denture repairs

  1. Self Cure Acrylic Resins
    • chemically activated
    • usually a tertiary amine i.e. dimethyl-p-toluidine
    • *color instability: oxidation of tertiary amine
    • c)  the activator is added to the monomer to
    • activate the benzoyl peroxide in the polymer
    •   *polymerization is an exothermic reaction
    • d)  not possible to obtain as great a degree of polymerization as in the heat cure due to residual 3-5% monomer remaining in the  autopolymerizing resins
    • e)  strength 50-70% that of heat polymerized acrylic resins
    • f)  utilized for denture relines and repairs
    •        -less volume, less heat, less distortion
    • g)  for better color match use-
    • heat cure polymer (pigment)
    • and cold cure monomer
  2. plastic teeth
    • tough
    • low abrasion resistance (soft)
    • good bond to base
    • silent function
    • easy grinding polishing
  3. porcelain
    • brittle, low toughness
    • high abrasion resistance
    • poor retention needs silane, mechanical
    • clicking function sounds
    • grinding removes glaze
  4. diatoric chamber
    mechanical retention tooth repairs
  5. Anterior tooth problem areas:
    • failure to duplicate tooth position
    • permitting resin surface to dry thus producing porosity
    • -keep wet with monomer and polymerize under pressure
    • allowing monomer on polished surface
    • repair resin on polished surface
  6. Posterior Tooth- Problems
    • a) tooth not in proper occlusion
    • b) need to mount prior to replacement
    • c) occlusion must be adjusted after repair
    • d) repair resin on polished surface
    • e) porous resin repair
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denture repairs
dentures repairs