热牙胶充填系统携热头工作状态下的实际温度
Real temperature of the continuous-wave pluggers

目的：测量热牙胶充填系统携热头工作状态下的实际温度，为临床研究热损伤、观察温度升高对充填材料影响提供理论依据。方法：使用双通道K型电偶温度计测量3种热牙胶充填系统的不同大小携热头和携热头不同部位（工作端尖端和距尖端2 mm、5 mm、10 mm处）的实际温度（设置温度200 ℃），重复测量5次，比较不同充填系统、不同携热头大小、不同测量位点的实际工作温度和设置温度的差异，并用单因素方差分析法分析各因素的影响。结果：BeeFill 40/0.03携热头尖端工作温度最高（198.7±7.7）℃，与设定温度200 ℃差异无统计学意义（P＞0.05），其余携热头工作温度均低于设定温度200 ℃，差异有统计学意义（P<0.05），BeeFill 60/0.06携热头距尖端10 mm处温度最低（69.9±4.0） ℃。所有携热头尖端（0 mm）及尖端2 mm处温度较高（112.1~198.7 ℃，中位数140.8 ℃）。结论：大部分热牙胶充填系统的携热头实际工作温度低于设定温度200 ℃。
Objective： To measure the real temperatures on the pluggers of three continuous-wave devices, and to provide theoretical reference to evaluate thermal damage and heat’s influence on the filling materials. Methods: The dual channel K type thermocouple was contacted to various sizes’ pluggers in three different continuous-wave devices (BeeFill, Elements, B&L), and the highest temperatures at different points (tip, and 2 mm, 5 mm, 10 mm from the tip) of the pluggers (preset temperature was 200 ℃) were recorded. The measurements were performed 5 times. T-test was used to compare the real temperatures at the tips with that set on the display and one-way ANOVA was used to compare the temperatures of the pluggers in different devices, sizes and points. Results: The highest temperature was at the tip of BeeFill 40/0.03 plugger (198.7±7.7) ℃, but there was on statistical differences between that and the preset temperature 200 ℃. The temperatures of the remaining pluggers were obviously lower than 200 ℃（P<0.05）. The lowest temperature of the pluggers was detected at 10 mm from the tip of BeeFill 60/0.06 plugger (69.9±4.0） ℃. The highest temperature of each plugger was detected at the tip or 2 mm from the tip （112.1 to 198.7 ℃，and the median was 140.8 ℃）. Conclusion: The real temperature of most continuous-wave pluggers included in this study is below the set temperature 200 ℃.