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Restorative Dentistry

Video Presentation: How does resin chemistry and composite formulation affect the photocuring process?

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This short video (7:15) is presented by Dr. Jeff Stansbury. The video discusses how resin chemistry and composite formulation affect the photocuring process 

Dr. Jeffrey Stansbury is Professor of Restorative Dentistry, Professor of Chemical and Biological Engineering, and Director of the Biomaterials Research Center at the University of Colorado 

Composite Photopolymerization

  • Adding filler reduces the resin phase and reduces potential reaction exotherm
  • Filler dramatically affects light transport
  • Light reflection, scattering and absorption lead to significant attenuation
  • Extend path length
  • Absorb light energy to provide heating effects as well as a heat sink that retains elevated temperatures
  • Effective cure temperature and the reaction rate affect the final conversion
  • Polymer properties, such as refractive index, change considerably during polymerization with an effect on the photocuring process

Resin Composition Photopolymerization

  • Different monomers have inherently different polymerization rates
  • Copolymerization can be synergistic with an optimum initial viscosity that facilitates autoacceleration

Watch the Video 

 

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