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Dental Materials Final
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which organizations must approve dental materials for market?
FDA-fodd and drug administrations
what are the three dimensions of color?
Hue
Chroma
Value
what is tooth color or mixes of color?
hue
what is intensity of color
chroma
what is lightness or darkness (grayness) of color?
value
what are the differences between posterior and anterior restorative material?
anterior=esthetics
posterior=strength
what are the components of porcelain? 3
crystals of feldspar
alumina
silica
what is the greatest reason for sealant failure?
moisture
what is the greatest reason for porcelain failure?
small cracks developed from occlusal loading
what causes microleakage?
contaminants-blood, smear layer, oils
shrinkage
unbonded restorations
what restorative material has the least microleakage?
old alloys (due to corrosion blocking dentinal tubules)
what restoration class is the occlusal and buccal of posterior teeth and the lingual pits of anterior teeth?
I
what restoration class is the proximal surfaces of posterior teeth (includes the occlusal as well)
II
what restoration class is the proximal surfaces of incisors and canines (no incisal angle)
III
what restoration class is the proximal surfaces of incisors and canines, also the incisal angles?
IV
what restoration class is the gingival third of facial or lingual surfaces of the tooth?
V
what restoration class is the cusp tips of posterior teeth and incisal edges of anterior teeth?
VI
what are the effects of a high alcohol mouthwash?
drying
when is a high alcohol mouthwash contraindicated?
with xerostomia (drying)
which four additives prevent dentinal hypersensitivity?
potassium nitrate (most common)
sodium citrate
strontium chloride
topical fluoride
which topical additive acts against bacterial plaque?
chlorhexidine
what is the main ingredient in a sealant?
bisphenol A-glycidyl methacrylate (bis-GMA) or urethane dimethacrylate (UDMA)
what is the energy mechanism for polymerization?
CARBON BONDS
which monomer is used in denture base?
acrylic resin
which dental materials are polymers
resins
what are adhesive wetting aids?
acid etching
what are three different etchants?
phosphoric acid
polyacrylic acid
hydrophloric acid
what is the most commone etchant and what is used for?
phosphoric acid=sealants
what etchant is used for glass ionomers?
polycarylic acid
what etchant is used for porcelain?
hydrophloric acid
what is the purpose of bonding?
to provide a MECHANICAL and CHEMICAL BOND for RESIN MATERIALS (or combo of both)
what 6 things increase the rate of abrasion?
speed and pressure
size irregularity and hardness
number of particles
_____ speed = _____ abrasion
higher
more
what will increasing speed and pressure do to abrasion?
increase rate of abrasion
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
what is used for the final polish for the majority of restorations?
tin oxide
why should one polish fillings? 3
improves esthetics
improves tissue health
increases longevity of fillings
how does heat affect the dental pulp?
detrimental to the pulp
what is used in the lab to polish gold?
burlew wheel on slow speed handpiece
rouge on rag wheel
which cement bond to teeth? 3
zinc polycarbonxylate
resin glass ionomer (hybrid) cement
glass ionomer have a weak bond to tooth
which cement has chmical adhesion? 2
glass ionomer cements
resin cements
which cement has mechanical retention between tooth and crown? 2
zinc phosphate
zinc polycarboxylate
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
name the fluoride releasing cements
glass ionmer
hybrid ionomer
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
which dental cement sooths pulp tissue?
zinc oxide eugenol
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
which cement makes reparative dentin?
calcium hydroxide
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)
what is used to clean zinc oxide eugenol instruments?
alcohol or oragne solvent
what is used to clean zinc phosphate cement?
ultrasonic cleaner or solution of baking soda and water
Author
cassiedh
ID
82730
Card Set
Dental Materials Final
Description
general questions thru dental cements
Updated
4/30/2011, 4:16:22 AM
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