Ulusoy Ö I, Yılmazoğlu M Z, Görgül G
Department of Endodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
Int Endod J. 2015 Feb;48(2):171-6. doi: 10.1111/iej.12297. Epub 2014 May 22.
To evaluate the surface temperature rise using an infrared thermal imaging camera on roots with and without simulated internal resorption cavities, during canal filling with injectable (Obtura II), carrier-based (Soft-Core) gutta-percha and continuous wave of condensation (System B) techniques.
Root canals of 60 mandibular premolar teeth were instrumented to an apical size of 40. Circular artificial internal resorption cavities with a diameter of 2.40 mm were prepared on the root canal walls of 30 teeth. All teeth were divided into six groups of 10 specimen and root filled as follows: group 1 (teeth with internal resorption): thermoplasticized injectable gutta-percha (Obtura II), group 2 (teeth without internal resorption): thermoplasticized injectable gutta-percha (Obtura II), group 3 (teeth with internal resorption): carrier-based gutta-percha (Soft-Core), group 4 (teeth without internal resorption): carrier-based gutta-percha (Soft-Core), group 5 (teeth with internal resorption): continuous wave of condensation (System B) and group 6 (teeth without internal resorption): continuous wave of condensation (System B). The surface temperature changes during filling of canals were measured with an infrared thermal imaging camera. The thermograms were recorded at 2-s intervals over a period of 40 s to determine the maximum temperature rise at the apical, middle and cervical thirds of the root surface. The data were statistically analysed with one-way anova and Tukey HSD post hoc or Kruskal-Wallis and Bonferroni-adjusted Mann-Whitney U-tests if appropriate.
The temperature rise on the surface of roots with artificial resorptive defects was significantly higher compared with the ones without defects in the Obtura II and System B groups (P < 0.001). The System B group with internal resorption was associated with the maximum temperature rise in the apical (4.3 ± 2.1) and middle (19.5 ± 8.9) thirds amongst the groups (P < 0.001).
Use of System B and Obtura II for filling canals with internal resorptive cavities resulted in surface temperature rise over the critical threshold. However, Soft-Core root filling did not increase the temperature over 10 °C.
使用红外热成像相机评估在使用可注射式（Obtura II）、载体型（Soft-Core）牙胶尖以及连续波热凝牙胶充填技术（System B）进行根管充填时，有或无模拟内部吸收腔的牙根表面温度升高情况。
将60颗下颌前磨牙的根管预备至根尖尺寸40。在30颗牙齿的根管壁上制备直径为2.40 mm的圆形人工内部吸收腔。所有牙齿分为6组，每组10个样本，并按以下方式进行根管充填：第1组（有内部吸收的牙齿）：热塑注射型牙胶尖（Obtura II），第2组（无内部吸收的牙齿）：热塑注射型牙胶尖（Obtura II），第3组（有内部吸收的牙齿）：载体型牙胶尖（Soft-Core），第4组（无内部吸收的牙齿）：载体型牙胶尖（Soft-Core），第5组（有内部吸收的牙齿）：连续波热凝技术（System B），第6组（无内部吸收的牙齿）：连续波热凝技术（System B）。使用红外热成像相机测量根管充填过程中的表面温度变化。在40秒内每隔2秒记录一次热成像图，以确定牙根表面根尖、中部和颈部三分之一处的最高温度升高值。如果合适，数据采用单因素方差分析和Tukey HSD事后检验或Kruskal-Wallis检验以及Bonferroni校正的Mann-Whitney U检验进行统计学分析。
在Obtura II组和System B组中，有人工吸收缺陷的牙根表面温度升高明显高于无缺陷的牙根（P < 0.001）。在所有组中，有内部吸收的System B组在根尖三分之一（4.3 ± 2.1）和中部三分之一（19.5 ± 8.9）处温度升高最高（P < 0.001）。
使用System B和Obtura II充填有内部吸收腔的根管会导致表面温度升高超过临界阈值。然而，Soft-Core根管充填并未使温度升高超过10℃。
