Sant'Anna-Júnior Arnaldo, Tanomaru-Filho Mário, Hungaro Duarte Marco Antonio, Santos Nunes Reis José Mauricio, Guerreiro-Tanomaru Juliane Maria
Department of Restorative Dentistry, Araraquara Dental School, São Paulo State University, UNESP, Araraquara, SP.
J Endod. 2009 Jun;35(6):879-82. doi: 10.1016/j.joen.2009.03.009. Epub 2009 Apr 19.
The aim of this study was to assess temperature changes in conventional gutta-percha, thermoplastic gutta-percha, and Resilon cones by using thermomechanical compaction technique.
The root canals of extracted human teeth were placed in resin blocks and sectioned. After root canal preparation, cavities perforating the lingual wall were prepared at 4 and 8 mm from the apex, and K-type thermocouples coupled to a digital temperature meter were inserted until reaching the root canal. After placement of the main cone and accessory cones of each material assessed, a #45 thermomechanical compactor was used at 10,000 rpm. Data were analyzed by using analysis of variance and Tukey test for paired comparisons (P < .05).
A significant difference was observed between initial and maximum temperatures (mean increase, 5 degrees C-8 degrees C) with all materials (P < .05). The 3 materials showed similar temperature changes (P > .05). Changes in the apical third were higher when compared with the cervical third (P < .05).
Our results suggest that gutta-percha and Resilon present similar temperature changes during thermomechanical compaction.
本研究的目的是通过热机械压实技术评估传统牙胶尖、热塑性牙胶尖和Resilon牙胶尖的温度变化。
将拔除的人牙根管置于树脂块中并进行切片。根管预备后，在距根尖4毫米和8毫米处制备穿透舌侧壁的洞，将与数字温度计相连的K型热电偶插入直至到达根管。在放置每种评估材料的主尖和副尖后，使用#45热机械压实器以10,000转/分钟的速度进行操作。采用方差分析和Tukey检验进行配对比较分析数据（P <.05）。
所有材料在初始温度和最高温度之间均观察到显著差异（平均升高5摄氏度至8摄氏度）（P <.05）。这三种材料显示出相似的温度变化（P >.05）。与根管颈段相比，根尖段的温度变化更高（P <.05）。
我们的结果表明，在热机械压实过程中，牙胶尖和Resilon呈现相似的温度变化。
