Endo treated teeth P1

Question 1

What is the main goal of restoring endodontically treated teeth?

Answer 1

To ensure the tooth can resume full function and resist occlusal forces.

Question 2

Why is cuspal coverage recommended for endodontically treated teeth?

Answer 2

To protect the weakened tooth structure from fracture.

Question 3

How does loss of tooth structure affect endodontically treated teeth?

Answer 3

It reduces the tooth’s ability to resist occlusal forces.

Question 4

What is a post crown?

Answer 4

A full coverage crown that gains retention by a post inserted in the root canal.

Question 5

What materials are used for posts in post crown systems?

Answer 5

Metallic (e.g., alloys), ceramic (e.g., zirconium oxide), or fiber-reinforced resin.

Question 6

What is the purpose of a core in a post crown system?

Answer 6

To rebuild the lost coronal tooth structure and provide the shape for extracoronal restoration.

Question 7

What is an extracoronal restoration?

Answer 7

A restoration that restores the esthetics and function of a tooth, typically a crown.

Question 8

When is a post crown indicated?

Answer 8

For severely damaged endodontically treated teeth or as retainers for short span bridges.

Question 9

What is a contraindication for a post crown?

Answer 9

Presence of periapical pathology or insufficient periodontal support.

Question 10

What are the advantages of a post crown?

Answer 10

Provides good retention, strengthens the tooth, and allows correction of malalignment.

Question 11

What is the main disadvantage of a post crown?

Answer 11

It can weaken the root if the canal is improperly prepared or over-widened.

Question 12

How are post and core systems classified by material?

Answer 12

Metallic, combination of metal and non-metal, or all non-metal.

Question 13

What is the function of a ferrule in tooth preparation?

Answer 13

To reduce stress concentration and prevent root fracture during function.

Question 14

What factors influence retention of a post crown?

Answer 14

Preparation geometry, post design, length, diameter, surface, and luting agents.

Question 15

Why is a parallel-sided post more retentive than a tapered one?

Answer 15

Parallel walls provide more surface area for retention.

Question 16

How does post length affect retention?

Answer 16

Increased post length improves retention but may risk perforation if too long.

Question 17

What are the disadvantages of using a thick post?

Answer 17

It may weaken the root and lead to fractures.

Question 18

What is the purpose of using a serrated post?

Answer 18

To increase retention by providing more surface area for bonding.

Question 19

Why is the apical seal important during post placement?

Answer 19

It prevents leakage and maintains the integrity of the root canal filling.

Question 20

What is the impact of improper canal preparation on post crown longevity?

Answer 20

It can weaken the root and increase the risk of post failure or root fracture.

Question 21

How should gutta-percha be removed when preparing for a post?

Answer 21

Using a hot instrument, Peeso reamers, or rotary instruments with care to avoid apical seal damage.

Question 22

Why is minimal canal enlargement important?

Answer 22

To maintain root strength and prevent perforation.

Question 23

When is a custom-made cast post preferred?

Answer 23

In non-circular or highly tapered canals where prefabricated posts do not fit well.

Question 24

What is the advantage of prefabricated posts?

Answer 24

They are easy to use and require minimal adjustment for fitting.

Question 25

What are the main steps for preparing the coronal structure for a post crown?

Answer 25

Remove undercuts, preserve as much tooth as possible, and ensure parallel preparation.

Question 26

Why is a ferrule important in post crown restorations?

Answer 26

It helps bind the remaining tooth structure together, reducing the risk of fracture.

Question 27

What material is used for a direct wax pattern?

Answer 27

Blue inlay wax.

Question 28

Why is a direct resin pattern technique used?

Answer 28

To create a customized post pattern inside the canal for precise fit.

Question 29

What is the purpose of a plastic burnout post?

Answer 29

To create a pattern for the final cast post by burning out the plastic material.

Question 30

How does stress distribution affect post crown success?

Answer 30

Even stress distribution prevents root fracture and post failure.

Question 31

What are the advantages of using a core material like amalgam or composite?

Answer 31

Conserves tooth structure, reduces lab procedures, and requires fewer patient visits.

Question 32

What is a major disadvantage of composite core materials?

Answer 32

Continued polymerization can cause microleakage and weakening over time.

Question 33

Why is a post usually unnecessary for molars?

Answer 33

The pulp chamber can provide sufficient anchorage for a core buildup.

Question 34

What is the best canal for placing a post in mandibular molars?

Answer 34

The distal canal.

Question 35

What are the risks of placing a post in the mesial canal of mandibular molars?

Answer 35

Perforation due to the thin distal wall of the mesial root.

Question 36

How is retention increased in post design?

Answer 36

Through the use of threads or serrated surfaces.

Question 37

Why should sharp angles be avoided in post preparations?

Answer 37

Sharp angles concentrate stress and increase the risk of fractures.

Question 38

How does canal geometry affect post retention?

Answer 38

Canals with parallel walls and minimum taper provide better retention.

Question 39

Why is a post and core preferred for severely damaged teeth?

Answer 39

It provides retention for the final restoration and reinforces the tooth structure.

Question 40

What is the role of luting agents in post retention?

Answer 40

To cement the post and provide additional retention if the post fit is not ideal.

Question 41

What factors contribute to post and crown failure?

Answer 41

Inadequate retention, improper post length or diameter, and poor stress distribution.

Question 42

Why is post diameter critical in preparation?

Answer 42

A post that is too thick can weaken the remaining root structure.

Question 43

What is the purpose of a collar in post retention?

Answer 43

To increase retention and prevent rotational forces on the post.

Question 44

How is a post and core system classified by attachment?

Answer 44

Attached (one-piece) or detached (two or three-piece restoration).

Question 45

Why are prefabricated posts more commonly used than custom-made posts?

Answer 45

They are quicker and simpler to use with standardized shapes and sizes.

Question 46

What is the benefit of using adhesive resin cements for post retention?

Answer 46

They provide higher bond strength and better sealing compared to traditional cements.

Question 47

How does post length relate to crown height in post placement?

Answer 47

The post should be at least as long as the occluso-gingival height of the crown.

Question 48

Why is it important to preserve as much coronal tooth structure as possible?

Answer 48

To reduce stress concentration and improve the retention of the restoration.

Question 49

What is the risk of using a post in a very narrow root canal?

Answer 49

Increased chance of root perforation and weakening.