An in vitro computerized temperature measurement system was developed to measure intracanal temperatures produced by different heated gutta-percha obturation techniques. The temperatures produced by low- and high-temperature thermoplasticized injectable gutta-percha systems were recorded and compared in this investigation. The mean intrachamber temperature of the Obtura syringe was 178.68 degrees C. The mean temperature of the Ultrafil heater was 93.06 degrees C. The mean temperature of the extruded gutta-percha was 137.81 degrees C from the Obtura syringe and 62.88 degrees C from the Ultrafil cannule. The intracanal temperature of the gutta-percha recorded for both systems showed that the gutta-percha cools rapidly after injection into the canal.