Lec 12 Prefabricated dowel with amalgam or resin core

Question 1

Are the most commonly used dowel cores today.

Answer 1

Prefabricated dowels with amalgam or composite resin cores

Question 2

Provides greater strength.

Answer 2

Amalgam

Question 3

Remains popular because it is easily placed, polymerizing in minutes and allowing work on the core preparation to progress almost immediately

Answer 3

Composite resin

Question 4

Resin requires less bulk of material than does amalgam, which makes it useful on ______- teeth.

Answer 4

small teeth

Question 5

Dowels can be made of? (Give an example).

Answer 5

• stainless steel, titanium, brass, or a chromium-containing alloy.
• in recent years: carbon pyrolite fiber and fiberglass

Question 6

________ dowels have also been advocated for use in anterior teeth where ______ dowels could lead to darkening of the root and overlying gingiva.

However, neither type of dowel is recommended for use with ________.

Answer 6

• Ceramic
• metal
• resin cements.

Question 7

The preferred materials in light of current knowledge of galvanism and corrosion are ___________ alloys.

The least desirable are ____________.

Prefabricated dowels are made in both _________ and _________ configurations.

Answer 7

• titanium, high platinum, and cobalt-chromium-molybdenum
• brass and chromium-nickel steel
• parallel-sided and tapered configurations

Question 8

Dowel systems can be classified by their mechanism of retention: (2)

Answer 8

passive (cemented)
active (threaded)

Question 9

Passive dowel systems are also called as?

Answer 9

Cemented dowels

Question 10

Active dowel systems are also called as?

Answer 10

Threaded dowels

Question 11

The ______ dowels are more retentive than the cemented, but they also produce more stress in the tooth.

Answer 11

threaded (active) dowels

Question 12

A ____________ is measured against a radiograph of the tooth being restored to determine the length to which the instrument (and later, the dowel) will be inserted into the canal.

Answer 12

Peeso reamer

Question 13

In the area of greatest bulk between the canal and the periphery of the tooth, one or two 0.6-mm pinholes are drilled to a depth of?

Answer 13

2.0 mm

Question 14

A __________ is used to ensure that the walls of the canal are completely coated with cement. Retention can be increased by as much as 90% if it is used.

Answer 14

Lentulo spiral (Dentsply)