Here..briefly explanation to Chloroform-Dip technique in ENDODONTIC : ) NOTE : all this from my reading in some scientific website and articles

1. By :
Ghadeer hassan 

2.  Chloroform Dip Technique Is One Of The Methods To
Increase Adaptation Of Gutta-percha Master Cone At The End
Of Root Canal
 The dipping technique is based on gutta-percha’s property of
becoming soft when dipped in chloroform.
 When softened and forced into the root canal, a guttapercha
point may be given the exact three-dimensional form of the root
canal space

3. The terminal 3 mm of gutta-percha master cone
is placed in chloroform for 1 second and then
compressed in to the canal
Then after 25 seconds it is emitted, covered
with sealer and replaced into the root canal.
Finally, the root canal is obturated using
lateral condensation technique
Quality of seal of apical irregularities
Dipping
Apical impression

4. The Dipping Technique Has Been Advocated By Some For Use Without A
Sealer
due to the fact that the surface of a gutta-percha point has a
certain stickiness in the softened condition. However, as stressed
above, gutta-percha alone cannot seal the root canal. When the
solvent has evaporated, the point loses its stickiness and gaps will
develop between the point and the root canal wall. Thus, the use of
a sealer is mandatory with all gutta-percha techniques
fortunately !
Misconception

5. To ensure better adaptation of the gutta percha cone,
chloroform is used in dip technique.
1- The cone is dipped in a small amount of chloroform and then fit into
the canal.
2-The cone is inserted and removed a few times in order to take an
"impression" of the apical portion of the canal.
3- It is important to remove the excess chloroform by rinsing the cone in
alcohol and drying it with an air syringe for a full 30 seconds.
4- Excessive chloroform present in the gutta percha cone can result in
shrinkage of the filling material and loss of gutta percha integrity . And
may ba occure irritation to periapical tissue . Finally these problems can
affect apical seal