Loguercio Alessandro D, Muñoz Miguel Angel, Luque-Martinez Issis, Hass Viviane, Reis Alessandra, Perdigão Jorge
Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, Ponta Grossa, Paraná, Brazil.
School of Dentistry, Universidad de Valparaíso, Valparaíso, Chile.
J Dent. 2015 Sep;43(9):1060-1070. doi: 10.1016/j.jdent.2015.04.005. Epub 2015 Apr 20.
To evaluate the effect of adhesion strategy on the enamel microshear bond strengths (μSBS), etching pattern, and in situ degree of conversion (DC) of seven universal adhesives.
84 extracted third molars were sectioned in four parts (buccal, lingual, proximal) and divided into 21 groups, according to the combination of the main factors adhesive (AdheSE Universal [ADU], All-Bond Universal [ABU], Clearfil Universal [CFU], Futurabond U [FBU], G-Bond Plus [GBP], Prime&Bond Elect (PBE), and Scotchbond Universal Adhesive [SBU]), and adhesion strategy (etch-and-rinse, active self-etch, and passive self-etch). Specimens were stored in water (37°C/24h) and tested at 1.0mm/min (μSBS). Enamel-resin interfaces were evaluated for DC using micro-Raman spectroscopy. The enamel-etching pattern was evaluated under a field-emission scanning electron microscope (direct and replica techniques). Data were analyzed with two-way ANOVA and Tukey's test (α=0.05).
Active self-etch application increased μSBS and DC for five out of the seven universal adhesives when compared to passive application (p<0.001). A deeper enamel-etching pattern was observed for all universal adhesives in the etch-and-rinse strategy. A slight improvement in etching ability was observed in active self-etch application compared to that of passive self-etch application. Replicas of GBP and PBE applied in active self-etch mode displayed morphological features compatible with water droplets. The DC of GBP and PBE were not affected by the application/strategy mode.
In light of the improved performance of universal adhesives when applied actively in SE mode, selective enamel etching with phosphoric acid may not be crucial for their adhesion to enamel.
The active application of universal adhesives in self-etch mode may be a practical alternative to enamel etching in specific clinical situations.
评估粘结策略对七种通用粘结剂的釉质微拉伸粘结强度（μSBS）、酸蚀模式及原位转化率（DC）的影响。
将84颗拔除的第三磨牙切成四部分（颊侧、舌侧、邻面），根据主要因素粘结剂（AdheSE通用型[ADU]、全粘结通用型[ABU]、Clearfil通用型[CFU]、Futurabond U[FBU]、G-Bond Plus[GBP]、Prime&Bond Elect[PBE]和Scotchbond通用粘结剂[SBU]）和粘结策略（酸蚀冲洗、主动自酸蚀和被动自酸蚀）的组合分为21组。标本在水中（37°C/24小时）保存，并以1.0mm/分钟的速度进行测试（μSBS）。使用显微拉曼光谱评估釉质-树脂界面的DC。在场发射扫描电子显微镜下评估釉质酸蚀模式（直接和复型技术）。数据采用双向方差分析和Tukey检验（α=0.05）进行分析。
与被动应用相比，主动自酸蚀应用使七种通用粘结剂中的五种的μSBS和DC增加（p<0.001）。在酸蚀冲洗策略中，所有通用粘结剂的釉质酸蚀模式更深。与被动自酸蚀应用相比，主动自酸蚀应用的酸蚀能力略有提高。以主动自酸蚀模式应用的GBP和PBE的复型显示出与水滴相容的形态特征。GBP和PBE的DC不受应用/策略模式的影响。
鉴于通用粘结剂在自酸蚀模式下主动应用时性能有所改善，用磷酸进行选择性釉质酸蚀对其与釉质的粘结可能并非至关重要。
在特定临床情况下，通用粘结剂在自酸蚀模式下的主动应用可能是釉质酸蚀的一种实用替代方法。
