Finals 2nd Exam Flashcards
Porcelain Fused to Metal Crown (PFM) is also known as;
a.) Porcelain Jacket Crown
b.) Metal-Ceramic Crown
c.) Porcelain Bonded to Metal Crown d.) Choices A and B
B
A conservative restoration and considered an esthetic alternative to Complete Coverage
a.) Porcelain Laminate Veneers
b.) Porcelain Jacket Crown
c.) Porcelain Terminate Crown
d.) Gold Quarter Crowns
e.) All of the above
A
3.The first layer of Porcelain in the fabrication of PFM:
a.) Apex porcelain
b.) Enamel Porcelain
c.) Dentin Porcelain
d.) Cementum Porcelain e.) Opaque Porcelain
E
4.This technique was first devised for the porcelain laminate veneer and entails the use of hydrofluoric acid to etch the ceramic and a silane coupling agent to bond a resin luting agent to the ceramic.
a.) Composite bonded ceramics b.) Resin-Bonded Ceramics
c.) Resin De-bonded Ceramics
d.) lonomer-Bonded Ceramics
B
In an All-Ceramic fabrication,additional firing is needed to compensate for?
a.) Breakage
b.) Leakage
c.) Shrinkage
d.) Shade translucency
C
Zirconia is considered an excellent material of choice for foundation restoration (post & core) for this reason;
a.) Overcome esthetic problem associated with metal post
b.) Overcome strength problem associated with metal post
c.) Both A and B
d.)None of the above
C
The core material for an all-ceramic Foundation Restoration can either be made of except
a.) Composite resin
b.) Pressable ceramic
c.) Zirconia
d.) Cast alloy
D
8.For feldspathic and leucite-reintorred ceramic resin bonding is the recommended procedure
a.) True
b.) False
A
One concern with ceramic restoration is the potential for abrasion of the opposing enamel particularly in patients with parafunctional habits.
a.) true
b.) false
A
The most difficult challenge in fixed prosthodontics with the available ceramic system is selecting material that will provide the best esthetics for particular patients.
a.) true
b.) false
A
The Dentist can evaluate the internal and marginal adaptation of the prosthesis before restoration bonded with using elastomeric detection paste
a.) True
b.) False
A
Type of all-ceramic materials that have higher strength
a.) Monolithic Zirconia
b.) Lithium disilicates
c.)AandB
d.) None of the above
C
All-ceramic crown does have slightly inferior marginal adaptation than does a metal ceramic crown.
a.) True
b.) False
A
14.The first sheet adapted to a die and fired in producing a coping In the Captek System:
a.) True
b.) False
A
Type of ceramic crown fabrication which offers excellent esthetics and marginal adaptation.
a.) Gold-aluminum-palladium
b.) Gold-titanium-palladium
c.) Gold-platinum-palladium
d.) Gold-platinum-pandemonium
C
Because it is a metal reinforced system, in strictest term Captek is a metal ceramic crown as opposed to all ceramic crowns.
a.)True
b.)False
A
IPCs with the first fully dense net -shape ceramic available for dental restorations based on 68% alumina infiltrated with lanthanum-containing glass
a.)VITA enamic
b.) In-ceram alumina
B
The 2nd IPC for dental restorations that is based on initial sintering of porcelain powder to approximately 70% of full density, followed by infitration with dental monomers
a.) In-Ceram Alumina
b. VITA Enamic
c.)VITA
B
Chemical formula of Iithium disilicate
a.) L2SiO3
b.) L2Si2O5
B
Zirconia ceramics used for dental restorations
a.)Tetragonal zirconia stabilized with 8 mol% yttrium oxide
b.)Tetragonal zirconia stabilized with 3 mol% attrium oxide
c)Tetragonal zirconia stabilized with 3 mol% yttium oxide
C
Esthetic superiority is the collarless crown’s most obvious advantage over conventional metal ceramic restoration.
a.)False
b.)True
B
22.The most common objection of patients associated with metal-ceramic restorations;
a.)Redness at the margin
b.)Yellowish margin
c.) Purpling of the margin
d.) Grayness at the margin
D
Best description of a collarless metal-ceramic crown;
a.)The facial margin is metal, and the lingual and proximal margins are porcelain
b.)The facial margin is porcelain,and the lingual and proximal margins are metal
c.)The facial margin,and the lingual and proximal margins are porcelain
d.)All margins are metal
e.)None of the above
B
24.The margin design sulted for a 360-degree porcelain margin on a metal ceramic restoration?
a.)Circumferential shoulder margin with acute internal line angles
b.)Circumferential chamfer margin with rounded internal line angles
c)Circumferential shoulder margin with rounded internal line angles
d.)Labial and proximal shoulder margins with rounded internal line angles and chamfer on lingual surface
C
25.A porcelain labial margin is indicated when a conventional metal-ceramic restoration will not create the desired esthetic result.
a) true
b) false
A
Porcelain labial margin is contraindicated when an extremely smooth,1-mm-wide shoulder margin cannot be prepared in the area of the ceramic veneer.
a)False
b) Ture
c)True
d)Falls
C
Marginal adaptation of a porcelain mangin is slightly inferior to that of cast metal.
a.) True
b.)Fast
c.)Defective statement
A
28.The reason why bubbles appear on the metal ceramic restoration?
a) Too many firings
b.) Air entrapment during build-up of restoration c.)Improper moisture control
d.)Poor metal preparation
e.)All of the above
E
29.Common cause of clinical fracture of metal-ceramic restorations?
a) Poor framework design
b) Centric stops too close to metal-ceramic interface
c) Improper metal preparation d)AandC
e) All of the above
E
The metal-ceramic restoration first became available commercially at this period of time
a. Late 1950s
b. Early 1950s
c. End of 1800s
d. When Pierre Fauchard attempted its use
in dentistry
B
31.The Intended metal-ceramic junction In the preparation of metal for PFM restoration;
a. Less than 90-degree and smooth
b. 90-degree angle and smooth
c. None of the above
d. All of the below
B
The metal framework must be thick enough to avoid distortion during firing. A minimum thickness of 0.3mm is advocated for noble metal.
a. Both statements are true and correct
b. Both statements are false and incorrect
c. First statement is true and the second
statement is false
d. First statement is false and the second
statement is true
A
The minimum thickness of metal framework
for base restoration;
a. 0.3 mm
b. 3.0 mm
c. 0.2 mm
d. 0.2 cm
e. 2.0 mm
C
The metal ceramic interface must be far away (ideally at least ______) from all centric occlusal contacts
a. 1.5cm
b. 0.15 mm
c. 1.5mm
d. 0.5mm
C
The use of this substance dissolves the refractory silica component of the investment material
a. Phosphoric Acid
b. Hydrofluoric acid
c. Turmeric acid
d. Prosthophilic acid
e. None of the above
B
Careful metal preparation is essential before porcelain application. What is the correct way to prepare the veneer area?
a. The metal should be ground in multiple direction to flush debris on high-noble alloys
b. The metal should be ground in same direction
c. Grind the metal multidirectional
d. None of the above
B
The classification of dental ceramics that has a fusing range of 1290°C to 1370°°C?
a. Medium-fusing
b. High-fusing
c. Low-fusing
B
The fusing range for a medium-fusing dental ceramics?
a. 1290°C to 1370°C
b. 1090°C to 1260°C
c. None of the above
B
Metal-ceramic veneer restorations are fired in the range of?
a. 950°C to 1020°C
b. 1290°C to 1370°C
c. None of the above
A
