locating mb2 - 牙齒保健

某網站上看到的(Endodontic Therapy);請問一下以下步驟在實務根管經驗上有落差嗎?

1.Road Map.

Using a rhomboid access,
follow the road map that the developmental grooves form on the pulpal floor.
The MB2 canal is palatal and often mesial (under the marginal ridge) to a
line drawn between the MB1 and palatal canal.

2. Remove Mesial Shelf.

After locating the MB1 canal, remove the mesial dentin shelf which represents
the roof of the pulp chamber over-lying the MB2 orifice. Enter the MB2 canal
from a flat pulpal floor angling a precurved file from the distal toward the
mesial.

3. Highlight.

Use stains (eg, 1% methylene blue or dentin powder created by drilling) to
highlight the pulp chamber anatomy.

4. Trough.

Trough and search with low-speed burs or ultrasonic tips, beginning from the
MB1 orifice. Also try not to exceed a depth of 2 mm to 3 mm as this could
weaken the mesial furcation.

5. Bubble Test.

A bubble test with sodium hypochlorite in the pulp chamber may be helpful
in detecting organic tissue within the MB2 canal.

6. Chelate.

Chelating agents (ie, EDTA) can assist in removing the smear layer and
softening calcifications inside the pulp chamber, allowing for easier access
to canal openings.

7. Remember the Isthmus.

Maxillary MB roots are not perfectly round in cross-section. Different
anatomic configurations are present at different levels of the same root,
especially in the apical 4 mm.


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