Dental Materials Midterm

coefficient of thermal expansion
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Terms in this set (66)
class 3anterior interproximalclass 4anterior involving the incisal edgeclass 5smooth surfaceinlaydoes not cover cusps of toothonlycovers thee cusps of toothindirect restorationmust be created in lab and takes ore than one appt. ex. bridges crowns vaneers inlays onlaysdirect restorationcan be done entirely in one appt. ex. composite amalgamrole of etch and its chemical makeup37% phosphoric acid 15-30 seconds etching enamel creates micropores in enamelSelf-curedcomes in 2 parts you mix together to begin polymerizationpolymerized sealantuses light to cureerrors in placement of sealantsnot cured long enough didn't isolate area product is expired patient is not compliantresin material of sealantsBis- GMA similar to composite less viscoussealant placementfully erupted teeth no operculum which is any molar erupting with gum tissue still covering itmaterials used for tooth whiteninghydrogen peroxide (stronger) carbomide peroxideside effects of whiteningtooth sensitivity and gingival irritationOxidationhydrogen peroxide becomes oxidized and breaks down stains in the teethalginate mixing procedureuse the correct water to powder ratio place water in the bowl than add powder mix until smooth about 1 minutealginate indicationsstudy models, primary impressions for dentures and partial dentures, night guards, whitening trays , fluoride traysagar indicationscrown and bridge and high accuracyalginateirreversible hydrocolloidagarreversible hydrocolloidcastreplica of multiple teethdiereplica of a single toothmodelused for observationsMicroleakageleakage of fluid and bacteria caused by microscopic gaps that occur at the interface of the tote and the restoration marginsexothermic reactionthe production of heat resulting from the creation of the components of some materials when they are mixedpercolationmovement of fluid in the microscopic gap of a restoration margin as a result of differences in the expansion and contraction rates of a tooth and the restoration temp. changes asscoatied with ingestion of cold or hot fluids or foodsgelationhydrocolloids, alginate and agar set by changing from sol to gelhardness testuses a special tip to measure the hardnessRatios of linerslow more liquid than powder you want it to be thin for a linerratios for basesmore powder than liquid you want it to be thicker for a basecalcium hydroxideStimulates secondary dentistry and is the best known linerimproved stonestrongest proper mixing is 24 ml water 100 grams of powderstonestronger proper mixing is 30 ml water and 100 grams of powderplasterleast strongest proper mixing is 50 ml water and 100 grams of powderglass isomeruse polyacrylic acid and includes glass powder instead of zinc oxide. chemically bonds to dentin and enameleugenolan organic liquid that is also a weak acid major component is oil from cloves obtundent to the pulp which means it reduces irritationzinc oxideonly insoluble nontoxic reactive oxide or hydroxide that is available to react with an acidpolysiloxanespolyvinyl siloxanes PVSvery accurate addition silicone elastomers impression material; it is used extensively for crown and bridge procedures because of its acccuracy, dimensional stability, and ease of use.polyethersworking and setting times are shorter, very stiff and set quickly very accurate and easy to pour impergum in the most popularpolysulfidenon aqueous elastic material " rubber" two pastes in tubes use spatula to mix more accurate the alginate used for inlays crows and bridges should be poured within several hours after mixingsealant steps1.surface prep remove debris from teeth 2. use hve to remove pumice 3. isolation (rubber damn or cotton rolls) 4. dry tooth 5. apply etch 6. use hve to remove etch 7. re-isolate 8. dry tooth 9. check for chalky appearance 10. apply sealant 11. polymerize sealant with curing light 12. evaluate sealant 13. remove excess fin with cotton roll 14. check occlusion with articulating paper 15. floss interproximal spaces 16. allow patient to rinseBio-compatibilityThe property of a material that allows it not to impede or adversely affect living tissuehydrophilicwater lovinghydrophobicWater fearingintrinsic stainingDiscoloration of the teeth from within ex. tetracyclineextrinsic stainingexternal staining ex. food beverages coffee sodaHemihydrateRemoval of water to become one-half part water to one part of calcium sulfate, forming the powder product of gypsum.DihydrateRelated to gypsum products and indicating two parts of water to one part of calcium sulfatelinerprotects pulp from chemical irritation very thin layer less than .5mmEugenolobtundent/palliative reduced irritationpolyacrylic acidhas ability to bond to calcium in tooth structurePhosphoric Acidcontains 2/3 acid 1/3 water very irritating to tissue water content critical to setting reactionfor a baseadd powder until material can be rolled to a ballglass ionomer propertiesbonds to tooth structure released flouride