The aim of this study was to evaluate the presence of voids in thermollasticized obturation technique using MTA Fill apex as a sealer. 20 human mandibular premolar teeth with single canal were selected. The teeth were divided into 2 groups, 10 teeth in each group. The teeth were cleaned and shaped using Revo–S file system till SU and teeth were obturated: Group 1: Obturation was done using lateral condensation technique using MTA–FILLAPEX and 6% 25tip size GP points. Group 2: Obturation was done using Thermoplasticized obturation technique (Sybron–Endo) using MTA Fillapex as Sealer. In the both obturating technique minimal void observed with group 1 having more voids compared to group 2 but results are statistically insignificant.