Final exam Flashcards
When a 2 paste system of ZOE is used, how are the materials mixed?
until a uniform color is achieved
classifications of class 2 gold alloy?
medium
inlays, crowns
medium yield strength
medium wear resistance
What is a negative impression?
impression of the patients mouth, when alginate
mixture of small and microfine particles
microhybrid
composition of sealant materials?
bis-GMA glycidyl methalcrylate
UDMA urethane dimethacrylate
microhybrid with nanosized particles added
nanohybrid
how do you test for mercury levels?
urine sample
what is 1 spill of mercury?
400 mg
how are the anterior borders of diagnostic cast trimmed?
symmetrical to the midline
maxillary- runs distal of k9 to midline
mandibular- distal of k9 to distal of k9
what is the act of mixing amalgam?
trituration
this is the color of a tooth or restoration. it may include a mixture of colors such as yellow-brown
hue
What does a class 1 gold alloy consist of?
soft
inlays (not heavy in function)
low yield strength
low wear resistance
What are the types of trays used for impressions?
polysulfide
poly vinyl
alginate
amount of lightness or darkness of the tooth
value
what organs are affected by mercury?
kidneys is the main organ
brain, kidneys, and testicles retain the longest
What is an alginate impression tray?
metal preforated trays
disposable
stock
what makes ZOE biocompatible with tooth structures?
the neutral PH of 7
what stone is the choice of pouring impression materials?
microstone.. it is less porous and gives greater detail
what is a metallic restoration material composed of silver based alloy with mercury?
amalgam
What are the two ways elastic impression material can be classified by?
Irreversible and reversible
fillers that are smaller, averaging 0.04 in diamete and 0.03 to 0.5
microfilled
What was G.V Black’s classification of cavities?
He and Frederick McKay determined drinking water was the factor of cavities.
what is the anatomical portion of the cast?
oral anatomy.. comprises 2/3 total heigh
What type of elastic material will not return to its original state?
Irreversible (powder/liquid)
class 2 of gypsum products
model plaster (almost obsolete)
indirect restorations
fabricated outside of the pt. mouth
these materials are expected to be long lasting replacement for missing damaged or discolored teeth
permanent restorations
what are the steps in applying a sealant?
isolate with cotton roll or rubber dam pumice tooth with non fluoridated paste rinse and dry apply etchant for 60 seconds rinse and dry apply sealant in pits and fissures light cure for 30-60 seconds floss check occlusion
what does TLV mean?
threshold limit value
what are the sizes of the mandibular impression trays?
20-25
20 is the largest
What are veneers?
thin layers of esthetic materials that are used to improve the appearance of the teeth. they are bonded to the fronts of the teeth. they can be used to lighten the color of teeth, cover stains, repair chips or other defects, lengthen worn teeth, increase the size of small teeth, close spaces, or reshape crooked teeth.
PFG
porcelain fused gold
What are the classifications of impression materials?
Elastic and Rigid
what are ZOE cements?
Zinc Oxide Eugenol cements
what is boxing wax?
wrap around the impression to make a base
what is a poly vinyl impression tray?
stock, disposable, tri-tray
What is a poly sulfide impression tray?
custom tray
what are classification of composites by filler size
macrofilled, microfilled, hybrid, microhybrid, nanohybrid, nanocomposites..
classifications of class 3 gold alloy?
hard
inlays, crowns, bridges
high yield strength
high wear resistance
these are positive replicas of teeth produced from impressions that create a negative representations of teeth.. commonly called study models and generally from plaster or stone. used for pt. education, treatment planning, and for tracking the progress of treatment or for numerous chairside and lab procedures..
diagnostic casts
what gauge material is used in fabricating mouth protector?
.080
contain both large and small fillers
hybrid
aka provisional restorations used for short periods of time, several days to weeks
temporary restoration
class 4 gypsum products
dye stone (made to pour dyes, used for ceramics/crowns)
What are ZOE cements used for?
temporary cementation, temp. or intermediate restorations, high and low strength bases, and as root canal sealers and perio dressings.
like provisional, placed for limited time however the time may extend from weeks to months..
intermediate
Resin bonded cement
Max-Cem Elite: this cement etches, bonds and adheres to the tooth structure all in one. It has nano-particles, contains quartz, lithium and is very compatible to the tooth structure and the crown, bridge or veneer. No mixing!!! Just insert mixing tip
Zinc polycarboxylate
supplied P/L
used for final cementation of indirect restorations, long term temp. cements
What type of impression material is able to pick up undercuts?
elastic
What material that we discussed in class is reversbile?
