Across
- 2. The first stage of addition polymerization, where a free radical initiates the reaction by opening the bond between the carbon atoms of a monomer.
- 6. Sorption The absorption of water by a material. In denture bases, this causes a slight increase in size that helps offset polymerization shrinkage
- 7. Small molecules that serve as the basic building blocks that chemically join together to form polymers.
- 10. Large, long-chain molecules formed from the chemical bonding of many smaller molecules (monomers).
- 11. Resins Synthetic polymers used in prosthetic dentistry that are derived from acrylic acid.
- 12. Reaction A type of polymerization that produces by-products such as water, hydrogen gas, or alcohol. It is not commonly used in dentistry.
- 14. Stage The first physical stage in mixing acrylic resin, occurring immediately after the powder and liquid are combined.
- 16. The final stage of addition polymerization, which occurs when the free radical is tied up or destroyed, stopping the growth of the polymer chain.
- 19. Methacrylate (PMMA) The scientific name for the acrylic resin created when a liquid monomer is mixed with a powder of polymer beads and undergoes polymerization.
- 21. The act or process of forming polymers by chemically linking monomers. All polymerization processes release heat.
- 22. Stage The third physical stage in mixing acrylic resin, where the material becomes easily manipulated.
- 23. Stage The final physical stage in mixing acrylic resin, where the material has a rubbery consistency and can no longer be manipulated.
Down
- 1. Modifying agents, along with rubbers and fillers, that are added to acrylic resins to change their physical properties.
- 3. Conductivity The ability of a material to conduct or transfer heat. Acrylic resins are poor thermal conductors.
- 4. The presence of small or microscopic voids within a material, which can weaken it and lead to the collection of debris and microorganisms.
- 5. The second stage of addition polymerization, which involves the process of linking monomer units to form a growing chain.
- 8. Stage The second physical stage in mixing acrylic resin, where the powder begins to absorb the liquid.
- 9. Polymers formed when two or more different types of monomers are chemically joined together.
- 13. Reaction The most common type of polymerization in dentistry, which proceeds in three stages (initiation, propagation, termination) and produces no by-products.
- 15. polymerizing A term for a chemical-curing or self-curing polymerization reaction.
- 17. Definition
- 18. A method of polymerization initiated by a chemical reaction, resulting in a material that is softer and weaker than heat-cured resins.
- 20. A polymerization method initiated by the application of heat, resulting in a stronger, harder, and less porous material.