Question 1

If a ceramic crown repeatedly fractures on the facial incisal of tooth #8. the MOST likely cause is tooth preparation with which of the following?

Options :

A : Rounded incisal edge

B : Minimal chamfer finish line

C : Nearly uniform reduction of 1.5 mm

D : Taper of 8 degrees

Answer: B

Question 2

What minimum distance is needed between an implant and the root of a tooth in order to keep the tooth's bony attachment intact and prevent horizontal bone loss?

Options :

A : mm

B : mm

Answer: B

Question 3

How can fracture toughness be described?

Options :

A : A measure of material resistance to rapid crack propagation

B : A quantitative analysis of ceramic wear

C : A poor indicator of a material clinical reliability

D : A recent enhancement by the addition of glass to ceramic materials

Answer: A

Question 4

Which of the following is correct concerning tooth preparation for diastema closure with bonded porcelain restorations?

Options :

A : Keep all margins supragingival or equigingival

B : Full crown preparations are best used to close spaces

C : Subgingival interdental margins will allow for improved emergence profiles

D : Mini-wings must always be used to close a black triangle interdentally

Answer: C

Question 5

Of the following, what is the BEST treatment for a Class IV fracture of a lateral incisor with no pulp exposure and otherwise healthy teeth?

Options :

A : Bonding: this is the most conservative treatment for a Class IV fracture of this tooth

B : Provisional: this will allow you to assess the tooth-s long-term nerve health

C : Porcelain Jacket Crown: this will allow you to most closely match the adjacent teeth

D : Lithium disilicate crown: this provides the best complement of strength and esthetics

Answer: C

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