A group. This was to be expected, because

A correlation
was found between root canal morphology and the master cone adjustment
variables in the “Single-cone” group. When the morphology was oval, we observed
better gutta-percha adjustment. This could be explained by the smaller amount
of friction between the master-cone and the root canal walls in an oval canal
compared with a circular canal. This correlation was not found in the “Combined
system” group. This was to be expected, because if the gutta-percha is heated
and condensed, the root canal morphology no longer matters (Robberecht, et al,
2012).

To cope with
such different obturation difficulties many root obturating techniques have
been evaluated over the years and the filling materials from simple paste
mixtures to silver points with sealing cements. To obturate root canal system the
ideal obturating material chosen should be non-irritating, non-toxic,
radiopaque, easily manipulated, insoluble in tissue fluids and able to adapt to
canal walls. Gutta-percha
is currently the material of choice due to its inertness, biocompatibility,
dimensional stability and plasticity (Qureshi, et al, 2012).

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Three-dimensional
obturation of the prepared root canals is essential to long- term clinical
success of root canal therapy. The root canal system should be sealed apically,
coronally, and laterally and the obturation material should be of uniform
density. Epley et al and Schilder suggested that the ideal root canal obturating
material should be well-adapted to the canal walls and its irregularities and
the entire length of the canal be densely compacted with homogenous mass of
gutta-percha. Several materials and techniques have been developed for
achieving a successful obturation, gutta-percha is the most commonly used root
canal obturation material and its physical properties have made it possible to
use it in several different techniques (Mustafa, 2013).

Lateral
consideration of gutta-percha has been proven to be a very popular and
clinically effective filling technique. However, Schilder reported that final
filling by lateral consideration resulted in a non-homogeneous mass of many
separate gutta-percha cones pressed together and joined only by friction and
the cementing substance. Warm gutta-percha best fulfills the requirements of a
root canal filling because homogeneity is provided throughout the entire length
of filling (Samson, et al,
2013).

To achieve
long-term stability, the filling should be well adapted to the canal walls, and
its irregularities and the entire length of the canal should be densely
compacted with a homogeneous mass of gutta-percha (Wolf, et al, 2014).

The maximum
amount of obturating material was observed in Calamus group followed by
Thermafil and lateral compaction. Minimum voids were seen in obturation by
Calamus technique (Gupta, et al, 2015).

In a study
that concluded the carrier-based gutta-percha obturation systems revealed significantly
higher percentage of gutta-percha-filled area in comparison to single-cone and
lateral condensation techniques (Yilmaz, et al, 2016).

In all the
pervious study showing that different obturation method can get different
result which will affect in the quality of the root canal filling. Using
guttaflow and carrier-based gutta-percha obturation systems show the least
amount of voids and also the highest in filled area in comparing to the others
technique.