Valdivia Andréa Dolores Correia Miranda, Novais Veridiana Resende, Menezes Murilo de Sousa, Roscoe Marina Guimarães, Estrela Carlos, Soares Carlos José
Department of Operative Dentistry and Dental Materials, School of Dentistry, UFU - Federal University of Uberlândia, Uberlândia, MG, Brazil.
Department of Endodontics, School of Dentistry, UFG - Federal University of Goiás, Goiânia, GO, Brazil.
Braz Dent J. 2014;25(4):314-20. doi: 10.1590/0103-6440201300143.
This study evaluated the influence of the surface treatments of fiberglass posts on bond strength to root dentin using push-out test. Forty bovine incisor roots were endodontically treated. The surface of the fiberglass posts (Exacto #2, Angelus) were treated using 4 different protocols (n=10): Control - 70% ethanol for 1 min; 37% phosphoric acid for 1 min; 10% hydrofluoric acid for 1 min; and 24% hydrogen peroxide for 1 min. After a silane coupling agent was applied for 1 min and all posts were cemented using self-adhesive resin cement (RelyX Unicem, 3M-ESPE). The roots were sectioned and two 1-mm-thick slices were obtained from each third: cervical, middle and apical. The specimens were subjected to the push-out test with a crosshead speed of 0.5 mm/min. Data were analyzed by repeated measures ANOVA followed by Tukey's HSD tests (=0.05). The surface treatment (p<0.001) and root third region (p=0.007) factors were significant. The retention to root canal was affected by surface treatment type. The post surface treatment with 24% hydrogen peroxide for 1 min yielded significantly higher bond strength when the fiberglass posts were cemented with RelyX Unicem.
本研究采用推出试验评估了玻璃纤维桩表面处理对其与根管牙本质粘结强度的影响。选取40颗牛切牙牙根进行根管治疗。对玻璃纤维桩（Exacto #2，安吉利斯公司）表面采用4种不同方案进行处理（n = 10）：对照组——70%乙醇处理1分钟；37%磷酸处理1分钟；10%氢氟酸处理1分钟；24%过氧化氢处理1分钟。在应用硅烷偶联剂1分钟后，所有桩均使用自粘结树脂水门汀（RelyX Unicem，3M-ESPE公司）粘结。将牙根进行切片，从每个牙根的颈段、中段和根尖段各获取两片1毫米厚的切片。对标本以0.5毫米/分钟的十字头速度进行推出试验。数据采用重复测量方差分析，随后进行Tukey's HSD检验（α = 0.05）。表面处理因素（p < 0.001）和牙根段区域因素（p = 0.007）具有显著性。根管内的固位受表面处理类型的影响。当使用RelyX Unicem粘结玻璃纤维桩时，用24%过氧化氢处理桩表面1分钟可产生显著更高的粘结强度。
