Sweatman T L, Baumgartner J C, Sakaguchi R L
School of Dentistry, Oregon Health Sciences University, Portland 97201, USA.
J Endod. 2001 Aug;27(8):512-5. doi: 10.1097/00004770-200108000-00004.
Thermoplasticized gutta-percha has been used to obturate root canals. The continuous wave of condensation technique uses the System B Heat Source with the choice of different-sized pluggers. The purpose of this study was to measure the temperatures within the root canal and on the root surface at different radicular levels while using the System B Heat Source. Fine, Fine-Medium, and Medium pluggers were evaluated at temperature settings of 200 degrees C, 250 degrees C, and 300 degrees C. The Obtura II gutta-percha delivery system following the manufacturer's instructions and ultrasonically thermoplasticized gutta-percha were used for comparative purposes. The highest mean temperature change on the internal root surface was 74.19 degrees C with the system B at the 6 mm level (6 mm coronal to working length) when the Fine-Medium plugger was set at 300 degrees C. The lowest mean temperature change on the internal root surface was 2.09 degrees C at the 0 mm level (at working length) when the F plugger was set at 200 degrees C. With the Obtura II, the lowest mean internal temperature change was 5.22 degrees C at the 0 mm level, whereas the highest mean internal temperature change was 26.63 degrees C at the 6 mm level. With ultrasonic lateral compaction the lowest mean internal temperature change was 5.01 degrees C at the 0 mm level, whereas the highest mean internal temperature change was 28.95 degrees C at the 6 mm level. At no time did the System B, the Obtura II, or ultrasonic delivery of warm gutta-percha exceed an increase of 10 degrees C at any thermocouple level on the external root surface.
热塑牙胶已被用于根管充填。连续波加压技术使用System B加热源，并可选择不同尺寸的充填器。本研究的目的是在使用System B加热源时，测量根管内和不同牙根水平牙根表面的温度。在200℃、250℃和300℃的温度设置下，对细、中细和中号充填器进行了评估。为作比较，使用了遵循制造商说明的Obtura II牙胶输送系统和超声热塑牙胶。当将中细号充填器设置为300℃时，在牙根表面内部，System B在6mm水平（距工作长度冠方6mm）处的最高平均温度变化为74.19℃。当将细号充填器设置为200℃时，在牙根表面内部，0mm水平（工作长度处）的最低平均温度变化为2.09℃。使用Obtura II时，在0mm水平处的最低平均内部温度变化为5.22℃，而在6mm水平处的最高平均内部温度变化为26.63℃。采用超声侧方加压时，在0mm水平处的最低平均内部温度变化为5.01℃，而在6mm水平处的最高平均内部温度变化为28.95℃。在牙根表面外部的任何热电偶水平上，System B、Obtura II或热塑牙胶的超声输送在任何时候都未超过10℃的升温幅度。
