Effect of interfacial surface treatment on bond strength of particulate-filled composite to short fiber-reinforced composite

• Published in: Biomaterial investigations in dentistry 2022, Vol.9 (1), p.33-40
• Main Authors: Lassila, L, Tuokko, J, Suni, A, Garoushi, S, Vallittu, P K
• Format: Article
• Language: English
• Subjects: Brief Report; flowable composite; shear bond strength; Short Communication; Short-fiber reinforced composite; surface treatment
• ISSN: 2641-5275; 2641-5275
• DOI: 10.1080/26415275.2022.2070489

The aim was to investigate the effect of different interfacial surface treatments on the shear bond strength (SBS) between a short fiber-reinforced flowable composite (SFRC) and a particulate-filled flowable composite (PFC). In addition, SBS between two successive layers of similar materials was evaluated. One-hundred and forty-four specimens were prepared having either SFRC (everX Flow) as a substructure composite and PFC (G-aenial Flo X) as a surface composite or having one of the two materials as both substructure and surface layer. Eight groups of specimens were created (  = 18/per group) according to the interfacial surface protocol used. Group 1: no treatment; Group 2: ethanol one wipe; Group 3: ethanol three wipes; Group 4: phosphoric acid etching + bonding agent; Group 5: hydrofluoric acid etching + bonding agent; and Group 6: grinding + phosphoric acid etching. Group 7: only PFC layers and Group 8 (control) only SFRC layers without any surface treatment. After one-day storage (37 °C), SBS between surface and substructure composite layers was measured in a universal testing machine, and failure modes were visually analyzed. SEM was used to examine the bonding surface of the SFRC composite after surface treatment. SBS values were statistically analyzed with a one-way analysis of variance (ANOVA) followed by the Tukey HSD test (α = .05). The SBS between successive SFRC layers (Group 8) was statistically (