This study investigated the effects of fumaric acid on push‐out bond strength when applied to dentin surfaces and fiber posts. The root canals of 60 mandibular premolar teeth were instrumented and obturated. After removing two thirds of filling material, teeth were prepared according to six randomized groups (n = 10/group) defined by two fiber post surface treatments (0.7% fumaric acid or 9% hydrofluoric acid) and three dentin conditioning treatments [control (no conditioning); 17% ethylenediamine tetraacetic acid (EDTA); or 0.7% fumaric acid]. After fiber post‐cementation, three 1‐mm thick discs were obtained from each tooth by transverse sectioning, and each disc underwent push‐out bond strength testing. Data were analyzed with a one‐way analyses of variance (anova) and t tests; p < .05 was considered statistically significant. Failure modes were determined by stereomicroscopy, and the surface characteristics of dentin and fiber posts were observed by scanning electron microscopy. Push‐out bond strength was greater for the group in which the post surface treated with hydrofluoric acid and the dentin surface treated with fumaric acid than the nontreated dentin and hydrofluoric acid‐treated post group (p < .05). There were no significant differences between other comparison pairs (p > .05). A combination of fumaric acid dentin conditioning and hydrofluoric acid fiber post treatment strengthened the bonding ability of fiber posts.

中文翻译：

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用富马酸进行牙本质和纤维桩表面处理对纤维桩粘合能力的影响。

本研究调查了富马酸在应用于牙本质表面和纤维桩时对推出粘合强度的影响。对 60 颗下颌前磨牙的根管进行了器械填充和封闭。除去填充材料的三分之二后，根据六项随机组制备齿（Ñ = 10 /组）由两个纤维后的表面处理（0.7％富马酸或9％的氢氟酸）和三个牙本质调理处理[控制（定义无调理）；17% 乙二胺四乙酸 (EDTA)；或 0.7% 富马酸]。纤维后固结后，通过横向切片从每个牙齿上获得三个 1 mm 厚的圆盘，每个圆盘都进行了推出粘结强度测试。使用单向方差分析 ( anova ) 和t检验；p  < .05 被认为具有统计学意义。通过立体显微镜确定失效模式，并通过扫描电子显微镜观察牙本质和纤维桩的表面特征。与未处理的牙本质和氢氟酸处理的后组相比，用氢氟酸处理的后表面和用富马酸处理的牙本质表面组的推出粘合强度更大（p  < .05）。其他比较对之间没有显着差异（p  > .05）。富马酸牙本质调理和氢氟酸纤维后处理相结合，增强了纤维桩的粘合能力。