3BDS: Endodontics 9

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what is the most imprints factors in enabling efficient and effective root canal preparation (shaping and disinfection) and obstruction
a correct sized and sited access cavity
1 of 18
what are the principles of access cavity design ?
• Allow removal of roof pulp chamber and pulp horns
• Allow direct vision of pulpal floor and canal orifices
• Avoid damage to pulpal floor or perforation
• Allow straight -line access into canals
• Provide retention for placement of a temporary. Resto
2 of 18
what bur is used to cut the initial online form?
small round diamond bur
3 of 18
how deep should the initial outline be?
1mm into enamel
4 of 18
what is the long fissure diamond used for?
to deepen the access towards the roof of the pulp chamber and to penetrate the roof whilst avoiding perforation
5 of 18
how many degrees and in what direction is the long fissure diamond used
45 degrees, to the palatal surface until we reach midpoint and then we change our angulation so we're heading in the direction of the pulp
6 of 18
what do we use to through metal crowns?
tungsten carbide bur
7 of 18
what do we use to cut through metal ceramic crowns?
small diamond bur to cut through the porcelain part then when metal is exposed change to tungsten carbide bur
8 of 18
the long shank slow speed is used to:
- penetrate through (remove) the roof of the pulp chamber
- remove palatal shelf in upper anterior teeth
- careful exploration of pulpal floor to uncover narrow canal orifices
9 of 18
what is the normal shank bur used for
removal of caries
10 of 18
once you have removed the roof of the pulp chamber and established your basic shape you want to finish everything off using a
non-end cutting ‘high speed’ bur
11 of 18
the non-end cutting high speed bur is used also after...
completion of access to flare, flatted and finish axial walls
12 of 18
for a maxillary central and lateral incisor the shape is a triangle, where would the base and apex be
base towards incisor edge, apex towards gingival margin
13 of 18
1 stage- Initial outline, what is it dependent on? where is the shape and what is the size? what is the depth into the enamel
This is dependent on the tooth type
Shape: position of canal orifice and pulp horns
Size (depends on the size of pulp. If it’s a young patient with a large pulp then the size of access cavity is much larger than if it was an older patient with a narrow R
14 of 18
penetration stage- what do you do with the fissure bur
go along the long axis of the tooth, penetrate the pulp chamber by breaking through the roof with a bur
15 of 18
what is the enlargement stage performed with. what is the advantage of this
Performed with a long shanked round bur on a low- speed handpiece: improves penetration and visibility
16 of 18
what do you use for the finishing and flaring stage
Using a non-end cutting high speed diamond bur to smooth the walls of the access cavity
This allows the walls to be finished without damaging the floor of the pulp chamber
17 of 18
how many canals in second premolar
one central canal or you actually have two separate canals both buccally or palatally placed
18 of 18

Other cards in this set

Card 2

Front

what are the principles of access cavity design ?

Back

• Allow removal of roof pulp chamber and pulp horns
• Allow direct vision of pulpal floor and canal orifices
• Avoid damage to pulpal floor or perforation
• Allow straight -line access into canals
• Provide retention for placement of a temporary. Resto

Card 3

Front

what bur is used to cut the initial online form?

Back

Preview of the front of card 3

Card 4

Front

how deep should the initial outline be?

Back

Preview of the front of card 4

Card 5

Front

what is the long fissure diamond used for?

Back

Preview of the front of card 5
View more cards

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