Cristina Cidreira; Gonalves, Flávia; Guimarães, Thayse Costa; Ferracane, Jack; Versluis, Antheunis; Braga, Roberto Ruggiero.

In: Dental Materials, Vol. 26, No. 12, 12.2010, p. 1144-1150.

Research output: Contribution to journalArticle

Boaro, Letícia Cristina Cidreira ; Gonalves, Flávia ; Guimarães, Thayse Costa ; Ferracane, Jack ; Versluis, Antheunis ; Braga, Roberto Ruggiero. / Polymerization stress, shrinkage and elastic modulus of current low-shrinkage restorative composites. In: Dental Materials. 2010 ; Vol. 26, No. 12. pp. 1144-1150.
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AU - Boaro, Letícia Cristina Cidreira

AU - Gonalves, Flávia

AU - Guimarães, Thayse Costa

AU - Ferracane, Jack

AU - Versluis, Antheunis

AU - Braga, Roberto Ruggiero

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AB - Objective: To compare currently available low-shrinkage composites with others regarding polymerization stress, volumetric shrinkage (total and post-gel), shrinkage rate and elastic modulus. Methods: Seven BisGMA-based composites (Durafill/DU, Filtek Z250/FZ, Heliomolar/HM, Aelite LS Posterior/AP, Point 4/P4, Filtek Supreme/SU, ELS/EL), a silorane-based (Filtek LS, LS), a urethane-based (Venus Diamond, VD) and one based on a dimethacrylate-derivative of dimer acid (N′Durance, ND) were tested. Polymerization stress was determined in 1-mm high specimens inserted between two PMMA rods attached to a universal testing machine. Total volumetric shrinkage was measured using a mercury dilatometer. Maximum shrinkage rate was used as a parameter of the reaction speed. Post-gel shrinkage was measured using strain-gages. Elastic modulus was obtained by three-point bending. Data were submitted to one-way ANOVA/Tukey test (p = 0.05), except for elastic modulus (Kruskal-Wallis). Results: Composites ranked differently for total and post-gel shrinkage. Among the materials considered as "low-shrinkage" by the respective manufacturers, LS, EL and VD presented low post-gel shrinkage, while AP and ND presented relatively high values. Polymerization stress showed a strong correlation with post-gel shrinkage except for LS, which presented high stress. Elastic modulus and shrinkage rate showed weak relationships with polymerization stress. Significance: Not all low-shrinkage composites demonstrated reduced polymerization shrinkage. Also, in order to effectively reduce polymerization stress, a low post-gel shrinkage must be associated to a relatively low elastic modulus.

KW - Elastic modulus

KW - Low-shrinkage composites

KW - Polymerization stress

KW - Shrinkage

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