Fan Fan, Ibrahim Muhammad, Dai Panpan, Mao Yixin, He Bing, Wu Gang, Ma Jianfeng, Huang Shengbin
Institute of Stomatology, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, China.
Department of Prosthodontics, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, China.
Eur J Oral Sci. 2017 Oct;125(5):396-402. doi: 10.1111/eos.12365. Epub 2017 Aug 7.
The aim of this study was to evaluate the effect of maleic acid (MA) on both the bond strength of fibre post to root dentine and smear layer removal after post space preparation. Sixty, single-canal premolars were endodontically treated and randomly assigned to four groups: group 1 [0.9% saline solution (control]); group 2 [2.5% sodium hypochlorite (NaOCl)]; group 3 [17% ethylenediaminetetraacetic acid (EDTA) followed by 2.5% NaOCl]; and group 4 (7% MA followed by 2.5% NaOCl). Self-adhesive resin cement was used to test the adhesion of a glass-fibre post to the root dentine through a micropush-out test. Scanning electron microscopy was performed to examine and score the treated specimens for smear layer removal, and stereomicroscopy was applied to investigate the failure modes of fibre posts. Maleic acid exhibited the highest mean bond-strength values in the apical regions among all the groups. Most failure modes (31.9%) were adhesive-type failures between the dentine and luting materials. Maleic acid performed statistically significantly better than the other groups regarding smear layer removal, especially in the apical region. Maleic acid is an effective irrigant that can remove the smear layer, open dentinal tubules, and act as a high-efficiency final irrigant in activation protocols.
本研究的目的是评估马来酸（MA）对纤维桩与牙根牙本质之间的粘结强度以及桩道预备后玷污层去除情况的影响。选取60颗单根管前磨牙进行根管治疗，并随机分为四组：第1组[0.9%生理盐水溶液（对照组）]；第2组[2.5%次氯酸钠（NaOCl）]；第3组[17%乙二胺四乙酸（EDTA），随后用2.5% NaOCl]；第4组（7% MA，随后用2.5% NaOCl）。使用自粘结树脂水门汀通过微推出试验测试玻璃纤维桩与牙根牙本质的粘结力。通过扫描电子显微镜对处理后的标本进行检查并对玷污层去除情况进行评分，应用体视显微镜研究纤维桩的失败模式。在所有组中，马来酸在根尖区域表现出最高的平均粘结强度值。大多数失败模式（31.9%）为牙本质与粘结材料之间的粘结型失败。在玷污层去除方面，马来酸的表现明显优于其他组，尤其是在根尖区域。马来酸是一种有效的冲洗剂，可去除玷污层、开放牙本质小管，并在活化方案中作为高效的终末冲洗剂。
