Understanding contradictory data in contraction stress tests

J. B C Meira, R. R. Braga, R. Y. Ballester, C. B. Tanaka, Antheunis Versluis

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The literature shows contradictory results regarding the role of composite shrinkage and elastic modulus as determinants of polymerization stress. The present study aimed at a better understanding of the test mechanics that could explain such divergences among studies. The hypothesis was that the effects of composite shrinkage and elastic modulus on stress depend upon the compliance of the testing system. A commonly used test apparatus was simulated by finite element analysis, with different compliance levels defined by the bonding substrate (steel, glass, composite, or acrylic). Composites with moduli between 1 and 12 GPa and shrinkage values between 0.5% and 6% were modeled. Shrinkage was simulated by thermal analogy. The hypothesis was confirmed. When shrinkage and modulus increased simultaneously, stress increased regardless of the substrate. However, if shrinkage and modulus were inversely related, their magnitudes and interaction with rod material determined the stress response.

Original languageEnglish (US)
Pages (from-to)365-370
Number of pages6
JournalJournal of Dental Research
Volume90
Issue number3
DOIs
StatePublished - Mar 1 2011

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Elastic Modulus
Exercise Test
Finite Element Analysis
Steel
Mechanics
Polymerization
Compliance
Glass
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Dentistry(all)

Cite this

Understanding contradictory data in contraction stress tests. / Meira, J. B C; Braga, R. R.; Ballester, R. Y.; Tanaka, C. B.; Versluis, Antheunis.

In: Journal of Dental Research, Vol. 90, No. 3, 01.03.2011, p. 365-370.

Research output: Contribution to journalArticle

Meira, J. B C ; Braga, R. R. ; Ballester, R. Y. ; Tanaka, C. B. ; Versluis, Antheunis. / Understanding contradictory data in contraction stress tests. In: Journal of Dental Research. 2011 ; Vol. 90, No. 3. pp. 365-370.
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