Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, MN, USA.
Department of Diagnostic and Biological Sciences, School of Dentistry, University of Minnesota, Minneapolis, MN, USA.
J Dent. 2016 Sep;52:37-44. doi: 10.1016/j.jdent.2016.07.002. Epub 2016 Jul 6.
This study presents a variant of the Brazilian disk test (BDT) for assessing the bond strength between composite resins and dentin.
Dentin-composite disks (ϕ 5mm×2mm) were prepared using either Z100 or Z250 (3M ESPE) in combination with one of three adhesives, Adper Easy Bond (EB), Adper Scotchbond Multi-Purpose (MP) and Adper Single Bond (SB), and tested under diametral compression. Acoustic emission (AE) and digital image correlation (DIC) were used to monitor debonding of the composite from the dentin ring. A finite element (FE) model was created to calculate the bond strengths using the failure loads. Fracture modes were examined by scanning electron microscopy (SEM).
Most specimens fractured along the dentin-resin composite interface. DIC and AE confirmed interfacial debonding immediately before fracture of the dentin ring. Results showed that the mean bond strength with EB (14.9±1.9MPa) was significantly higher than with MP (13.2±2.4MPa) or SB (12.9±3.0MPa) (p<0.05); no significant difference was found between MP and SB (p>0.05). Z100 (14.5±2.3MPa) showed higher bond strength than Z250 (12.7±2.5MPa) (p<0.05). Majority of specimens (91.3%) showed an adhesive failure mode. EB failed mostly at the dentin-adhesive interface, whereas MP at the composite-adhesive interface; specimens with SB failed at the composite-adhesive interface and cohesively in the adhesive.
The BDT variant showed to be a suitable alternative for measuring the bond strength between dentin and composite, with zero premature failure, reduced variability in the measurements, and consistent failure at the dentin-composite interface.
The new test could help to predict the clinical performance of adhesive systems more effectively and consistently by reducing the coefficient of variation in the measured bond strength.
本研究提出了一种巴西盘测试（BDT）的变体，用于评估复合树脂与牙本质之间的粘结强度。
使用 Z100 或 Z250（3M ESPE）与三种胶粘剂中的一种（Adper Easy Bond [EB]、Adper Scotchbond Multi-Purpose [MP]和 Adper Single Bond [SB]）组合制备ϕ 5mm×2mm 的牙本质-复合树脂盘，并在直径压缩下进行测试。声发射（AE）和数字图像相关（DIC）用于监测复合树脂从牙本质环的脱粘。创建有限元（FE）模型以使用失效载荷计算粘结强度。通过扫描电子显微镜（SEM）检查断裂模式。
大多数试样沿牙本质-树脂复合材料界面断裂。DIC 和 AE 在牙本质环断裂前立即确认界面脱粘。结果表明，与 MP（13.2±2.4MPa）或 SB（12.9±3.0MPa）相比，EB（14.9±1.9MPa）的平均粘结强度明显更高（p<0.05）；MP 和 SB 之间无显著差异（p>0.05）。Z100（14.5±2.3MPa）的粘结强度高于 Z250（12.7±2.5MPa）（p<0.05）。大多数试样（91.3%）表现为粘接力失效模式。EB 主要在牙本质-胶粘剂界面失效，而 MP 在复合-胶粘剂界面失效；用 SB 处理的试样在复合-胶粘剂界面失效，并在胶粘剂中内聚失效。
BDT 变体被证明是一种替代方法，用于测量牙本质和复合树脂之间的粘结强度，具有零过早失效、测量值的变异性降低以及在牙本质-复合材料界面处的一致失效。
通过降低测量粘结强度的变异系数，新测试可以帮助更有效地和一致地预测胶粘剂系统的临床性能。
