Department of BioMedical Engineering, University Medical Center Groningen, University of Groningen, 9713 AV Groningen, The Netherlands.
J Dent. 2010 Jan;38(1):29-38. doi: 10.1016/j.jdent.2009.08.009.
To evaluate immediate repair bond strengths and failure types of resin composites with and without surface conditioning and characterize the interacting composite surfaces by their surface composition and roughness.
Microhybrid, nanohybrid and nanofilled resin composites were photo-polymerized and assigned to four groups: (1) no conditioning (Control), (2) no conditioning, polymerized against a Mylar strip (Control, with strip), (3) intermediate adhesive resin (IAR) application, and (4) chair-side silica coating, silanization and intermediate resin application (SC). Resin composites, similar as their substrates, were adhered onto the substrates. Shear force was applied to the interface in a universal testing machine and failure types were evaluated under light microscopy. Surface characterization was done by contact angle measurements, X-ray photoelectron spectroscopy, scanning electron and atomic force microscopy.
Significant effects of the resin composite type and surface conditioning were observed. Conditioning the composites with their IARs does not result in significant improvements in bond strength compared to the control with strip (bond strengths between 14.5 and 20.0 MPa). SC increased the bond strength in all composites except TE by an average 8.9 MPa, while in all composites the surface roughness increased from 7 to 384 microm. Failure types in this group were exclusively cohesive. Physico-chemical modelling of the composite surfaces showed that the surfaces were dominated by the resin matrix, with a major increase in silica-coverage after SC for all composites.
Intermediate adhesive resin conditioning did not improve the composite-to-composite immediate repair strength. Silica coating and silanization followed by its corresponding IAR, strongly increased repair bond strengths and provided exclusively cohesive failures in the substrate in all composites.
评估经和未经表面处理的树脂复合材料的即刻修复粘结强度和失效类型，并通过其表面成分和粗糙度来描述相互作用的复合表面。
将微混合体、纳米混合体和纳米填充体树脂复合材料进行光聚合，并分为四组：（1）无处理（对照），（2）无处理，与聚酯薄膜聚合（对照，带膜），（3）中间粘结树脂（IAR）应用，和（4）椅旁二氧化硅涂层、硅烷化和中间树脂应用（SC）。将类似其基底的树脂复合材料粘接到基底上。在万能试验机上向界面施加剪切力，并在光学显微镜下评估失效类型。通过接触角测量、X 射线光电子能谱、扫描电子显微镜和原子力显微镜进行表面特性描述。
观察到树脂复合材料类型和表面处理的显著影响。用 IAR 处理复合材料并不会与带膜的对照相比显著提高粘结强度（粘结强度在 14.5 至 20.0 MPa 之间）。SC 除了 TE 之外，在所有复合材料中均提高了粘结强度，平均提高了 8.9 MPa，而在所有复合材料中表面粗糙度从 7 增加到 384 微米。该组的失效类型均为内聚性失效。复合材料表面的物理化学模型表明，表面主要由树脂基质主导，SC 后所有复合材料的硅覆盖率均显著增加。
中间粘结树脂处理并没有提高复合材料的即刻修复粘结强度。二氧化硅涂层和硅烷化，随后用相应的 IAR 处理，强烈提高了修复粘结强度，并在所有复合材料的基底中均提供了内聚性失效。
