In many
studies the percentage of gutta-percha filled area (PGP) has been measured. The
better quality of obturation have smaller area of sealer and voids and the PGP
is higher. When the PGP score is lower reveal a problem in filling or anal
occupied by debris. The PGP score lower in oval canal due to difficult to place
secondary cones in the wing and irregular shape of the wing reveal a problem when
using the cold lateral compaction technique