de Almeida Leopoldina de Fátima Dantas, Souza Samilly Evangelista, Sampaio Aline Araújo, Cavalcanti Yuri Wanderley, da Silva Wander José, Del Bel Cur Altair A, Hebling Josimeri
Department of Restorative Dentistry, Araraquara Dental School, University Estadual Paulista-UNESP, Araraquara Sao Paulo, Brazil.
Department of Prosthodontics and Periodontology Piracicaba Dental School, University of Campinas, Piracicaba Sao Paulo, Brazil.
J Contemp Dent Pract. 2015 Jul 1;16(7):531-6. doi: 10.5005/jp-journals-10024-1717.
The surface free energy of conditioned-dentin is one of the factors that interfere with monomeric infiltration of the interfibrillar spaces. Saturation of the tooth matrix with different substances may modulate this energy and, consequently, the wettability of the dentin.
To evaluate the influence of different substances used to saturate conditioned-dentin on surface free energy (SFE) of this substrate.
Dentin blocks (4 × 7 × 1 mm, n = 6/ group), obtained from the roots of bovine incisors, were etched using phosphoric acid for 15 seconds, rinsed and gently dried. The surfaces were treated for 60 seconds with: ultra-purified water (H20-control); ethanol (EtOH), acetone (ACT), chlorhexidine (CHX), ethylenediaminetetraacetic acid (EDTA); or sodium hypochlorite (NaOCl). The tooth surfaces were once again dried with absorbent paper and prepared for SFE evaluation using three standards: water, formamide and bromonaphthalene. Analysis of variance (ANOVA) and Dunnet's tests (a = 0.05) were applied to the data.
Ethylenediaminetetraacetic acid was the only substance that caused a change to the contact angle for the standards water and formamide, while only EtOH influenced the angles formed between formamide and the dentin surface. None of the substances exerted a significant effect for bromonaphtha-lene. In comparison to the control, only EDTA and NaOCl altered both polar components of the SFE. Total SFE was increased by saturation of the collagen matrix by EDTA and reduced when NaOCl was used.
Saturation of the collagen matrix by EDTA and EtOH changed the surface free energy of the dentin. In addition, the use of NaOCl negatively interfered with the properties evaluated.
The increase of surface free energy and wettability of the dentin surface would allow higher penetration of the the adhesive system, which would be of importance to the clinical success of resin-dentin union.
预处理牙本质的表面自由能是干扰单体渗入纤维间间隙的因素之一。用不同物质使牙基质饱和可调节这种能量，从而影响牙本质的润湿性。
评估用于使预处理牙本质饱和的不同物质对该底物表面自由能（SFE）的影响。
从牛切牙根获取牙本质块（4×7×1mm，每组n = 6），用磷酸蚀刻15秒，冲洗并轻轻干燥。表面用以下物质处理60秒：超纯水（H2O - 对照组）；乙醇（EtOH）、丙酮（ACT）、氯己定（CHX）、乙二胺四乙酸（EDTA）；或次氯酸钠（NaOCl）。牙表面再次用吸水纸干燥，并使用三种标准物质：水、甲酰胺和溴萘，准备进行SFE评估。对数据应用方差分析（ANOVA）和邓尼特检验（α = 0.05）。
乙二胺四乙酸是唯一使标准物质水和甲酰胺的接触角发生变化的物质，而只有乙醇影响甲酰胺与牙本质表面形成的角度。没有一种物质对溴萘产生显著影响。与对照组相比，只有EDTA和NaOCl改变了SFE的两个极性成分。EDTA使胶原基质饱和会增加总SFE，而使用NaOCl时总SFE会降低。
EDTA和EtOH使胶原基质饱和改变了牙本质的表面自由能。此外，使用NaOCl对所评估的性能产生了负面影响。
牙本质表面自由能和润湿性的增加将使粘结系统有更高的渗透率，这对树脂 - 牙本质结合的临床成功具有重要意义。
