Hamze Faeze, Ganjalikhan Nasab Seyed Abdolreza, Eskandarizadeh Ali, Shahravan Arash, Akhavan Fard Fatemeh, Sinaee Neda
Oral and Dental Disease Research Center, Kerman University of Medical Science, Kerman, Iran.
Mechanical Engineering Department, Engineering School, Shahid Bahonar University, Kerman, Iran.
Iran Endod J. 2018 Spring;13(2):195-199. doi: 10.22037/iej.v13i2.18756.
Due to thermal hazard during composite restorations, this study was designed to scan the pulp temperature by thermocouple and infrared camera during photo polymerizing different composites.
A mesio-occlso-distal (MOD) cavity was prepared in an extracted tooth and the K-type thermocouple was fixed in its pulp chamber. Subsequently, 1 mm increment of each composites were inserted (four composite types were incorporated) and photo polymerized employing either LED or QTH systems for 60 sec while the temperature was recorded with 10 sec intervals. Ultimately, the same tooth was hemisected bucco-lingually and the amalgam was removed. The same composite curing procedure was repeated while the thermogram was recorded using an infrared camera. Thereafter, the data was analyzed by repeated measured ANOVA followed by Tukey's HSD Post Hoc test for multiple comparisons (=0.05).
The pulp temperature was significantly increased (repeated measures) during photo polymerization (=0.000) while there was no significant difference among the results recorded by thermocouple comparing to infrared camera (>0.05). Moreover, different composite materials and LCUs lead to similar outcomes (>0.05).
Although various composites have significant different chemical compositions, they lead to similar pulp thermal changes. Moreover, both the infrared camera and the thermocouple would record parallel results of dental pulp temperature.
由于复合树脂修复过程中的热危害，本研究旨在在光固化不同复合树脂时，通过热电偶和红外热像仪扫描牙髓温度。
在一颗拔除的牙齿上制备近中-牙合-远中（MOD）洞型，并将K型热电偶固定在牙髓腔中。随后，每次以1mm的增量填入每种复合树脂（共纳入四种复合树脂类型），并使用发光二极管（LED）或石英卤素灯（QTH）系统光固化60秒，同时每隔10秒记录一次温度。最后，将同一颗牙齿沿颊舌方向对半切开，去除汞合金。重复相同的复合树脂固化程序，同时使用红外热像仪记录热成像图。此后，通过重复测量方差分析对数据进行分析，随后使用Tukey's HSD事后检验进行多重比较（α = 0.05）。
在光固化过程中，牙髓温度显著升高（重复测量）（P = 0.000），而与红外热像仪记录的结果相比，热电偶记录的结果之间无显著差异（P > 0.05）。此外，不同的复合材料和光固化单元导致相似的结果（P > 0.05）。
尽管各种复合树脂的化学成分有显著差异，但它们导致相似的牙髓热变化。此外，红外热像仪和热电偶都能记录平行的牙髓温度结果。
