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129 Cards in this Set

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  • Back
What are the guidelines for selecting a shade of composite?
clean the teeth first
use natural light
compare shade color to tooth color using a neutral background
pick the shade before placing a rubber dam
Why should teeth be cleaned prior to composite placement?
allows better adhesion of restoration to tooth surface
What qualities do shade guides differentiate?
value
hue
chroma
What is metamerism?
when 2 samples match in color in one situation but not another
When curing a small amount of composite to a tooth to check if the shade matches, what must you not do?
do not etch the tooth before adding the composite
Which is more opaque: dentin or enamel?
dentin
Do shade guides need to be sterilized between patients?
No, just disinfect with chemical spray
How long does it take to whiten blue/gray stains?
2-6 weeks
How long does it take to whiten tetracycline stains?
3-6 months
How long does it take to whiten yellow/brown discoloration?
1-3 weeks
Why do you need to wait after bleaching before placing composites, and how long should you wait?
wait 2 weeks because residual peroxide may affect bond strengths
What are common adverse effects of bleaching?
tooth sensitivity
gingival irritation
What do most bleaching products contain?
1/3 carbamide peroxide
2/3 stabilizer (urea)
What is the conversion ratio of carbamide peroxide to hydrogen peroxide?
3:1
How does bleaching occur?
peroxide penetrates dentin and oxidizes the stains
How much hydrogen peroxide do typical whitening strips contian?
6-10%
What is the only ADA-approved tooth whitening formula?
10% carbamide peroxide
What is Opauluster used for?
shallow brown or white discolorations
What ingradients are used to treat tooth sensitivity?
fluoride or potassium nitrate
What leads to tooth sensitivity?
tooth dehydration
What is a possible adverse effect of bleaching nonvital teeth?
root resorption
How far should a bleaching tray be trimmed?
0.5 mm beyond the CEJ
How much LC Blockout is used when making a bleaching tray?
0.5 mm thickness
1 mm from gingival margin
True or False: Casts for bleaching trays require a second pour.
False
What is the justification for using amalgam for Class III restorations on the distal of canines?
metallic restoration helps preserve integrity of the arch by preventing mesial drifting
What retentive features are necessary for a Class III amalgam?
incisal point or groove
gingival groove
Which contacts definitely need to, don't necessarily need to, and don't need to be broken for a Class III preparation from the lingual?
need to break gingival and lingual
don't necessarily need to break facial
don't need to break incisal
When is macromechanical retention suggested for Class III composite preparations?
when the gingival margin is in cementum or dentin, as opposed to enamel
True or False: It is permissible to leave unsupported enamel on a Class III composite preparation.
True, as long as it's not friable or severely weakened
What is the pre-patient care ideal mesial-distal width of a Class III preparation?
1.0 mm
What angle should the bevel on a Class III composite preparation have and how wide should it be?
45º angle
0.25-0.50 mm wide
When is the facial approach acceptable for Class III preparations?
lesion extends to facial surface
tooth alignment makes lingual approach difficult
replacing a failed facial restoration
What is the decreasing order of coarseness for polishing discs?
gray
blue
yellow
pink
What type of pins are most commonly used for pin-retained amalgam restorations?
self-threading
Why aren't friction lock pins used often for pin-retained amalgam restorations?
potential for fracture
What type of pins are smaller than their pin hole?
cemented pins
Which pin has a 0.021" drill and 0.024" pin?
minim
Which pin has a 0.017" drill and 0.019" pin?
minikin
Why aren't pins placed horizontally for pin-retained amalgam preparations?
difficult to condense amalgam under the pin
Which pins are used to replace one cusp on a premolar?
2 minikin
Which pins are used to replace both cusps on a premolar?
1 minim and 2 minikin
Whichs areas on teeth should be avoided when placing pins?
mid-proximal
furcation areas
palatal of maxillary molars (root angulation)
distal of mandibular molars (root angulation)
mesiobuccal of molars (prominent MB pulp horn)
How far from the external tooth surface should a pin be placed?
