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iodc > posterior access and instruments > Flashcards

posterior access and instruments Flashcards

1
Q

What is the MBD rule?

A

When tube moves Mesial, Buccal canal moves to Distal of image

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2
Q

How should you do a clinical assessment?

A

Caries
Restoration
Structural durability
Rotation/tilting
Mobility
Perio pocketing
Mucosa status
TTP
Colour change

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3
Q

What is the preliminary tx?

A

Restore caries/defective restorations
Dismantle coronal restorations (if appropriate)- new core build up/provisional

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4
Q

How should the access be prepared?

A

No undercuts
Smooth axial walls (tapered)
All canal orifices visible
Allows safe irrigation/ease of shaping
Straightens out curves to determine accurate WL

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5
Q

What are common mistakes of access?

A

Orientation and depth gauging (measure on radiograph)

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6
Q

What is the morphology of upper premolars?

A

Oval shaped access
Narrower in mesio distal, wider in buccal palatal
2 canals
Deep pulp chambers

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7
Q

What is the morphology of lower premolars?

A

30% have 2 canals
Usually lingual canal missed
Oval shaped
Deep pulp chamber

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8
Q

What is the morphology of upper first molars?

A

4 canals
MB1 furthest corner
MB2 between MB1 and P, slightly mesial
Trapezoidal shaped access

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9
Q

What is the morphology of upper second molars?

A

3 canals
Trapezoidal shaped access
May have MB2 also

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10
Q

What is the morphology of the lower molars?

A

3/4 canals
2 mesial canals and 1/2 distal canal (if small 2, if large 1)
More towards mesial

4 canals for lower second molar

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11
Q

What instruments are used?

A

Endo probe/explorer- angled for access
Long shank Rosehead burs
Small mirrors
Magnification- loupes useful (2.5x good start)

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12
Q

What is an example of cutting an access through a PFM?

A

Porcelain- diamond round bur
Metal- tungsten carbide bur
Dentine- longshank rosehead bur
Deroof- endo Z bur (safe tipped) tungsten carbide

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13
Q

What is strip perforation?

A

Files have tendency to straighten canals out
Will preferentially file on convex surface
As canal straightens, WL shortens

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14
Q

What is anti-curvature filing?

A

Preferential filing away from high risk areas (on concave surface instead)

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15
Q

Why do you need to be careful with Gates glidden?

A

Will create circular shape even if not circular- may perforate

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16
Q

Why are pulp stones important?

A

May be mobile or not
Can be hard tissue attached to dentine
May need to use long shank to remove

iodc (63 decks)

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