Lee S Y, Greener E H, Covey D A, Menis D L
Department of Oral Rehabilitation, School of Dentistry, Taipei Medical College, Taiwan.
J Oral Rehabil. 1996 May;23(5):353-61. doi: 10.1111/j.1365-2842.1996.tb00864.x.
This study evaluated the effect a food simulating solution, 75% v/v ethanol/water, and an artificial saliva, Moi-Stir, have on the microstructure and on the diametral tensile strength (DTS) of three dentine bonding agents (Tenure, Scotchbond Multi-Purpose and Optibond). The microstructure was examined by using a scanning electron microscope (SEM). The DTS data were analysed using ANOVA and the Tukey LSD test. The microstructural observations were compared with changes in DTS. The SEM observation revealed deterioration of all bonding agents due to conditioning in the solutions for 30 days. The different solutions appeared to cause different reactions in the bonding agents. However, these effects may be exaggerated due to the presence of an air-inhibited surface layer. Those conditioned in Moi-Stir showed swelling. The presence of filler particles in the Optibond bonding agent appears to decrease the deterioration resulting from soaking. Materials conditioned in ethanol exhibited both dissolution and thinning. Diametral samples of each bonding material were tested after being conditioned in the above-mentioned solutions for 1, 7, 14 and 30 days. Conditioning significantly decreased the DTS of all bonding agents, except Optibond in Moi-Stir. Filled Optibond maintained its DTS longer than did the two unfilled bonding agents. The decrease in DTS of all the ethanol-conditioned groups is a function of the square root of time (P < 0.001) and conforms to Fick's laws of diffusion. The filled Optibond showed a lower ethanol diffusivity (0.5 x 10(-5) cm2 s-1) than the other two unfilled bonding agent systems (average 1.2 x 10(-5) cm2 s-1) (P < 0.05). The high ethanol diffusivities were thought to be due to the presence of HEMA, a hydrophilic resin, in the bonding agent. These results also suggest that solution uptake occurred through the resin matrix. Filler particles may therefore play an important role in weathering resistance of these materials to oral environment solutions. The physical appearance and strength of dentine bonding agents are significantly altered by exposure to oral environment solutions.
本研究评估了一种食品模拟溶液、75%（v/v）乙醇/水以及一种人工唾液Moi-Stir对三种牙本质粘结剂（Tenure、Scotchbond多功能粘结剂和Optibond）的微观结构和径向拉伸强度（DTS）的影响。通过扫描电子显微镜（SEM）检查微观结构。使用方差分析和Tukey LSD检验分析DTS数据。将微观结构观察结果与DTS的变化进行比较。SEM观察显示，由于在溶液中处理30天，所有粘结剂均出现劣化。不同的溶液似乎在粘结剂中引起不同的反应。然而，由于存在空气抑制表面层，这些影响可能被夸大。在Moi-Stir中处理的粘结剂出现肿胀。Optibond粘结剂中填料颗粒的存在似乎减少了浸泡导致的劣化。在上述溶液中处理1、7、14和30天后，对每种粘结材料的径向样本进行测试。除了在Moi-Stir中的Optibond外，处理显著降低了所有粘结剂的DTS。填充的Optibond比两种未填充的粘结剂保持其DTS的时间更长。所有乙醇处理组的DTS降低是时间平方根的函数（P<0.001），符合菲克扩散定律。填充的Optibond显示出比其他两种未填充的粘结剂体系更低的乙醇扩散率（0.5×10⁻⁵ cm² s⁻¹）（平均1.2×10⁻⁵ cm² s⁻¹）（P<0.05）。高乙醇扩散率被认为是由于粘结剂中存在亲水性树脂甲基丙烯酸羟乙酯（HEMA）。这些结果还表明，溶液通过树脂基质吸收。因此，填料颗粒可能在这些材料对口腔环境溶液的耐候性中起重要作用。暴露于口腔环境溶液会显著改变牙本质粘结剂的物理外观和强度。
