Department of Restorative Dentistry, Faculty of Dentistry, University of Debrecen, Hungary.
Department of Orthodontics, Faculty of Dentistry, University of Debrecen, Hungary.
J Dent. 2019 Jun;85:57-63. doi: 10.1016/j.jdent.2019.04.012. Epub 2019 May 1.
To evaluate the effects of different surface conditioning methods on the immediate repair bond strength and integrity of the repaired composite interface.
One hundred and five resin composite blocks made of a nanohybrid resin composite were randomly assigned to one of the following surface conditioning groups (n = 15/group): Group 1: Gluma Self Etch™ adhesive system, Group 2: Tokuyama Bond Force II™ adhesive system, Group 3: non-roughened and non-conditioned surfaces, Group 4: sandblasting and Gluma Self Etch™, Group 5: sandblasting and Tokuyama Bond Force II™, Group 6: sandblasting only. A positive control group was also used. Resin composite identical to the substrate was applied and the repaired specimens were subjected to shear bond strength (SBS) testing. Representative samples from all groups were subjected to scanning electron microscopy and surface profilometry to determine their mode of failure. The data were analysed statistically using Analysis of Variance (ANOVA) and two independent sample t-test (α = 0.05).
The mean SBS of all test groups ranged between 1.92 and 5.40 MPa and varied with the degree of composite surface roughness and the type of adhesive system employed. Significantly highest SBS values (5.40 ± 0.36 MPa) were obtained in Group 5 (p = 0.017) which were comparable to the coherent strength of the resin composite in the positive control group (p > 0.05).
Under the tested conditions, significantly greater SBS of repaired resin composite was achieved when the substrate surface was conditioned by sandblasting followed by the application of the Tokuyama Bond Force II™ adhesive system.
Effecting a repair of a nanohybrid composite restoration with sandblasting and the application of TBF II would seem to enhance the interfacial bond strength and integrity of the repaired resin composite interface. Clinical trials are necessary to determine the usefulness of this technique.
评估不同表面处理方法对修复复合界面即时修复粘结强度和完整性的影响。
将 105 块由纳米复合树脂制成的树脂复合块随机分为以下表面处理组之一（n=15/组）：组 1：Gluma Self EtchTM 粘结系统，组 2：Tokuyama Bond Force IITM 粘结系统，组 3：未粗糙化和未处理表面，组 4：喷砂和 Gluma Self EtchTM，组 5：喷砂和 Tokuyama Bond Force IITM，组 6：仅喷砂。还使用了阳性对照组。应用与基底相同的树脂复合材料，并对修复试件进行剪切粘结强度（SBS）测试。从所有组中抽取代表性样品进行扫描电子显微镜和表面轮廓测量，以确定其失效模式。使用方差分析（ANOVA）和两个独立样本 t 检验（α=0.05）对数据进行统计分析。
所有测试组的平均 SBS 值在 1.92 至 5.40 MPa 之间变化，与复合表面粗糙度程度和使用的粘结系统类型有关。在组 5 中获得了显著最高的 SBS 值（5.40±0.36 MPa）（p=0.017），与阳性对照组中树脂复合材料的内聚强度相当（p>0.05）。
在测试条件下，当基底表面经过喷砂处理后再应用 Tokuyama Bond Force IITM 粘结系统处理时，修复后的树脂复合材料的 SBS 值显著增加。
对纳米复合修复体进行喷砂和 TBF II 处理的修复似乎可以增强修复后的树脂复合界面的界面粘结强度和完整性。需要进行临床试验来确定该技术的实用性。
