Cumbo Enzo, Russo Riccardo, Gallina Giuseppe
Department of Surgical Oncology, University of Palermo, Section of Oral Science, Palermo, Italy.
J Conserv Dent. 2012 Oct;15(4):342-5. doi: 10.4103/0972-0707.101897.
The aim of this study is to verify the variations of the temperature inside the root canal with three different gutta-percha heating systems.
A split-tooth model was built with a lateral groove at 3.5-mm from working length (WL) in order to insert a Chromel-Alumel K-type thermocouple placed in contact with gutta-percha. The thermocouple was connected to a digital thermometer. Sixty obturations were made with medium gutta-percha points. For 20 specimens the System B was used with the Buchanan fine plugger and the temperature was set at 200°C; for other 20 specimens the Endo-Twinn with a fine plugger was used and for the last 20 specimens we used the E-Fill with a 40.04 plugger. All pluggers were pushed to 3.5 mm from WL so that the tips were in contact to the probe.
The analysis of 60 samples showed the highest temperature average using the System B after 10 seconds (86.85°C), after 15 seconds (94.9°C), after 20 seconds (100.4°C) and after 25 seconds (104.5°C). The Endo-Twinn average values are similar to System-B ones. The E-Fill average values are lower (69.9°C) than the other two systems evaluated only after 10 seconds due to limited working time. The temperatures average obtained using different systems of warm vertical compaction are lower than what was declared by the producing companies.
Time is one the most important parameters to consider using these systems. Temperatures reached from the System B and Endo-Twinn after 25 seconds; however, seem to be sufficient to ensure an optimal adaptation of the gutta-percha in the anatomical complexity of root canals. The temperatures obtained from the E-Fill, only after 10 seconds, instead seems to be insufficient to assure the rheological characteristics of gutta-percha.
本研究的目的是验证三种不同牙胶加热系统根管内的温度变化。
构建一个离体牙模型，在距工作长度（WL）3.5毫米处有一个侧方凹槽，以便插入与牙胶接触的铬镍铝K型热电偶。热电偶连接到数字温度计。使用中号牙胶尖进行60次根管充填。20个样本使用配有布坎南精细充填器的System B，温度设置为200°C；另外20个样本使用配有精细充填器的Endo-Twinn；最后20个样本使用配有40.04充填器的E-Fill。所有充填器均从WL推至3.5毫米，使尖端与探头接触。
对60个样本的分析显示，使用System B时，10秒后（86.85°C）、15秒后（94.9°C）、20秒后（100.4°C）和25秒后（104.5°C）的平均温度最高。Endo-Twinn的平均值与System B的相似。由于工作时间有限，E-Fill的平均值仅在10秒后低于其他两个评估系统（69.9°C）。使用不同热垂直加压系统获得的平均温度低于生产公司宣称的温度。
时间是使用这些系统时要考虑的最重要参数之一。System B和Endo-Twinn在25秒后达到的温度似乎足以确保牙胶在根管解剖复杂性中实现最佳适应性。而E-Fill仅在10秒后获得的温度似乎不足以保证牙胶的流变学特性。
