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Restoration of endodontic teeth: An engineering perspective
by Gregori M. Kurtzman, DDS, MAGD, FAAIP, FPFA, FACD, FADI, DICOI, DADIA

1.  What is a ferrule in dentistry?

the circumferential band of tooth that the crown terminates on

the circumferential band of tooth and restorative material the crown terminates on

the margin of the crown

not needed in adhesive dentistry

2.  Presence of a ferrule serves the purpose of?

makes it easier for the laboratory technician to fabricate the crown

allows stress to be concentrated in the cervical region and not the root

distributes stress into the root decreasing fracture potential

convenience form for the crown preparation

3.  The margin preparation design recommended is?

chamfer

shoulder

modified shoulder

feather edge

a and c

4.  When treating a tooth endodontically?

maintain as much tooth structure as possible while making access the needed size

make the access as large as possible to be able to perform the endodontics

make the access as small as possible when performing endodontics

remove most of the coronal tooth to allow straight line access to the canals

5.  Fatigue loading of post and cores with crowns of different ferrule heights provide evidence to support the need for at least a ferrule of?

0.5mm

1.0 mm

1.5mm

2.0 mm

6.  A tooth with a 0.5mm ferrule when loaded off axis will show greater strain?

In the coronal

In the cervical area

In the mid root

In the apical

7.  During off axis loading what may be observed?

compression is observed on the opposite site of the applied load

tension is observed on the side of the applied load

the margin on the tension side may open leading to recurrent decay

all of the above

8.  Which post material has a modulus of elasticity closest to dentin?

Cast metal

Stainless steel

Fiber

Ceramic

9.  A tooth that has minimal missing tooth structure and both proximal surfaces intact can be restored with?

bonded composite as the final restoration

inlay

onlay

full coverage crown

10.  When a tooth containing a metallic post is over loaded what may happen?

fracture of the post at the cervical level

fracture of the tooth at the apical level

post may dislodge from the tooth with no change to the root

vertical root fracture along the post

b and d

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