Department of Dental Materials, Faculty of Dentistry, Tehran University of Medical Sciences; Research Center for Medical and Technology in Medical Sciences, Tehran University of Medical Sciences, Tehran, Iran.
J Adv Prosthodont. 2011 Dec;3(4):216-20. doi: 10.4047/jap.2011.3.4.216. Epub 2011 Dec 28.
Heat of composite polymerization (HP) indicates setting efficacy and temperature increase of composite in clinical procedures. The purpose of this in vitro experimental study was to evaluate the effects of 5 temperatures on HP of two new composites.
From each material (Core Max II [CM] and King Dental [KD]), 5 groups of 5 specimens each were prepared and their total HPs (J/gr) were measured and recorded, at one of the constant temperatures 0℃, 15℃, 23℃, 37℃ and 60℃ (2 × 5 × 5 specimens) using a differential scanning calorimetry (DSC) analyzer. The data were analyzed using a two-way ANOVA, a Tukey's test, an independent-samples t-test, and a linear regression analysis (α=0.05).
No polymerization reactions occurred at 0℃; then this temperature was excluded from statistical analyses. The mean HP of the remaining 20 KD specimens was 20.5 ± 14.9 J/gr, while it was 40.7 ± 12.9 J/gr for CM. The independent-samples t-test showed that there were significant differences between the HP of the two materials at the temperatures 15℃ (P=.0001), 23℃ (P=.0163), 37℃ (P=.0039), and 60℃ (P=.0106). Linear regression analysis showed statistically significant correlations between environment temperatures and HP of CM (R(2)=0.777).
Using CM is advantageous over conventional composite because of its better polymerization capacity. However due to its high HP, further studies should assess its temperature increase in vivo. Preheating KD is recommended. Refrigerating composites can negatively affect their polymerization potential.
复合材料聚合热（HP）表示临床操作中复合材料的固化效果和温度升高。本体外实验研究的目的是评估 5 种温度对两种新型复合材料 HP 的影响。
从每种材料（Core Max II [CM] 和 King Dental [KD]）中制备 5 组每组 5 个样本，使用差示扫描量热法（DSC）分析仪在 0℃、15℃、23℃、37℃和 60℃（2×5×5 个样本）这 5 个恒定温度下测量和记录它们的总 HP（J/gr）。使用双向方差分析、Tukey 检验、独立样本 t 检验和线性回归分析（α=0.05）对数据进行分析。
在 0℃时没有聚合反应；因此，该温度被排除在统计分析之外。剩余 20 个 KD 样本的平均 HP 为 20.5±14.9 J/gr，而 CM 的平均 HP 为 40.7±12.9 J/gr。独立样本 t 检验显示，两种材料在 15℃（P=.0001）、23℃（P=.0163）、37℃（P=.0039）和 60℃（P=.0106）的 HP 之间存在显著差异。线性回归分析显示，CM 的环境温度与 HP 之间存在统计学显著相关性（R²=0.777）。
与传统复合材料相比，使用 CM 具有更好的聚合能力，因此具有优势。然而，由于其高 HP，应进一步研究其在体内的温度升高。建议对 KD 进行预热。冷却复合材料可能会对其聚合能力产生负面影响。
