Effects of different etching strategies on the microtensile repair bond strength of beautifil II giomer material

Abstract

BackgroundConsidering the differences in the filler particles between giomer and conventional composite resins and the importance of these fillers in the repair bond strength, the aim was to evaluate the effects of different etching strategies with phosphoric acid (PA) and hydrofluoric acid (HF) on the microtensile repair bond strength (µTRBS) of giomer.Material and MethodsTen giomer blocks were randomly assigned into 10: 1) control; 2) 37%PA-20s; 3) 3%HF-20s; 4) 3%HF-120s; 5) 9.6%HF-20s; 6) 9.6%HF-120s; 7) 37%PA-20s + 3%HF-120s; 8) 37%PA-20s + 9.6%HF-120s; 9) 3%HF-120s + 37%PA-20s; 10) 9.6%HF-120s + 37%PA-20s. In all groups, the One-Step Plus bonding system was applied and the new giomer block was bonded to the existing giomer. After cross-sectional cutting, 18 samples were prepared from each block and the µTRBS of the samples was measured at a strain rate of 0.5 mm/min. Data were analyzed with one-way ANOVA and post hoc Tukey tests (P<0.05).ResultsThe µTRBS in groups 4, 5, 6, 7, 8 and 10 were significantly higher than that in the control group (P<0.05). The µTRBS in group 2 was even less than that in the control group (P<0.001). The highest µTRBS was recorded in group 10, which was significantly different from those in groups 3, 4 and 9 (P<0.05). In addition, the differences between group 9 and groups 6, 7 and 8 were significantly different (P<0.05).ConclusionsEtching with PA resulted in a decrease in µTRBS. Etching with HF, except for 3%HF-20s and HF after etching with PA, resulted in a significant increase in giomer`s µTRBS. An increase in the application time of 3%HF resulted in a significant increase in the µTRBS. Key words:Dental restoration repair, Hydrofluoric acid, Phosphoric acid, etching.

Chemical Surface Modification Methods of Resin Composite Repaired with Resin-Modified Glass-Ionomer Cement

“…Loomans et al 16 found that surface roughness in resin composites was unaffected by phosphoric acid. Moreover, Bahari et al 17 reported that rough and regular surfaces were significantly smoothed after etching with 37% phosphoric acid, surface roughness has decreased, as a result, the bond strength was significantly reduced.…”

Avaliação das diferentes unidades de fotoativação na microdureza das resinas injetáveis

“…Essas partículas, por meio da tecnologia Giomer, conferem ao material a propriedade de ser bioativo. Além disso, mostra-se superior em propriedades mecânicas pela incorporação de uma maior quantidade de carga inorgânica (Shofu Flowable F00 -67,3%), igualando a uma resina convencional (Filltek Supreme XT Universal -72,5%) 5,6 .…”

Effect of surface treatments on the bond repair strength of resin composite to different artificial teeth

“…The success of these procedures mainly depends on the composite resin adhesion to the artificial teeth [7]. Various methods have been reported to improve the reactivity of highly converted composites; these methods include acid etching [9], air abrasion [10] and the use of adhesives [11]. There is no consensus on the results obtained with the different procedures.…”