Bijelic-Donova Jasmina, Garoushi Sufyan, Lassila Lippo V J, Vallittu Pekka K
Department of Biomaterials Science and Turku Clinical Biomaterials Centre-TCBC, Institute of Dentistry, University of Turku, Turku, Finland.
Eur J Oral Sci. 2015 Feb;123(1):53-60. doi: 10.1111/eos.12167. Epub 2014 Dec 31.
An oxygen inhibition layer develops on surfaces exposed to air during polymerization of particulate filling composite. This study assessed the thickness of the oxygen inhibition layer of short-fiber-reinforced composite in comparison with conventional particulate filling composites. The effect of an oxygen inhibition layer on the shear bond strength of incrementally placed particulate filling composite layers was also evaluated. Four different restorative composites were selected: everX Posterior (a short-fiber-reinforced composite), Z250, SupremeXT, and Silorane. All composites were evaluated regarding the thickness of the oxygen inhibition layer and for shear bond strength. An equal amount of each composite was polymerized in air between two glass plates and the thickness of the oxygen inhibition layer was measured using a stereomicroscope. Cylindrical-shaped specimens were prepared for measurement of shear bond strength by placing incrementally two layers of the same composite material. Before applying the second composite layer, the first increment's bonding site was treated as follows: grinding with 1,000-grit silicon-carbide (SiC) abrasive paper, or treatment with ethanol or with water-spray. The inhibition depth was lowest (11.6 μm) for water-sprayed Silorane and greatest (22.9 μm) for the water-sprayed short-fiber-reinforced composite. The shear bond strength ranged from 5.8 MPa (ground Silorane) to 36.4 MPa (water-sprayed SupremeXT). The presence of an oxygen inhibition layer enhanced the interlayer shear bond strength of all investigated materials, but its absence resulted in cohesive and mixed failures only with the short-fiber-reinforced composite. Thus, more durable adhesion with short-fiber-reinforced composite is expected.
在颗粒填充复合材料聚合过程中，暴露于空气中的表面会形成氧抑制层。本研究评估了短纤维增强复合材料的氧抑制层厚度，并与传统颗粒填充复合材料进行比较。还评估了氧抑制层对逐层放置的颗粒填充复合材料层剪切粘结强度的影响。选择了四种不同的修复复合材料：everX Posterior（一种短纤维增强复合材料）、Z250、SupremeXT和Silorane。对所有复合材料的氧抑制层厚度和剪切粘结强度进行了评估。将等量的每种复合材料在两块玻璃板之间于空气中聚合，并用体视显微镜测量氧抑制层的厚度。制备圆柱形试样，通过逐层放置两层相同的复合材料来测量剪切粘结强度。在施加第二层复合材料之前，对第一层增量的粘结部位进行如下处理：用1000目碳化硅（SiC）砂纸打磨，或用乙醇或喷水处理。喷水处理的Silorane的抑制深度最低（11.6μm），喷水处理的短纤维增强复合材料的抑制深度最大（22.9μm）。剪切粘结强度范围为5.8MPa（打磨的Silorane）至36.4MPa（喷水处理的SupremeXT）。氧抑制层的存在增强了所有研究材料的层间剪切粘结强度，但没有氧抑制层时，仅短纤维增强复合材料出现内聚破坏和混合破坏。因此，预计短纤维增强复合材料具有更持久的粘结力。
