Purpose: to measure the temperature change within the root canal and on the root surface at different radicular levels while using with the System B Heat Source. Fine (F), Fine-Medium (FM), and Medium (M) pluggers at temperature settings of 200°C, 250°C and 300°C in comparison to Obtura II and ultrasonic delivery of warm gutta-percha . 300°C were N= 3 maxillary central incisors
Materials and Methods:
•Tooth split model prepared. Computer used to record thermocouple temperatures was used
•Thermocouple was placed in 0,2,4,6 mm from WL
•Teeth were prepared using crown-down, step-back technique. Apical size tooth #1=35, #2=40, #3=50
•System B:F, FM, and M pluggers at temperature settings of 200°C, 250°C, and 300°C were evaluated. System B was inserted 4-5 mm from WL.
•Obtura II: used by setting the unit temperature to 185°C and placing 23-gauge needle at 4 to 5 mm from WL .
•Ultrasonic lateral compaction: cone #35 inserted, SP3 tip use to 2 mm from the WL, FF accesory inserted, SP-3 tip was then used in a step-back method at 3 mm, 4 mm, 5 mm, and 6 mm from WL
•Sealer was used in all 3 groups
Most highlighted Results:
•Mean temperature changes and SD are shown in Table 1
•System B, the Obtura II, or ultrasonic delivery of warm gutta-percha never exceed an increase of 10°C at any thermocouple level on the external root surface.