Behnia A, McDonald N J
Department of Endodontics, Baltimore College of Dental Surgery, Dental School, The University of Maryland-Baltimore, 21201-1586, USA.
J Endod. 2001 Mar;27(3):203-5. doi: 10.1097/00004770-200103000-00016.
The purpose of this in vitro study was to investigate root surface temperatures generated by the Thermafil Plus system using infrared thermography. A total of 60 extracted human maxillary central incisors and maxillary first molars were biomechanically instrumented using ProFile 0.04 Taper Series 29 rotary instruments. The root canals were obturated using the Thermafil Plus system. An infrared thermography camera was used to measure the external root surface temperatures during and after the completion of obturation. The mean temperature rise of the external root surface from the ambient temperature was 4.26 degrees C for the mesial buccal roots, 4.58 degrees C for the distobuccal roots, 4.76 degrees C for the palatal roots, and 4.87 degrees C for the anterior roots. These temperatures were well below the critical level of 10 degrees C needed to cause damage to the attachment apparatus. From this in vitro experiment, no evidence was discovered which would indicate that the Thermafil Plus obturation system would result in damage to the periodontal ligament and the surrounding attachment apparatus as a consequence of temperature rise on the external root surface.
本体外研究的目的是使用红外热成像技术研究Thermafil Plus系统产生的牙根表面温度。总共60颗拔除的人类上颌中切牙和上颌第一磨牙使用ProFile 0.04锥度29号旋转器械进行生物力学预备。根管使用Thermafil Plus系统进行充填。在充填过程中和充填完成后，使用红外热成像相机测量牙根表面外部温度。近中颊根牙根表面外部温度相对于环境温度的平均升高为4.26℃，远中颊根为4.58℃，腭根为4.76℃，前根为4.87℃。这些温度远低于导致附着装置损伤所需的10℃临界水平。从该体外实验中，未发现有证据表明Thermafil Plus充填系统会因牙根表面外部温度升高而导致牙周膜和周围附着装置受损。
