Lopes Ana Lílian Correia, Ribeiro Mara Eliane Soares, Barbosa Jorge Henrique Pinheiro, da Costa da Rocha Max Pinto, da Silva E Souza Júnior Mário Honorato, Loretto Sandro Cordeiro
Biomaterials Laboratory of the Postgraduate Program in Dentistry, Institute of Health Sciences, Federal University of Pará (UFPA), Belém 66075-110, PA, Brazil.
Materials (Basel). 2023 Sep 21;16(18):6328. doi: 10.3390/ma16186328.
The objective of this study was to evaluate different delaying times after bleaching and the use of different sodium ascorbate (SA) concentrations (10% and 35%) in the bond strength of adhesive cementation to enamel. This study used 54 sound bovine incisors, which were randomly assigned to the following groups: G1 (unbleached/control+ adhesive cementation (AC)); G2 (bleached + AC after 7 days); G3 (bleached + 10% SA + AC after 24 h); G4 (bleached + 10% SA + AC after 7 days); G5 (bleached + 35% SA + AC after 24 h); and G6 (bleached + 35% SA + AC after 7 days). After bleaching, G3, G4, G5, and G6 received an application of SA before the cylinders build up with RelyX Veneer cement. The samples were subjected to microshear test, and the results were analyzed by two-way ANOVA with Tukey's post hoc test. Group one presented the highest mean bond strength (19.1 MPa) and G3 the lowest (16.96 MPa). There was no statistical difference between the groups tested ( ˃ 0.05). The fracture pattern observed was predominantly mixed. The adhesive cementation may be performed 24 h after bleaching when SA (10% or 35%) is used or after 7 days, without compromising bond strength.
本研究的目的是评估漂白后的不同延迟时间以及不同浓度的抗坏血酸钠（SA）（10%和35%）对粘结剂与牙釉质粘结强度的影响。本研究使用了54颗完好的牛切牙，随机分为以下几组：G1（未漂白/对照组+粘结剂粘结（AC））；G2（漂白后7天+AC）；G3（漂白后24小时+10% SA+AC）；G4（漂白后7天+10% SA+AC）；G5（漂白后24小时+35% SA+AC）；G6（漂白后7天+35% SA+AC）。漂白后，G3、G4、G5和G6在使用RelyX Veneer粘结剂堆积圆柱体之前应用SA。对样本进行微剪切测试，并通过双向方差分析和Tukey事后检验分析结果。第一组的平均粘结强度最高（19.1 MPa），G3最低（16.96 MPa）。测试组之间没有统计学差异（˃ 0.05）。观察到的断裂模式主要是混合性的。当使用SA（10%或35%）时，粘结剂粘结可在漂白后24小时或7天后进行，而不会影响粘结强度。
