Bakhsh Turki A, Alfaifi Abdulaziz, Alghamdi Yousef, Nassar Mohannad, Abuljadyel Roaa A
Restorative Dentistry Department, Faculty of Dentistry, King Abdulaziz University, P.O. Box 80209, Jeddah 215-89, Saudi Arabia.
Cariology and Operative Dentistry, Tokyo Medical and Dental University, Tokyo 113-8549, Japan.
Polymers (Basel). 2023 Oct 17;15(20):4117. doi: 10.3390/polym15204117.
The goal of this study was to compare the pulp temperature increase during light curing of different composite thicknesses in deep class I cavities using two thermal sensing tools.
Round occlusal class I cavities with a remaining dentin thickness (RDT) of 1 mm from the cavity floor were performed on 15 extracted sound molars. Samples were divided into three groups ( = 5). In group A, cavities were restored using the Filtek Z350 XT conventional composite through the incremental filling technique, whereas group B cavities were restored using the Filtek Bulk-Fill flowable composite through the bulk-fill technique. Specimens of the Filtek Bulk-Fill flowable composite using the incremental filling technique were used to restore cavities in group C. An infrared thermal camera (IRT; Flir, Wilsonville, OR, USA) and K-type thermocouple (Perfect Prime TC0520, New York, NY, USA) were used to measure the heat generated during composite photo-polymerization.
There were no significant differences within the same group using either the thermocouple or IRT ( > 0.05). One-way ANOVA showed no significant differences between groups A and C ( > 0.05), whereas group B was significantly different from groups A and C with each sensing tool ( < 0.05).
IRT and thermocouple heat readings were comparable. Based on the current findings, the bulk-fill technique resulted in the lowest heat generation among the groups. Therefore, increasing the light-curing time and the number of composite increments was directly correlated with increases in intra-pulpal temperature.
本研究的目的是使用两种热传感工具比较在深I类洞不同复合树脂厚度光固化过程中牙髓温度的升高情况。
在15颗拔除的健康磨牙上制备距洞底剩余牙本质厚度（RDT）为1mm的圆形咬合面I类洞。样本分为三组（每组n = 5）。A组采用Filtek Z350 XT传统复合树脂通过分层充填技术修复窝洞，而B组窝洞采用Filtek Bulk-Fill流动复合树脂通过一次性充填技术修复。C组使用采用分层充填技术的Filtek Bulk-Fill流动复合树脂样本修复窝洞。使用红外热像仪（IRT；美国俄勒冈州威尔逊维尔市菲力尔公司）和K型热电偶（美国纽约市Perfect Prime TC0520）测量复合树脂光聚合过程中产生的热量。
在同一组内，使用热电偶或IRT测量均无显著差异（P>0.05）。单因素方差分析显示A组和C组之间无显著差异（P>0.05），而使用每种传感工具时，B组与A组和C组均有显著差异（P<0.05）。
IRT和热电偶的热读数具有可比性。根据目前的研究结果，一次性充填技术在各组中产生的热量最低。因此，增加光固化时间和复合树脂分层次数与牙髓腔内温度升高直接相关。
