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BONDING TO UNCONVENTIONAL SURFACES

  • WOOD et al (1986)
  • Bond strength equal/greater than to enamel surface with this technique
  • Damage to porcelain surface
  • ZACHRISSON et al (1993)
  • Unacceptably high failure rates
  • Lab tests – high bond strength
  • In vitro – continuously increasing force
  • In vivo – traumatic incidents, repeated stress – propagation of micro cracks
  • Old composites –
  • Decrease in free MMA groups
  • Exposed filler particles from silane leached out
  • Superficial layer abraded with diamond or carbide bur
  • 37% phosphoric acid
  • Silanation
  • Bonding

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