Effect of interfacial surface treatment on bond strength of particulate-filled composite to short fiber-reinforced composite. Issue 1 (31st December 2022)

• Record Type: Journal Article
• Authors: Lassila, L.; Tuokko, J.; Suni, A.; Garoushi, S.; Vallittu, P. K.
• Is Part Of: Biomaterial investigations in dentistry. Volume 9:Issue 1(2022)
• Page Start: 33
• Page End: 40
• Publication Date: 2022-12-31
• Subjects: Short-fiber reinforced composite -- surface treatment -- flowable composite -- shear bond strength; Dental materials -- Periodicals; Dentistry -- Periodicals; Biomedical and Dental Materials; Periodical; 617.695
• DOI: 10.1080/26415275.2022.2070489
• Languages: English
• ISSNs: 2641-5275

Abstract

Abstract: Objective: 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. Materials and methods: 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 ( n = 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). Results: The SBS between successive SFRC layers (Group 8) was statistically ( p < .05) the highest (43.7 MPa) among tested groups. Surface roughening by grinding followed by phosphoric acid etching (Group 6) resulted in a higher SBS (28.8 MPa) than the remaining surface treatments. Conclusion: Flowable composite with glass fibers (everX Flow) showed higher interlayer SBS compared to PFC flowable composite. Interfacial surface roughness increases the bonding of PFC to the substructure of SFRC.