The tooth is asymptomatic. The canal is dry There is no sinus tract. There is no foul odor. A negative culture is obtained.

Criteria for root canal obturation

Root Filling Techniques For Gutta-percha

it has several disadvantages and cannot beconsidered as one that seals canals completely.

the technique is simple,

The master cone should need some force to be seated inside the canal & someforce is required to dislodge the master cone from the canal.

Tug backTug back

The advantage of the lateral compaction technique in comparison with the single-cone technique1. reduces the amount of sealer left in the canal,2. the length control of the filling is quite good3. no filling material is extruded beyond the foramen.4. The seal is good in comparison with other techniques. .

The disadvantage of the lateral compaction methodroot filling consists not of a homogeneous mass of root fillingmaterial but rather of a large number of individual points tightlypressed together and joined by the frictional grip of the cementingsubstance

Solvent-softened gutta-percha

Softened gutta-percha techniques

Warm lateral compaction

A distinct disadvantage is that the softening of the

gutta-percha may lead to overextension of root filling

material.

The advantage of warm lateral compaction is that it

leads to a homogeneous mass that, permitted

significantly less leakage than cold lateral compaction.

Warm vertical compaction

The advantage of the warm vertical compaction technique is that

it results in a homogeneous mass of guttapercha, well-adapted to

the canal wall, that requires a minimum of sealer.

• The disadvantage is that the technique almostconsistently leads to extrusion of filling material

Thermomechanical compaction

Thermomechanical compaction

The advantage is that it is a very fast

technique leading to a compact mass of

gutta-percha that, in wide canals, resulted in

less Leakage than lateral compaction.

The disadvantage is that the technique

requires a lot of practice to get consistent

results.

Injection technique

The Obtura system uses a pressure syringe in which the gutta- percha is warmed to 200°C andexpressed into the canal through a needle as fine as 25 gauge (0.5 mm diameter). The gutta-percha leaves the needle at approximately 70°C.

Advantages of the injection technique are similar to those ofwarm vertical compaction. It also is useful in wide canals withan apical stop and in cases of internal resorption

Advantages of the injection technique are similar to those ofwarm vertical compaction. It also is useful in wide canals withan apical stop and in cases of internal resorption

The disadvantage is the difficultyof controlling the level of the rootfilling, with a possible under- oroverfill as a result. Shrinkage ofthe gutta-percha during coolingmay cause voids

Core carrier technique

Core carrier technique

The advantage of this technique is that, once the

cone is properly heated in the oven with this

system, the canal can be well obturated in all its

dimensions within a short time.

The advantage of this technique is that, once the

cone is properly heated in the oven with this

system, the canal can be well obturated in all its

dimensions within a short time.

The disadvantage of the system is that, especiallyin curved canals, there is a risk for gutta-percha tobe stripped off, thus, the core material will onlybecome cemented apically