Polymerization stress of resin composites as a function of system compliance

Flavia Gonçalves; Carmem S.C. Pfeifer; Josete B.C. Meira; Rafael Y. Ballester; Raul G. Lima; Roberto R. Braga

doi:10.1016/j.dental.2007.06.032

Polymerization stress of resin composites as a function of system compliance

Flavia Gonçalves, Carmem S.C. Pfeifer, Josete B.C. Meira, Rafael Y. Ballester, Raul G. Lima, Roberto R. Braga

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

Objectives: Evaluate the effect of testing system compliance on polymerization stress and stress distribution of composites. Methods: Composites tested were Filtek Z250 (FZ), Herculite (HL), Tetric Ceram (TC), Helio Fill-AP (HF) and Heliomolar (HM). Stress was determined in 1-mm thick specimens, inserted between two rods of either poly(methyl methacrylate), PMMA, or glass. Experimental nominal stress (σ_exp) was calculated by dividing the maximum force recorded 5 min after photoactivation by the cross-sectional area of the rod. Composites' elastic modulus (E) was obtained by three-point bending. Data were submitted to one-way ANOVA/Tukey's test (α = 0.05). Stress distribution on longitudinal (σ_y) and transverse (σ_x) axes of models representing the composites with the highest and lowest E (FZ and HM, respectively) were evaluated by finite element analysis (FEA). Results: σ_exp ranged from 5.5 to 8.8 MPa in glass and from 2.6 to 3.4 MPa in PMMA. Composite ranking was not identical in both substrates, since FZ showed σ_exp statistically higher than HM in glass, while in PMMA FZ showed values similar to the other composites. A strong correlation was found between stress reduction (%) from glass to PMMA and composite's E (r² = 0.946). FEA revealed that system compliance was influenced by the composite (FZ led to higher compliance than HM). σ_x distribution was similar in both substrates, while σ_y distribution showed larger areas of compressive stresses in specimens built on PMMA. Significance: σ_exp determined in PMMA was 53-68% lower than in glass. Composite ranking varied slightly due to differences in substrates' longitudinal and transverse deformation.

Original language	English (US)
Pages (from-to)	645-652
Number of pages	8
Journal	Dental Materials
Volume	24
Issue number	5
DOIs	https://doi.org/10.1016/j.dental.2007.06.032
State	Published - May 2008
Externally published	Yes

Keywords

Finite element analysis
Polymerization stress
Resin composite
Three-point bending

ASJC Scopus subject areas

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

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10.1016/j.dental.2007.06.032

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title = "Polymerization stress of resin composites as a function of system compliance",

abstract = "Objectives: Evaluate the effect of testing system compliance on polymerization stress and stress distribution of composites. Methods: Composites tested were Filtek Z250 (FZ), Herculite (HL), Tetric Ceram (TC), Helio Fill-AP (HF) and Heliomolar (HM). Stress was determined in 1-mm thick specimens, inserted between two rods of either poly(methyl methacrylate), PMMA, or glass. Experimental nominal stress (σexp) was calculated by dividing the maximum force recorded 5 min after photoactivation by the cross-sectional area of the rod. Composites' elastic modulus (E) was obtained by three-point bending. Data were submitted to one-way ANOVA/Tukey's test (α = 0.05). Stress distribution on longitudinal (σy) and transverse (σx) axes of models representing the composites with the highest and lowest E (FZ and HM, respectively) were evaluated by finite element analysis (FEA). Results: σexp ranged from 5.5 to 8.8 MPa in glass and from 2.6 to 3.4 MPa in PMMA. Composite ranking was not identical in both substrates, since FZ showed σexp statistically higher than HM in glass, while in PMMA FZ showed values similar to the other composites. A strong correlation was found between stress reduction (%) from glass to PMMA and composite's E (r2 = 0.946). FEA revealed that system compliance was influenced by the composite (FZ led to higher compliance than HM). σx distribution was similar in both substrates, while σy distribution showed larger areas of compressive stresses in specimens built on PMMA. Significance: σexp determined in PMMA was 53-68% lower than in glass. Composite ranking varied slightly due to differences in substrates' longitudinal and transverse deformation.",

keywords = "Finite element analysis, Polymerization stress, Resin composite, Three-point bending",

author = "Flavia Gon{\c c}alves and Pfeifer, {Carmem S.C.} and Meira, {Josete B.C.} and Ballester, {Rafael Y.} and Lima, {Raul G.} and Braga, {Roberto R.}",

note = "Funding Information: The authors would like to thank Jack Ferracane (Oregon Health and Science University, USA) for the use of the mercury dilatometer. This study was supported by CNPq. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2008",

month = may,

doi = "10.1016/j.dental.2007.06.032",

language = "English (US)",

volume = "24",

pages = "645--652",

journal = "Dental Materials",

issn = "0109-5641",

publisher = "Elsevier Science",

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T1 - Polymerization stress of resin composites as a function of system compliance

