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Introduction: The main objective of pulp therapy in pediatric dentistry is to preserve the integrity of the primary dentition until its natural exfoliation. Applying instruments and techniques that support the dense filling of the whole root canal system is necessary for successful obturation. Various obturating materials are available for pulpectomy, of which Metapex is the most commonly used material. Objective: To analyze and standardize (Metapex) material amount in primary teeth obturation. Methodology: Twelve excised primary canines had access cavities made in them. These were sealed with GIC and sliced at the apices to leave 6 mm of working length. Enlarging the channels, irrigation was carried out using 1% sodium hypochlorite and regular saline. Following a cone beam computed tomography scan of the specimens, the preobturation volume (X) of each tooth was assessed. Next, the teeth were split into two groups at random: Group 1 (Metapex group quantity: 2 ml) and Group 2 (Metapex group quantity: 3 ml). After obturation, a second CBCT was taken to measure the postobturation volume (Y). The percentage of obturated volume was calculated by the following formula: (Postobturation volume/preobturation volume) ×100 ([Y/X] ×100). Results: Intergroup comparison of mean canal volume showed a statistically significant difference between both groups. Conclusion: After analyzing and standardizing the material amount in primary teeth, an efficient obturation outcome in the pulpectomy procedure was observed. [ABSTRACT FROM AUTHOR]