Dental Materials

25 important questions on Dental Materials

Coefficient of thermal expansion

index to indicate how one material reacts to temperature extreams

Amalgam properties and containment's

Alloy of mercury, silver, copper, tin and zinc
silver is susceptible to corrosion
Durable
compressive strength comparable to enamel
inexpensive

Bonding Agent (BIS-GMA) components and action

phosphoric acid micromechanical retention (opposite of polishing)
light activated polymerization
isolate working field from saliva
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Sealants components and action

protect surfaces from bacteria with resin
pumice, rinse, isolate, etch, rinse, dry, apply, remove excess, polymerize
mechanical retention

Composite components and action

esthetic restorative material of bonding agent and tooth-colored filler
fillers are usually silicates, quartz or glass with barium or strontium
Nanofilled-Micro-Hybrid is blend of choice

Liners components and action

seal dentin or medicate dental pulp
calcium hydroxide-stimulates dentin to repair
zinc-oxide/eugenol-soothes pulp
resin-modified gloss ionomer- releases fluoride

Zinc phosphate cement

exothermic reaction when mixing- use glass slab

Glass ionomer cement

binds to dentin
releases fluoride
thermal expansion and contract similar to tooth
class V restorative

Zinc-oxide/eugenol cement

temporary cement

Aqueous hydrocolloid irreversible impression material

chemical rx only
irreversible
not temperature dependent
susceptible to imbibition and syneresis (swelling and shrinking)
popular choice

Non-aqueous polysulfide rubber impression material

messy, smelly, must be poured same day

Non-aqueous polyether rubber impression material

rigid, good tissue detail
will distort if left wet

Non-aqueous silicone rubber impression material

putty-like, rarely used

Non-aqueous vinylpolysiloxane impression material

tasteless, odorless capable of multiple pours

Alpha-calcium sulfate hemi-hydrate gypsum product

less water needed- stronger
stone 
Type III

Beta-calcium sulfate hemi-hydrate gypsum product

more water needed- weaker
plaster
Type II

Inlay and casting wax

used for cast restorative patterns

Bite registration wax

obtaining occlusal records

Casting alloys purpose

inlays, onlays, crowns and bridges

Precious alloys with noble metals

resist tarnish and corrosion
gold,platinum, and palladium

Nonprecious alloys with base metals

subject to tarnish and corrosion
silver, copper, nickle, tin and zinc

Tarter control formula toothpastes

pyrophosphate
cause of dentinal hypersensitivity

Gum care toothpastes

triclosan
antimicrobial agent

Class I restorations

all pits and fissures

Class V restorations

facial or lingual gingival third

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