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BDS3 Clinical Endo > Session 4 > Flashcards

Session 4 Flashcards

(52 cards)

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1
Q

What are the design objectives for endodontics? (3)

A
  • Create continuously tapering funnel shape
  • Maintain apical foramen in original position
  • Keep apical opening as small as possible
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2
Q

What is the sequential process of endodontic treatment? (5)

A
  • Coronal access to the root canal system
  • Root canal instrumentation and preparation (shaping of the canal)
  • Obturation of the root canal system
  • Coronal seal
  • Final restoration
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3
Q

In terms of access what is essential for successful endodontics?

A
  • Good access is essential

- Without good access we will not have adequate access to obtain good instrumentation and irrigation to occur

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4
Q

What is the access cavity shape for a maxillary 1st premolar?

A
  • Ovoid access cavity

- Because generally there is a couple of roots with predominance of 2 canals - one in each root

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5
Q

What % of maxillary 1st premolars have 1 canal?

A

6%

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6
Q

What % of maxillary 1st premolars have 2 canals?

A

93%

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7
Q

What % of maxillary 1st premolars have 3 canals?

A

1%

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8
Q

What is the access cavity shape for a maxillary 2nd premolar?

A
  • Ovoid access
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9
Q

What % of maxillary 2nd premolars have 1 canal?

A

75%

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10
Q

What % of maxillary 2nd premolars have 2 canals?

A

24%

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11
Q

What % of maxillary 2nd premolars have 3 canals?

A

1%

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12
Q

What is the access cavity shape for a maxillary first molar?

A
  • Access cavity tends to be more mesially placed and is a quadrilateral shape to allow you to gain access to the MB2
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13
Q

How many roots do we tend to have in a maxillary first molar?

A

Tend to have 3 roots

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14
Q

What % of maxillary first molars have 3 canals?

A

7%

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15
Q

What % of maxillary first molars have 4 canals?

A

93%

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16
Q

Which root of a maxillary 1st molar tends to have 2 canals?

A
  • The mesio-buccal root
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17
Q

What is the access cavity shape like for a maxillary 2nd molar?

A
  • Quadrilateral/triangular shape - slightly more mesially positioned and allows us to get access to the root canal system
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18
Q

How many roots are there in a maxillary 2nd molar?

A
  • 3 roots
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19
Q

What % of maxillary 2nd molars have 3 canals?

A

63%

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20
Q

What % of maxillary 2nd molars have 4 canals?

A

37%

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21
Q

Which root of a maxillary 2nd molar tends to have 2 canals?

Study These Flashcards
A

The mesio-buccal root

22
Q

How many roots does a mandibular 1st premolar usually have?

23
Q

What % of mandibular 1st premolars have 1 root canal?

24
Q

What % of mandibular 1st premolars have 2 root canals?

25
How many roots does a mandibular 2nd premolar usually have?
1
26
What % of mandibular 2nd premolars have 1 root canal?
85%
27
What % of mandibular 2nd premolars have 1 root canal?
15%
28
How many roots does a mandibular 1st molar usually have?
2-3
29
What % of mandibular 1st molars have 3 root canals?
67%
30
What % of mandibular 1st molars have 3 root canals?
33%
31
What is Radix Entomolaris?
The presence of an additional distobuccal root in the mandibular molars
32
How many roots does a mandibular 2nd molar usually have?
2
33
What % of mandibular 2st molars have 2 root canals?
13%
34
What % of mandibular 2nd molars have 3 root canals?
79%
35
What % of mandibular 2nd molars have 4 root canals?
8%
36
If a root canal treatment isn't going to plan what should you do?
- If it isn't going to plan - stop, reassess and maybe modify depth, position or angulation
37
What is one danger when de-roofing a pulp chamber?
- You can damage the floor of the pulp chamber | so we use safe ended burs
38
How do we remove the pulp roof with an endo Z bur?
- Remove using lateral movement
39
What does safe removal of roof of pulp chamber to gain access to all canals provide a reservoir for?
- Provides a reservoir for irrigants during instrumentation
40
How do we get straight line access?
- Once we have identified the orifice have to then ensure we have straight line access - Often have a lip of dentine that is present just at the lip of the orifice that is going to interfere potentially with developing straight line access - So what we have to do is look at modifying the dentinal wall so we can improve straight line access - Straight line access is straight access to the first point of curvature or the apex - whichever comes first
41
What happens if we don't gain straight line access?
- If don't develop SLA - we put increased stress on the instrument which may lead to deformation or fracture but also then risk mishaps in canal shaping such as ledges or perforations
42
What bur would we use to improve straight line access?
- Gates Glidden burs - Don't use a gates 1 bur but can use 2, 3, 4 etc - Don't go too deep into the canal with these
43
What is the tip size of a gates-glidden 1?
0.7
44
What is the tip size of a gates-glidden 2?
0.9
45
What is the tip size of a gates-glidden 3?
1.10
46
What is the tip size of a gates-glidden 4?
1.30
47
What is the tip size of a gates-glidden 5?
1.50
48
What is an X-gate bur?
- Combination of GG burs | - Allows us to make a shape but with a single instrument
49
What GG size is equivalent to the tip size of an X-gate?
- Gates 1
50
What GG size is equivalent to the maximum diameter of an X-gate?
- Gates 4
51
What GG size is equivalent to the shank of an X-gate?
- Gates 3
52
Where is the point of weakness on an X-gate bur?
- At the end of the shank furthest away from the tip

BDS3 Clinical Endo (6 decks)

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