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Bonded amalgam

Bonded amalgam. Tim WH Yuen BDSc(WA) MDSc(Melb) FRACDS. Why bond amalgam:. Additional retention Less potential of pulpal/periodontal trauma? compared to using pins Strengthen/Reinforcement of weak tooth structure Longevity compared to composite Minimizes microleakege

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Bonded amalgam

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  1. Bonded amalgam Tim WH Yuen BDSc(WA) MDSc(Melb) FRACDS

  2. Why bond amalgam: • Additional retention • Less potential of pulpal/periodontal trauma? compared to using pins • Strengthen/Reinforcement of weak tooth structure • Longevity compared to composite • Minimizes microleakege • Reduces post-operative sensitivity? • Bonding to old amalgam/repairs

  3. Nature of bonded amalgams • Interphases to consider: • Tooth – resin ( hybrid layer) • Resin- alloy ( micromechanical bond) • Essentially the intermingling of the two materials (resin-alloy particles) form a micromechanical bond. • The strongest bond is at the tooth-resin interphase.

  4. Amalgam bonding agents • 4-methyloxy ethyl trimellitic anhydride ( 4-META) “Amalgambond” or • Panavia F ( dual cure) or Panavia 21 ( self cure). Contains adhesive MDP monomer ( 10 – Methacryloxyecyl) which allows it to bond to non precious metals but with noble alloys, tin plating is necessary

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