1.5 mm
What length of a pin gets embedded in tooth?
2.0 mm
What distance should remain above a pin for amalgam condensation?
at least 2.0 mm
How far apart should minikin pins be placed from each other?
3.0 mm
How far apart should minim pins be placed from each other?
5.0 mm
What is the process of annealing gold foil commonly referred to as?
degassing
What chemical can be used for the final polish of amalgam restorations?
tin oxide
Increased pin diameter has what effect on retention of amalgam?
increases retention
How wide should the bevel be on Class IV preparations?
1.0 mm
What are two reasons for beveling Class IV preparations?
improved esthetics
retention
True or False: For a Class IV restorations, enamel should only be etched to the end of the bevel.
False
Should polishing discs be moved from restoration to tooth or from tooth to restoration?
restoration to tooth
When using multiple materials for a Class IV restoration, what is the sequence of materials used?
nanofill
opaquer
microfill
Why is microfill good to use as an enamel replacement?
it can obtain a high polish
At what distance does a diastema become unesthetic?
2.0 mm
How long is the crown of a permanent maxillary central incisor?
10.5-11.0 mm
How wide is the crown of a permanent maxillary central incisor?
9.0 mm
What should be avoided when building up composite to restore a peg lateral?
avoid joining increments on the facial
What retentitive features are needed for an amalgam slot preparation?
grooves at the facial and lingual
What is one feature that is used for a composite slot preparation, but not an amalgam slot preparation?
0.5 mm bevel on the interproximal margins
What kind of band is used for an amalgam slot restoration?
0.0010" dead soft band
What kind of band is used for a composite slot restoration?
0.0015" universal band
Why might flowable composite be used for the first increment in a composite slot restoration?
to counter polymerization skrinkage
Why might surface glaze be used on an MO composite restoration?
it may improve wear
Why are finishing strips used in an S motion?
to avoid eliminating proximal contact
How wide mesially-distally should the gingival floor be on a Class II amalgam preparation on a molar?
1.25 mm
How tall gingivally-occlusally should the step be in a Class II amalgam preparation on a molar?
1.0 mm
If restoring #3MO and #4MO with amalgam, which tooth should be restored first and why?
#4 because you shouldn't place a band on a newly formed contact
What is the purpose of making an S curve?
break the contact and still conserve tooth structure
Is an S curve more commonly used on the buccal or lingual?
buccal
What is the pre-patient care ideal depth for a Class II amalgam preparation on a molar?
1.5-2.0 mm
What is an indication for a Class V amalgam restoration?
inability to control moisture when placing the restoration
What is an indication for a Class V glass ionomer restoration?
root caries
What is the sandwich technique for Class V restorations?
glass ionomer over the dentin and resin composite on top of it
What causes abfraction?
flexure of tooth under occlusal stress
Should a material used to repair abfraction have a high or low modulus of elasticity?
low
What is the ideal pre-patient care depth on a Class V amalgam preparation?
0.75 mm gingivally
1.25 mm incisally
What macromechanical retentive features are used for a Class V amalgam preparation?
gingival groove
incisal point
How far should you extend mesially and distally for a Class V amalgam preparation?
to the mesial and distal line angles
What is the pre-patient care ideal gingival extension for Class V preparations?
0.5 mm from the gingival margin
What is the number of the gingival retraction clamp?
#212
True or False: A Class V preparation for resin modified glass ionomer should be beveled.
False
True or False: Inlays and onlays are both considered intracoronal restorations.
True
Are inlays and onlays considered direct or indirect restorations?
indirect
True or False: Gold has high resistance to tarnish.
