Department of Conservative Dentistry, School of Dental Medicine, University Hospital Heidelberg, Germany.
Dent Mater. 2012 May;28(5):541-7. doi: 10.1016/j.dental.2011.12.001. Epub 2012 Jan 9.
The aim of the study was to analyze the dissolving depth of adhesive resin monomers into pre-polymerized fiber-reinforced composites (FRC) with either a semi-interpenetrating polymer network (semi-IPN) or a cross-linked polymer (CLP) matrix.
Five unidirectional FRCs were tested, including one semi-IPN FRC (everStick(®) C&B, StickTech, (ES)) and four CLP-FRCs (GrandTec(®), VOCO, (GT); Dentapreg(®), ADM, (DP); TenderFiber(®), Micerium, (TF); Splint-It(®), Pentron Clinical Technologies, (SI)). The FRCs were light-polymerized following manufacturers' instructions: the oxygen inhibition layers were removed and the adhesive resin (Optibond-FL(®), KerrHawe) was labeled with a fluorescent dye (Rhodamine-B-isothiocyanate), which was then applied to the FRCs (5 min) and light-polymerized (40s). Specimens were then prepared for confocal laser scanning microscopy. Three FRC strands per group were sectioned orthogonally to the direction of fibers, thus forming nine slices in each group. Four images were taken from each slice and the depths of adhesive penetration were measured in four sites per image (n=144 measurements per group).
Dissolving depths were 17.28 (3.04) μm (ES), 12.58 (2.94) μm (SI), 7.57 (1.91) μm (TF), 3.27 (0.73) μm (DP) and 2.55 (0.63) μm (GT). Samples were normally distributed. Differences between groups were analyzed by ANOVA (PostHoc Scheffé) showing four subgroups (p=0.05). The infiltration layers detected were either continuous/homogenous (ES, TF, DP GT) or discontinuous/insular (SI).
The adhesive resin monomers were able to diffuse significantly deeper into pre-polymerized semi-IPN specimens than into CLP materials. Semi-IPN specimens showed a homogenous and comparatively deeper layer of infiltration. The diffusion capabilities of secondary-IPN formation might increase the opportunity to establish a good bond between pre-polymerized FRC and new resin.
本研究旨在分析具有半互穿聚合物网络（semi-IPN）或交联聚合物（CLP）基质的预聚合纤维增强复合材料（FRC）中，胶粘剂单体的溶解深度。
测试了 5 种单向 FRC，包括一种半 IPN FRC（everStick ® C&B，StickTech，（ES））和 4 种 CLP-FRC（GrandTec ® ，VOCO，（GT）；Dentapreg ® ，ADM，（DP）；TenderFiber ® ，Micerium，（TF）；Splint-It ® ，Pentron Clinical Technologies，（SI））。按照制造商的说明用光聚合 FRC：去除氧抑制层，将胶粘剂（Optibond-FL ® ，KerrHawe）标记为荧光染料（Rhodamine-B-isothiocyanate），然后将其施加到 FRC 上（5 分钟）并进行光聚合（40 秒）。然后制备共聚焦激光扫描显微镜标本。每组 3 根 FRC 沿纤维方向垂直切割，因此每组形成 9 个切片。从每个切片中取出 4 张图像，并在每张图像的 4 个位置测量胶粘剂渗透深度（每组 144 次测量）。
溶解深度分别为 17.28（3.04）μm（ES）、12.58（2.94）μm（SI）、7.57（1.91）μm（TF）、3.27（0.73）μm（DP）和 2.55（0.63）μm（GT）。样本呈正态分布。通过方差分析（PostHoc Scheffé）分析组间差异，结果显示有 4 个亚组（p=0.05）。检测到的渗透层要么是连续/均匀的（ES、TF、DP、GT），要么是不连续/岛状的（SI）。
胶粘剂单体能够显著渗透到预聚合的半 IPN 标本中，而渗透到 CLP 材料中则较少。半 IPN 标本显示出均匀且相对较深的渗透层。二次 IPN 形成的扩散能力可能会增加预聚合 FRC 与新树脂之间建立良好结合的机会。