AU - Gonçalves, Flavia

AU - Pfeifer, Carmem S.C.

AU - Meira, Josete B.C.

AU - Ballester, Rafael Y.

AU - Lima, Raul G.

AU - Braga, Roberto R.

N1 - Funding Information: The authors would like to thank Jack Ferracane (Oregon Health and Science University, USA) for the use of the mercury dilatometer. This study was supported by CNPq. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2008/5

Y1 - 2008/5

N2 - Objectives: Evaluate the effect of testing system compliance on polymerization stress and stress distribution of composites. Methods: Composites tested were Filtek Z250 (FZ), Herculite (HL), Tetric Ceram (TC), Helio Fill-AP (HF) and Heliomolar (HM). Stress was determined in 1-mm thick specimens, inserted between two rods of either poly(methyl methacrylate), PMMA, or glass. Experimental nominal stress (σexp) was calculated by dividing the maximum force recorded 5 min after photoactivation by the cross-sectional area of the rod. Composites' elastic modulus (E) was obtained by three-point bending. Data were submitted to one-way ANOVA/Tukey's test (α = 0.05). Stress distribution on longitudinal (σy) and transverse (σx) axes of models representing the composites with the highest and lowest E (FZ and HM, respectively) were evaluated by finite element analysis (FEA). Results: σexp ranged from 5.5 to 8.8 MPa in glass and from 2.6 to 3.4 MPa in PMMA. Composite ranking was not identical in both substrates, since FZ showed σexp statistically higher than HM in glass, while in PMMA FZ showed values similar to the other composites. A strong correlation was found between stress reduction (%) from glass to PMMA and composite's E (r2 = 0.946). FEA revealed that system compliance was influenced by the composite (FZ led to higher compliance than HM). σx distribution was similar in both substrates, while σy distribution showed larger areas of compressive stresses in specimens built on PMMA. Significance: σexp determined in PMMA was 53-68% lower than in glass. Composite ranking varied slightly due to differences in substrates' longitudinal and transverse deformation.

AB - Objectives: Evaluate the effect of testing system compliance on polymerization stress and stress distribution of composites. Methods: Composites tested were Filtek Z250 (FZ), Herculite (HL), Tetric Ceram (TC), Helio Fill-AP (HF) and Heliomolar (HM). Stress was determined in 1-mm thick specimens, inserted between two rods of either poly(methyl methacrylate), PMMA, or glass. Experimental nominal stress (σexp) was calculated by dividing the maximum force recorded 5 min after photoactivation by the cross-sectional area of the rod. Composites' elastic modulus (E) was obtained by three-point bending. Data were submitted to one-way ANOVA/Tukey's test (α = 0.05). Stress distribution on longitudinal (σy) and transverse (σx) axes of models representing the composites with the highest and lowest E (FZ and HM, respectively) were evaluated by finite element analysis (FEA). Results: σexp ranged from 5.5 to 8.8 MPa in glass and from 2.6 to 3.4 MPa in PMMA. Composite ranking was not identical in both substrates, since FZ showed σexp statistically higher than HM in glass, while in PMMA FZ showed values similar to the other composites. A strong correlation was found between stress reduction (%) from glass to PMMA and composite's E (r2 = 0.946). FEA revealed that system compliance was influenced by the composite (FZ led to higher compliance than HM). σx distribution was similar in both substrates, while σy distribution showed larger areas of compressive stresses in specimens built on PMMA. Significance: σexp determined in PMMA was 53-68% lower than in glass. Composite ranking varied slightly due to differences in substrates' longitudinal and transverse deformation.

KW - Finite element analysis

KW - Polymerization stress

KW - Resin composite

KW - Three-point bending

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Polymerization stress of resin composites as a function of system compliance

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