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Fixed II > Endo treated teeth P1 > Flashcards

Endo treated teeth P1 Flashcards

1
Q

What is the main goal of restoring endodontically treated teeth?

A

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

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2
Q

Why is cuspal coverage recommended for endodontically treated teeth?

A

To protect the weakened tooth structure from fracture.

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3
Q

How does loss of tooth structure affect endodontically treated teeth?

A

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

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4
Q

What is a post crown?

A

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

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5
Q

What materials are used for posts in post crown systems?

A

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

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6
Q

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

A

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

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7
Q

What is an extracoronal restoration?

A

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

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8
Q

When is a post crown indicated?

A

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

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9
Q

What is a contraindication for a post crown?

A

Presence of periapical pathology or insufficient periodontal support.

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10
Q

What are the advantages of a post crown?

A

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

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11
Q

What is the main disadvantage of a post crown?

A

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

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12
Q

How are post and core systems classified by material?

A

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

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13
Q

What is the function of a ferrule in tooth preparation?

A

To reduce stress concentration and prevent root fracture during function.

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14
Q

What factors influence retention of a post crown?

A

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

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15
Q

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

A

Parallel walls provide more surface area for retention.

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16
Q

How does post length affect retention?

A

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

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17
Q

What are the disadvantages of using a thick post?

A

It may weaken the root and lead to fractures.

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18
Q

What is the purpose of using a serrated post?

A

To increase retention by providing more surface area for bonding.

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19
Q

Why is the apical seal important during post placement?

A

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

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20
Q

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

A

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

21
Q

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

A

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

22
Q

Why is minimal canal enlargement important?

A

To maintain root strength and prevent perforation.

23
Q

When is a custom-made cast post preferred?

A

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

24
Q

What is the advantage of prefabricated posts?

A

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

25
Q

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

A

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

26
Q

Why is a ferrule important in post crown restorations?

A

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

27
Q

What material is used for a direct wax pattern?

A

Blue inlay wax.

28
Q

Why is a direct resin pattern technique used?

A

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

29
Q

What is the purpose of a plastic burnout post?

A

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

30
Q

How does stress distribution affect post crown success?

A

Even stress distribution prevents root fracture and post failure.

31
Q

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

A

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

32
Q

What is a major disadvantage of composite core materials?

A

Continued polymerization can cause microleakage and weakening over time.

33
Q

Why is a post usually unnecessary for molars?

A

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

34
Q

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

A

The distal canal.

35
Q

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

A

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

36
Q

How is retention increased in post design?

A

Through the use of threads or serrated surfaces.

37
Q

Why should sharp angles be avoided in post preparations?

A

Sharp angles concentrate stress and increase the risk of fractures.

38
Q

How does canal geometry affect post retention?

A

Canals with parallel walls and minimum taper provide better retention.

39
Q

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

A

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

40
Q

What is the role of luting agents in post retention?

A

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

41
Q

What factors contribute to post and crown failure?

A

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

42
Q

Why is post diameter critical in preparation?

A

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

43
Q

What is the purpose of a collar in post retention?

A

To increase retention and prevent rotational forces on the post.

44
Q

How is a post and core system classified by attachment?

A

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

45
Q

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

A

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

46
Q

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

A

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

47
Q

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

A

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

48
Q

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

A

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

49
Q

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

A

Increased chance of root perforation and weakening.

Fixed II (4 decks)

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