Denture Base Resins Flashcards
What is resin?
a broad term used to describe natural oof synthetic substances that form plasti cmaterails after polymerization
What is acrylic?
designating a colorless, pungent acid
What are the properties of PMMA resin?
- excellent esthetic properties
- adequate strength
- low water sorption
- low solubility
- non-toxic, low allergenicity
- easily repaired
- reproduced detail accurately
- simple molding and processing technique
What are the ingredients of PMMA resin?
- liquid monomer (methyl methacrylate)
- powdered polymer (polymethyl methacrylate)
- plasticizer (dibutyl phthalate)
- initator (benzoyl peroxide)
- pigments
What does the PMMA liquid contain?
- methyl methacrylate
- glycol dimetacrylate (cross-linking)
- hydroquinone (increase shelf life)
What are the different types of acrylic resin?
What are the systems of PMMA resin?
- liquid monomer
- powdered polymer
What does the PMMA powder contain?
- PMMA beads
- pigments
- plasticizer (dibutyl phthalate)
- benzoyl peroxide (initator of polymerization)
What types of cure can resin have?
- heat cure
- chemical cure
- light cure
What are the characteristics of heat-activated denture base?
- used in fabrication of all denture base
- thermal energy required for polymerization
- composition
- PMMA (powder and liquid)
- Powder
- Liquid
- cross linking agent is added to liquid
What are the techniques to process denture resins?
- compression molding
- injection modling technique
What are the bubbles in the processed denture called?
porosity
- spherical bubbles inside resin
What is the difference between internal and other types of porosity?
- internal porosity (caused by a temperature above 100 degrees C inside the flask)
- other porosity (inadequate pressure, not enough resin in mold, improperly mixed resin)
What are denture teeth made of?
- same composition as the denture base resin, except for pigmentation to produce tooth shades
What is an autopolymerized resin?
- amine in the liquid reacts with the benzoyl peroxide in the powder to promote polymerization at room temp