Rigid impression material (thermoplastic)
what are ZOE cements ideally suited for and why?
temporary restoration- their weaker tensile strength allows them to be easily removed at a second appt. when a temp. restoration is to be placed..
what are sealants?
unfilled or lightly filled resin used to seal noncarious pits/fissures of deciduous and permanent teeth
this is the measure of gold content
karat
this is the intensity of strength of a color.. such as bold yellow vs. pastel yellow
chroma
How do composite materials come supplied?
delivery system
single syringe
two paste system
which type of impression material will not pick up undercuts?
rigid
physical and chemical properties of gypsum?
dihydrate (cas04*2h20) happens when water is mixed with powder
hemihydrate (cas04*1/2h20) process called calciling to dry off powder (powder in plaster bin)
what gauge material is used to fabricate bleaching tray?
0.040
what are the sizes of the maxillary impression trays?
1-5
1 is the largest
how are the lateral borders of cast trimmed?
parallel to the buccal surface of the posterior teeth
distal of k9 to distal of molar
what are the steps in fabricating mouth protectors?
trim casts in horsehoe shape insert material in frame place max. cast on platform lower when heated and sagged and turn vaccum on remove guard after cooled trim excess material from cast
large particles, ranging from 10-100 microns. make composites difficult to polish and become rough
macrofilled
filler particles ranging from 5-75 nanometers
nanocomposites
class 1 of gypsum products
impression plater, almost obsolete
classifications of restorative materials
intermediate
temporary
permanent
GC
gold crown
what is the safe level for mercury in a 40 hr work week?
.005/m3
How are ZOE cements available?
powder/liquid, and paste/paste systems
What is a positive impression?
when the impression is set in stone.. it has been poured and is known as a diagnostic cast
how are the posterior borders of cast trimmed?
square with the midline.. trim these while the maxillary and mandibular casts are together
When the powder/liquid system of ZOE is used, how is it mixed?
powder is incorporated into the liquid until the desired heavy consistency is achieved.
what is 2 spills of mercury?
600 mg
what is the art portion of a diagnostic cast?
serves as a base of the study model.. it comprises 1/3 of total height
Glass ionomers
capsule form now and are mixed in a machine called a Vari-mix. Should you have to mix any of these in the powder/liquid version the ratio is now labeled on top of the bottles due to diversity so everyone can mix the dental materials needed for cementation of crown, bridges and veneers.
What type of elastic material will return to its original state?
Reversible (only one type of impression is reversible)
class 3 gypsum products
dental stone (stone we use, microstone)
what are the types of permanent cements?
resin-bonded
glass ionomers
zinc polycarboxylate
What is the composition of alginate impression material?
agar
1:1 ratio of powder into liquid
What has eugenol been known for?
its sedative effect to the pulp, largely caused by its antibacterial effects
Uses of gypsum?
diagnostic casts, working casts, cye
what are the steps in fabricating a bleaching tray?
trim casts apply block out resin to teeth light cure block out resin clamp thermoplastic sheet in vaccum former place cast in center of platform once material sags when heated, lower frame and turn on vaccum cool for one minute remove cast trim with scissors repeat process
how does mercury come supplied?
in premeasured capsules, known as mgs spills
composition of polysulfide impression material?
sulfa
1:1 ratio, used for dentures or crown and bridge
classifications of class 4 gold alloy?
extra hard
partial denture, framework, bridges
high yield strength
high wear resistance
what metalas are used to fabricate implants?
titanium
what metals are used to fabricate partials?
cobalt
chromium
alloy
What does a diagnostic study model contain?
maxillary and mandibular cast
3/3
what is 3 spills of mercury?
800 mg
what is the composition for polyvinyl impression material?
polyvinyl siloxane used for crown and bridge
1:1 ratio scoop
Direct restorations
placed directly onto cavity preparations
composition of ZOE?
Powder- ZINC
Liquid- EUGENOL
what are the parts of the model trimmer?
grinding wheel
casing (outside)
platforms
what is the percentage of gold times ten?
fineness