True
Which has the greatest and which has the lowest coefficient of thermal expansion: amalgam, composite, gold, or porcelain?
greatest: composite
lowest: porcelain
Which has the greatest and which has the least thermal conductivity: amalgam, composite, gold, or porcelain?
greatest: gold
least: porcelain
Which has the greatest and which has the least compressive strength: amalgam, composite, gold, or porcelain?
greatest: amalgam
least: porcelain
Which has the highest and which has the lowest modulus of elasticity: amalgam, composite, gold, porcelain?
greatest: gold
lowest: composite
Which bur is used for the occlusal portion of a Class I gold inlay preparation?
#271 fissure bur
What is the degree of taper of the #271 bur?
What is the ideal pre-patient care depth for a Class I gold inlay preparation?
1.5-2.0 mm
What is the ideal pre-patient care width for the isthmus of a Class I gold inlay preparation?
1.0-1.5 mm
How wide should the mesial and distal marginal ridges be on a Class I gold inlay preparation?
1.0-1.5 mm
How far from the occlusal contacts should the occlusal outline of an inlay preparation be?
at least 1.0 mm
What effect does increasing buccal-facial wall divergence have on inlay retention?
decreases retention
Should the internal line angles of a Class I gold inlay preparation be rounded or sharp?
sharp
What is the maximum buccal-lingual width at the occlusal surface of a gold inlay?
1/3 of the buccal-lingual tooth width
What should be the angle and how wide should the bevel be for a Class I gold inlay preparation?
40º
0.5-1.0 mm
What material is commonly used for provisional restorations?
acrylic resin
True or False: Gold inlays must be polished to a high shine.
True
What is the ideal pre-patient care mesial-distal width of the gingival floor for a Class II gold inlay preparation?
1.0-1.5 mm
What is the ideal pre-patient care depth for a Class I ceramic inlay preparation?
1.5-2.5 mm
Should the internal line angles of a Class I ceramic inlay preparation be rounded or sharp?
rounded
What is the ideal pre-patient care isthmus width for a Class I ceramic inlay preparation?
1.5-2.0 mm
What are the ingredients in dental porcelain?
Feldspar
Quartz
Kaolin
Metallic pigments
Which bur is used for the occlusal portion of a Class I ceramic inlay preparation?
#856 round-end tapered diamond bur
Arrange the following bur markings in order of increasing coarseness: black line, green line, no line, red line
red line
no line
green line
black line
True or False: Class I ceramic inlay preparations must be beveled.
False
What is the ideal degree of axial wall taper for a Class I ceramic inlay preparation?
6-10º
What is a significant disadvantage of tooth-colored inlays?
wear of the opposing teeth
What can happen if the isthmus of a Class I ceramic inlay preparation is too narrow?
a tension zone is created, which can lead to fracture
How much occlusal reduction is necessary for an onlay preparation?
1.25-1.50 mm
Which cusps need a shoulder with a bevel on a gold onlay preparation?
centric cusps
Which cusps need a skirt on a gold onlay preparation?
non-centric cusps
How wide should the shoulder be on a gold onlay preparation?
1.0-1.25 mm
How wide should the bevel on the shoulder of a gold onlay preparation be?
0.5-1.0 mm
What should be the angle for the bevel on the skirt of a gold onlay preparation?
30º
How far should the shoulder of a gold onlay preparation be from any occlusal contacts?
1.0 mm
What is the difference between a finish line and a margin?
finish line refers to the prepared tooth
margin refers to the edge of a restoration
How much should the facial surface of tooth #8 be reduced for a porcelain veneer preparation?
0.3 mm
What kind of finish line should a porcelain veneer preparation have?
chamfer
How much is the the incisal reduction of tooth #8 for a porcelain veneer preparation?
at least 1.0 mm
How should the non-centric cusps be prepared for a ceramic onlay?
butt-joint margin
What is the ideal total occlusal convergence for a crown preparation?
10-20º
What is the recommended occlusal-cervical/facial-lingual ratio for a crown preparation?
at least 0.4
What is the minimal occlusal-cervical dimension for a crown?
4 mm on molars
3 mm on other teeth