Past MCQ

Question 1

At what temp does feldspathic ceramic form leucite?

Answer 1

• 1150-1500degrees C

Question 2

What is Leucite?

Answer 2

• Potassium aluminium silicate

Question 3

What is PROCERA?

Answer 3

• > 99% alumina core
• Produced at about 1700 celcius

Question 4

What temp is Zirconia sintered at?

Answer 4

• 1600C

Question 5

What is the max amount of strain porcelain will undergo before fracture?

Answer 5

• 0.5%

Question 6

What is the expansion of gold ?

Answer 6

• 1.4%

Question 7

What is the expansion of Ni/Cr?

Answer 7

2.0%

Question 8

What is the expansion of Co/Cr?

Answer 8

2.3%

Question 9

What is the longevity of GIC, SSC and Amalgam?

Answer 9

SSC = 92%
Amalgam = 80%
GIC = 66%

Question 10

What are the reasons and % for post core failures?

Answer 10

• 60% due to restorative
• 32% due to perio
• 8% due to endo

Question 11

What are some temp materials used?

Answer 11

PMMA:Jet
PEMA: Snap / TRIM
Bis-acrylate composite : Protemp
UDMA : Provipont

Question 12

What material has best mechanical properties for restoration of occlusal surfaces?

Answer 12

• Gold

Question 13

What is the best method for retaining a core ?

Answer 13

• Use of adhesive only

Question 14

When preparing upper first permanent molar for metal-ceramic crown, a functional bevel is placed on which cusp?

Answer 14

• Mesio-palatal

Question 15

What is the correct degree of axial-taper in ideal crown prep?

Answer 15

• 7degrees

Question 16

The fit surface of a porcelain laminate veneers is prepared with what acid?

Answer 16

• Hydrofluoric acid