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STRESSES IN ADHESIVE RESTORATIONS

  • Basic polymer chemistry
  •     The fundamentals of polymerization
  •      Reaction kinetics in photopolymerised networks
  •      The effects of polymerization shrinkage
  •      Factors influencing shrinkage and stress
  •      Measurement of shrinkage and stress
  •      Counteracting polymerization shrinkage and stress
  •      Conclusion

 

  • Gel point – formation of a continuous network structure  – conversion dependent
  • Visco elastic flow
  • Auto acceleration : viscosity – macroradical termination – inhibition of monomer mobility
  • Vitrefication stage : glass transition temperature reaches cure temperature
  • Residual unsaturation : mixture of pendant reactive groups and free monomers

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