Curved & dilacerated Canals typesand management

1. Curved & dilacerated
Canals
Dr.Lena Ali

2. What is it? Curved? dilacerated?
Causes are??
%?
Where?
How to detect it?
How to determine the degree of
curvature?

4.  Ultimate challenge during instrumentation ,why?
• Ledge
• Perforation
• Strip perforation
• Transportaion
• Blokage of the canal
• Fracturing instruments
Clinical significance

12. o Gradual curvature of the mesial canals in the
apical third.
o Acute curvature in the apical third.
o Curvature throughout the canal.
o Dilacerated root canal .
o S-shaped root canal.
Types according to it’s morphology

17.  Decreasing the restoring force by means
of which straight file apt to bend against
the curved dentine surface
 Decreasing the length of the file which is
aggressively cutting at a given span.
Techniques used for management

18. 1. Precurving the file
A precurved file traverses the curve better than a straight
file. Precurving is done in two ways:
• Placing a gradual curve for the entire length of the file
• Placing a sharp curve of nearly 45° near the apical end
of the instrument
 Decreasing the restoring force is done
by:

20. 2. Extravagant use of smaller number files as
they can follow canal curvature
3. Use of intermediate size of files
4. Use of flexible files
 Decreasing the restoring force is done
by:

21. 1. Anti-curvature filing.
 Decrease in length of actively cutting
files is achieved by the following :

22. 2. Modifying cutting edges of the instrument by
dulling the flute on outer surface of apical third
and inner portion of middle third, which can
be done by arkansas bur.

23. 3. Change Instrumentation technique
 Crown-down technique benefits
• Reduced coronal binding of instruments.
• Less likelihood for a change in the working
length measurement during preparation.
• Less risk of inoculation of endodontic pathogens
into the periradicular tissues.
• Enhanced penetration of irrigant into the root
canal system .
• Less risk of extrusion of irrigant and debris.

24.  Balanced forced technique
• Efficient and less prone to cause iatrogenic
damage and maintains the instruments centrally
within the root canal.
• Extrusion of debris apically is also reduced,
resulting in less postoperative pain.

25. 1. Apical
2. Middle
3. Coronal
4. Combination
Types according to it’s location

26. Apical

28. Coronal

32. Middle