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level: DENTURE BASE

Questions and Answers List

level questions: DENTURE BASE

Question	Answer
DENTURE BASE material	PMMA (Polymethyl Metacrylate)
CHEMICAL COMPOSITION OF DENTURE BASE RESINS (Heat-Activated PMMA): Powder	prepolymerized spheres of PMMA
CHEMICAL COMPOSITION OF DENTURE BASE RESINS (Heat-Activated PMMA): Initiator	benzoyl peroxide (0.5%)
CHEMICAL COMPOSITION OF DENTURE BASE RESINS (Heat-Activated PMMA): Liquid	methyl methacrylate monomer
CHEMICAL COMPOSITION OF DENTURE BASE RESINS (Heat-Activated PMMA): Inhibitor	hydroquinone (traces)
CHEMICAL COMPOSITION OF DENTURE BASE RESINS (Heat-Activated PMMA): Cross-linking agent	ethylene glycol dimethacrylate (NIO%)
CHEMICAL COMPOSITION OF DENTURE BASE RESINS (Heat-Activated PMMA): activator	heat
CHEMICAL COMPOSITION OF DENTURE BASE RESINS (Chemically activated PMMA): Activator	NN-dimethyl-p-toluidine
CHEMICAL COMPOSITION OF DENTURE BASE RESINS (Light-Activated Resins): Matrix	urethane dimethacrylate and microfine silica
CHEMICAL COMPOSITION OF DENTURE BASE RESINS (Light-Activated Resins): filler	acrylic resin beads
CHEMICAL COMPOSITION OF DENTURE BASE RESINS (Light-Activated Resins): photoinitiator	camphoroquine-amine
MODIFIED ACRYLIC RESINS:Improved flexural, tensile, and impact strengths, as well as fatigue resistance	Rubber Reinforced
MODIFIED ACRYLIC RESINS:Consists of interpenetrating network (IPN) of rubber and PMMA	Rubber Reinforced
MODIFIED ACRYLIC RESINS:Reduced stiffness/rigidity	Rubber Reinforced
MODIFIED ACRYLIC RESINS:High impact and flexural strength	Carbon or Kevlar Reinforced
MODIFIED ACRYLIC RESINS:Good fatigue resistance; High stiffness	Carbon or Kevlar Reinforced
MODIFIED ACRYLIC RESINS:Inferior surface finish;Poor esthetics	Carbon or Kevlar Reinforced
ratio of heat activated PMMA	3 is to 1
Heat Activated PMMA stages: first stage	Wet, sandlike stage
Heat Activated PMMA stages: as the polymer dissolves in the monomer	Tacky fibrous stage
Heat Activated PMMA stages: suitable for packing into a mold	Smooth, doughlike stage
Heat Activated PMMA stages: not packable anymore; sir ana, marami na bubbles, porosities and di na maccompress.	Stiff, rubberlike stage
avoid gaseos porosity which can be seen on the thickest part which includes	distolingual area of Mn, buccal shelf, palate, tuberosity
Gaseous porosity is caused by	rapid evaporation of monomer
Chemically Activated PMMA: CURING TIME	30 — 45 mins
Microwave activated PMMA: CURING TIME	3 mins
VLC activated Acrylic: CURING TIME	10 mins
POLYMERIZATION:Absorbs water through diffusion — linear expansion	Heat Activated PMMA
POLYMERIZATION:Dries out	Heat Activated PMMA
POLYMERIZATION:Low thermal conductivity	Heat Activated PMMA
POLYMERIZATION:Creep	Heat Activated PMMA
POLYMERIZATION:Chemically bonds with acrylic pontics	Heat Activated PMMA
POLYMERIZATION:Biocompatible **** few cases of allergic reaction.	Heat Activated PMMA
POLYMERIZATION:Cold —curing; Self-curing	Chemically Activated PMMA
POLYMERIZATION:Auto polymerizing (it’s only shrinkage)	Chemically Activated PMMA
POLYMERIZATION:High residual monomer content (3-5%)	Chemically Activated PMMA
POLYMERIZATION:Higher solubility	Chemically Activated PMMA
POLYMERIZATION:Higher creep	Chemically Activated PMMA
POLYMERIZATION:Lower color stability	Chemically Activated PMMA
POLYMERIZATION:Less biocompatible	Chemically Activated PMMA
POLYMERIZATION:Less shrinkage (MORE STABLE)	Chemically Activated PMMA
POLYMERIZATION:Uses glass fiber—reinforced plastic flask	Microwave activated PMMA
POLYMERIZATION:Same properties with HA PMMA	Microwave activated PMMA
POLYMERIZATION:Higher dimensional stability than HA PMMA	Microwave activated PMMA
POLYMERIZATION:Contains no methacrylate monomer	VLC activated Acrylic
POLYMERIZATION:No monomer	VLC activated Acrylic