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Restorative > Resto Endo Interface + Resto of Endo Tooth > Flashcards

Resto Endo Interface + Resto of Endo Tooth Flashcards

1
Q

What to assess in RCT

A

When
How
Acceptable - leaking?
If not sure dam/hypo = redo

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2
Q

Ideal features of post design

A
  • Parallel sided (avoids wedging)
  • Non threaded (avoids stress)
  • Cement retained (distributes masticatory forces evenly, cement act as buffer between post + tooth)
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3
Q

Disadvantage of tapered posts

A

Wedging
Root fracture risk unlike parallel

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4
Q

What to use to remove GP

A

GG 3
Straight part of canal only
WL + rubber stops

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5
Q

Lab prescription for cast post + core

A

Please construct cast post + core
Parapost colour
Core 6 degree taper
Please leave 2mm space in occlusion for crown

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6
Q

Methods of post removal (5)

A

Ultrasonic
Moskito forceps
Sliding hammer
Masseran kit
Eggler device

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7
Q

Potential issues encountered when removing post

A

Root fracture
Break the post
Post space too wide

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8
Q

Core materials for posterior teeth

A

Composite
Amalgam
GI

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9
Q

Contraindications for posts

A

Narrow root
May lead to strip or lateral perforation
If not at least 1mm ferrule

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10
Q

If molars must be used what roots should be used?

A

Distal roots of mandibular molars

Palatal roots of maxillary molars (large + straight)

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11
Q

Function of cuspal coverage

A
  • Prevents coronal micro leakage (coronal seal)
  • Prevents fracture through buccal wall
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12
Q

When would we consider a post in a premolar?

A

Long bulky + straight roots

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13
Q

Clinical exam of endo tx tooth (9)

A
  • Coronal seal - leakage/caries
  • Amount of remaining structure for ferrule
  • Restorability
  • Can it be isolated
  • Swelling
  • Sinus
  • TTP
  • Mobility
  • Increase in pocketing (sign of perio + root fracture)
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14
Q

Radiographic exam of endo tx tooth (8)

A
  • Root filling length
  • Quality of obturation/voids
  • Unfilled canals
  • Shape of canal
  • Patency
  • Bone levels
  • Crown: root ratio
  • PA pathology
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15
Q

Define coronal micro leakage

A

Ingress of microorganisms into RC system
Cause of RCT failure

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16
Q

Protocol for exposed GP >3mths

A

Redo RCT

17
Q

Function of cuspal coverage

A

Prevents coronal micro leakage - inc survival rate

Prevents fracture through furcation or buccal wall (imp in high stress areas)

18
Q

Restoration choice for intact marginal ridge

A

Direct composite resto

19
Q

Restoration choice for intact marginal ridge +/- discoloured crowns

A

Direct composite resto
Bleaching and/or veneer

20
Q

Restoration choice for marginal ridge destroyed

A

Core build up with crown

21
Q

Function of post+core

A

Gain inter-radicular support for definitive restorations

Core = retention for crown

Post = retains core

22
Q

Effect of post prep on tooth

A

Weakens by 68%

23
Q

Do we need a post in incisors/canines?

A

No unless insufficient coronal dentine

But core will require post as single root canal = inadequate to retain core

24
Q

Why do we avoid a post in mandibular incisors?

A

Thin tapering narrow m d roots

25
Q

Why do we avoid placing posts in curved canals?

A

Perforation risk

Place in widest RC

26
Q

Post prep steps

A

Root filling 4-5mm apically

Post width no more than 3rd width at narrowest point
Minimum 1:1

1-2mm of dentine

27
Q

Core build up taper

A

6 degree taper
2mm sub gingival filling

28
Q

Core materials

A

GI
Composite
Amalgam

29
Q

Adv / disadvantage of composite core (used with fibre post)

A

ADV
- Tooth colour for aesthetics
- Bonds to tooth

DISADV
- Moisture control

30
Q

Disadvantage of amalgam core

A
  • Retention required (tooth removal)
  • Fracture risk
  • Poor aesthetics
  • Needs 24hrs to set
31
Q

Disadvantage of GI core

A

Absorbs water core expands

32
Q

Properties of a Nayyar core (4)

A

2-4mm GP removed from canal

AM packed into RC + tooth built

Retention from undercuts

Can’t be prepared for 24hrs until amalgam sets

33
Q

Post issues (4)

A

Root fracture

Post fracture

Core fracture

Perforation

34
Q

Highest reason for post crown failure

A

Restorative problems

Restorative (8 decks)

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