DENTAL MATERIALS CHAPTER 11
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Created by:
jasminmcclellan on October 29, 2010
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review of chapter 11
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36 terms
Terms | Definitions |
|---|---|
 acrylic resin | hard, brittle, glassy polymer. Clear and colorless, easily colored. Methylmethacrylate is the most common. It sets via addition polymerization |
| chemically activated/cold cure | supplied as a powder & liquid. Polymer = powder and monomer = liquid. It sets via polymerization reaction |
| typical activator in a cold cure or chemical cure system that is added to the liquid | tertiary amine |
| heat activated | stronger and tougher and have a longer working time. Material gets heated in a hot water bath which breaks down the benzoyl peroxide, forming free readicals |
| what initiates polymerization in both chemical cure and heat activated | benzoyl peroxide |
| main difference between chemical cure and heat activated | no chemical activator is present in the liquid, making the mixed material of the heat activated stay in the dough stage longer, allowing more working time |
| complete/full denture | replaces an entire arch of missing teeth. Replaces alveolar bone, which is resorbed when teeth are missing |
| denture base | constructed on the master cast made from the final impression. It is the pink part of the denture that sits on the alveolar ridge |
| flask | processing a denture involves embedding the master cast and the denture setup in a denture flask filled with gypsum materials |
| denture setup | when all the teeth are set in wax. Simulates the proper bite, vertical dimension, and esthetics |
| wax try-in | allows patients to see the arrangement of teeth that their denture will have. Also allows the dentist to check function, occlusion, and phonetics before the actual denture is processed |
| monomer | methylmethacrylate. A cross linking agent, such as glycol dimethacrylate is added. An inhibitor is always added to methylmethacrylate to prevent premature polymerization. HYDROQUINONE IS MOST COMMONLY USED |
| vertical dimension | distance between the 2 arches |
| removable partial denture | if the prosthesis can be removed by the patient |
| relining | an "old" denture can have its fit improved this way. It adds a small amount of new material to the inside tissue area of the denture base to replace the additional ridge that has been lost since the denture was made. Resin material is added to the tissue side of the denture. |
| immediate denture | placed at the same appointment during which the remaining teeth are extracted. It not only restores function and esthetics, it can also protect the extraction sites during healing. |
| to repair a broken denture, a thin layer is ground off. Next, the monomer is applied to the surfaces so that | some of the set material is dissolved |
| included in partial denture frameworks | clasps,connectors, and mesh |
| cross-linking of acrylic resins will improve the mechanical properties. The most important or beneficial property it would improve would be | toughness |
| easiest arch of dentures to wear | maxillary |
| helps to improve the suction needed to hold a denture in place | saliva |
| the wax rims used for denture construction serve to determine the patient's | midline, plane of occlusion, & the size of denture teeth |
| the acrylic resin of a partial denture is processed the same way as a complete denture except | the acrylic resin must flow through and around the mesh of the framework |
| 1st step in constructing dentures | the baseplate and wax rims are constructed on the master cast |
| 2nd step in constructing dentures | the baseplate and rims are fitted on patient; midline, plane of occlusion, and bite determined |
| 3rd step in constructing dentures | casts and rims are mounted on an articulator |
| 4th step in constructing dentures | denture teeth are set in wax |
| 5th step in constructing dentures | the patient has the wax try-in |
| 6th step in constructing dentures | the master cast and denture setup are embedded in stone within the denture flask |
| 7th step in constructing dentures | the mold is created by heating in hot water, the baseplate is removed, the wax is flushed out, and the teeth remain in stone |
| 8th step in constructing dentures | acrylic resin is mixed and placed in the mold, and the mold is then compressed |
| 9th step in constructing dentures | the flask is heated and the resin polymerizes |
| 10th step in constructing dentures | the denture is removed from the mold, finished, polished, and then disinfected |
| what should be done with dentures at night | they should be removed and placed in water |
| what happens to dentures if they are not kept in water and are allowed to dry out | they will warp |
| uses for acrylic resins | temporary crowns, custom trays, and bases for complete and partial dentures |
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