The influence of shrinkage and moisture diffusion on idealized tooth structure involving debonding damage

Jianping Fan, Chak Yin Tang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)


This study highlights the joint effect of early polymerization shrinkage and long-term moisture diffusion on the behavior of the restoration-tooth structure. The interphase debonding between particle and polymer resin in dental composite is taken into account by introducing the damage variable. The idealized model is designed and constructed for representing the restoration-tooth structure, which consists of enamel, dentin, composite and interphase, each considered as homogenous material. The simulation is carried out using the general-purpose finite element software package, ABAQUS incorporated with a user subroutine for definition of damaged material behavior. The influence of Young's moduli of composite and interphase on stress and displacement is discussed. The compensating effect of water sorption on the polymerization shrinkage is examined with and without involving damage evolution. A comparison is made between the influence of hyper-, equi- and hypo-water sorption. Interfacial failure in the specific regions as well as cuspal movement has been predicated. The damage evolving in dental composite reduces the rigidity of composite, thus in turn reducing consequent stress and increasing consequent displacement. The development of stresses at the restoration-tooth interface can have a detrimental effect on the longevity of a restoration.
Original languageEnglish
Pages (from-to)110-112
Number of pages3
JournalActa Mechanica Solida Sinica
Issue number2
Publication statusPublished - 1 Jun 2005


  • Dental composite
  • Displacement distribution
  • Finite element method
  • Polymerization shrinkage
  • Restoration-tooth structure
  • Stress distribution
  • Water sorption

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Computational Mechanics


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