Cantoro Amerigo, Goracci Cecilia, Papacchini Federica, Mazzitelli Claudia, Fadda Giovanni Maria, Ferrari Marco
Department of Dental Materials, University of Siena, Siena, Italy.
Dent Mater. 2008 May;24(5):577-83. doi: 10.1016/j.dental.2007.06.012. Epub 2007 Jul 30.
To assess whether the pre-cure temperature of resin cements significantly influenced the bonding potential to dentin.
Forty extracted molars were randomly divided into 8 groups (n=5): Groups (1-4) RelyX Unicem (RU, 3 M ESPE) and Groups (5-8) Panavia F 2.0 (PF, Kuraray Co.), at pre-cure temperatures of 4, 24, 37, and 60 degrees C, respectively. Cements were used in dual-cure mode for luting composite overlays (Paradigm MZ100, 3 M ESPE) to dentin. Microtensile bond strength testing and scanning electron microscope (SEM) observations of cement-dentin interfaces were performed.
Group 4 had to be eliminated as RU at 60 degrees C underwent such an accelerated curing that was already set at the time of dispensing. The bond strengths (MPa) measured at refrigerator, room, and intraoral temperature were, respectively: RU 5.4+/-1.7, 11.4+/-6.1, 10.6+/-4.2; PF 7.4+/-3.7, 13.9+/-6.2, 12+/-5.2. The statistical analysis revealed that both luting agents developed a significantly weaker adhesion when used at refrigerator temperature (p<0.05). No statistically significant differences in bond strength were recorded when either cement was used at 24 or 37 degrees C (p>0.05). Pre-heating of PF to 60 degrees C resulted in a significant increase in bond strength (20.7+/-9.4 MPa; p<0.05). SEM observations disclosed an enhanced potential of PF to form a hybrid layer as the temperature increased over 4 degrees C. RU exhibited a less porous and more homogeneous layer at intraoral than at refrigerated temperature.
It is advisable to let refrigerator-stored resin cements warm up to at least room temperature prior to clinical use. Pre-heating to 60 degrees C enhances the bonding potential of PF.
评估树脂水门汀的预固化温度是否会显著影响其与牙本质的粘结潜能。
40颗拔除的磨牙随机分为8组（每组n = 5）：（1 - 4）组使用RelyX Unicem（RU，3M ESPE公司），（5 - 8）组使用Panavia F 2.0（PF，可乐丽公司），预固化温度分别为4℃、24℃、37℃和60℃。水门汀采用双重固化模式用于将复合树脂贴面（Paradigm MZ100，3M ESPE公司）粘结到牙本质上。进行微拉伸粘结强度测试以及对水门汀 - 牙本质界面进行扫描电子显微镜（SEM）观察。
第4组必须排除，因为60℃的RU固化加速过快，在调配时就已固化。在冷藏温度、室温及口腔温度下测得的粘结强度（MPa）分别为：RU 5.4±1.7、11.4±6.1、10.6±4.2；PF 7.4±3.7、13.9±6.2、12±5.2。统计分析表明，两种粘结剂在冷藏温度下使用时粘结力均显著减弱（p < 0.05）。当两种水门汀在24℃或37℃使用时，粘结强度无统计学显著差异（p > 0.05）。将PF预热至60℃会使粘结强度显著增加（20.7±9.4 MPa；p < 0.05）。SEM观察显示，随着温度超过4℃升高，PF形成混合层的潜能增强。与冷藏温度相比，RU在口腔温度下呈现出孔隙较少且更均匀的层。
临床使用前，建议将冷藏保存的树脂水门汀加热至至少室温。预热至60℃可增强PF的粘结潜能。
