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cassiedh
on FreezingBlue Flashcards.
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which organizations must approve dental materials for market?
FDA-fodd and drug administrations
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what are the three dimensions of color?
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what is tooth color or mixes of color?
hue
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what is intensity of color
chroma
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what is lightness or darkness (grayness) of color?
value
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what are the differences between posterior and anterior restorative material?
- anterior=esthetics
- posterior=strength
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what are the components of porcelain? 3
- crystals of feldspar
- alumina
- silica
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what is the greatest reason for sealant failure?
moisture
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what is the greatest reason for porcelain failure?
small cracks developed from occlusal loading
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what causes microleakage?
- contaminants-blood, smear layer, oils
- shrinkage
- unbonded restorations
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what restorative material has the least microleakage?
old alloys (due to corrosion blocking dentinal tubules)
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what restoration class is the occlusal and buccal of posterior teeth and the lingual pits of anterior teeth?
I
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what restoration class is the proximal surfaces of posterior teeth (includes the occlusal as well)
II
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what restoration class is the proximal surfaces of incisors and canines (no incisal angle)
III
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what restoration class is the proximal surfaces of incisors and canines, also the incisal angles?
IV
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what restoration class is the gingival third of facial or lingual surfaces of the tooth?
V
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what restoration class is the cusp tips of posterior teeth and incisal edges of anterior teeth?
VI
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what are the effects of a high alcohol mouthwash?
drying
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when is a high alcohol mouthwash contraindicated?
with xerostomia (drying)
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which four additives prevent dentinal hypersensitivity?
- potassium nitrate (most common)
- sodium citrate
- strontium chloride
- topical fluoride
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which topical additive acts against bacterial plaque?
chlorhexidine
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what is the main ingredient in a sealant?
bisphenol A-glycidyl methacrylate (bis-GMA) or urethane dimethacrylate (UDMA)
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what is the energy mechanism for polymerization?
CARBON BONDS
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which monomer is used in denture base?
acrylic resin
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which dental materials are polymers
resins
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what are adhesive wetting aids?
acid etching
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what are three different etchants?
- phosphoric acid
- polyacrylic acid
- hydrophloric acid
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what is the most commone etchant and what is used for?
phosphoric acid=sealants
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what etchant is used for glass ionomers?
polycarylic acid
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what etchant is used for porcelain?
hydrophloric acid
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what is the purpose of bonding?
to provide a MECHANICAL and CHEMICAL BOND for RESIN MATERIALS (or combo of both)
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what 6 things increase the rate of abrasion?
- speed and pressure
- size irregularity and hardness
- number of particles
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_____ speed = _____ abrasion
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what will increasing speed and pressure do to abrasion?
increase rate of abrasion
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what are adverse reactions of abrasives/polishes? 3
- fluoride-rich enamel layer is polished away
- polish away contact and margins of restorations
- exposed cementum or demineralized enamel removed
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what is used for the final polish for the majority of restorations?
tin oxide
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why should one polish fillings? 3
- improves esthetics
- improves tissue health
- increases longevity of fillings
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how does heat affect the dental pulp?
detrimental to the pulp
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what is used in the lab to polish gold?
- burlew wheel on slow speed handpiece
- rouge on rag wheel
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which cement bond to teeth? 3
- zinc polycarbonxylate
- resin glass ionomer (hybrid) cement
- glass ionomer have a weak bond to tooth
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which cement has chmical adhesion? 2
- glass ionomer cements
- resin cements
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which cement has mechanical retention between tooth and crown? 2
- zinc phosphate
- zinc polycarboxylate
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what are the differences between high and low strength bases/liners?
- high strength base/liner-provides THERMAL insulation and MECHANICAL support for restorations
- low strength base/liner-PULP capping, stimulates secondary dentin, barrier between pulp and restoration
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name the fluoride releasing cements
- glass ionmer
- hybrid ionomer
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what are the purposes of bases/liners?
- liners-seal dentin or medicate the dentinal pulp
- bases-provide thermal insulation or mechanical protection of the dental pulp
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which dental cement sooths pulp tissue?
zinc oxide eugenol
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what are the characteristics of a base?
- bases are used to provide THERMAL INSULATION OR MEHCANICAL PROTECTION for the dental pulp
- includes ALL CEMENTS because cements are poor thermal conductors and have adequate compressive strength
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which cement makes reparative dentin?
calcium hydroxide
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what are the porperites of cements that allow them to be used as bases?
poor thermal conductors, adequate compressive strength (they insulate and protect the pulp)
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what is used to clean zinc oxide eugenol instruments?
alcohol or oragne solvent
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what is used to clean zinc phosphate cement?
ultrasonic cleaner or solution of baking soda and water
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