-
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
-
plastic teeth
- tough
- low abrasion resistance (soft)
- good bond to base
- silent function
- easy grinding polishing
-
porcelain
- brittle, low toughness
- high abrasion resistance
- poor retention needs silane, mechanical
- clicking function sounds
- grinding removes glaze
-
diatoric chamber
mechanical retention tooth repairs
-
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
-
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
|
|
