Influence of the Restorative Strategy on Push-out Bond Strength of the Self-adhesive Composite
Uêdja N Oliveira, Isabelle L de Oliveira, Oscar FF de Brito, Marleny EM de Martínez Gerbi, Márcia A Durão, Gabriela QM Monteiro
Bond strength, Push-out force, Self-adhesive composite
Citation Information :
Oliveira UN, de Oliveira IL, de Brito OF, de Martínez Gerbi ME, Durão MA, Monteiro GQ. Influence of the Restorative Strategy on Push-out Bond Strength of the Self-adhesive Composite. J Contemp Dent Pract 2019; 20 (12):1384-1388.
Aim: This study evaluated the influence of the resin composite and bonding strategy on the push-out bond strength of the self-adhesive, Fusio liquid dentin (FUS) (Pentron Clinical), and of two conventional resin composites of different viscosities, Filtek Z250 (3M ESPE) and tetric flow (Ivoclar Vivadent).
Materials and methods: Thirty-two bovine incisors were used after disinfection. The roots were sectioned and the buccal and lingual surfaces were polished until a 2-mm slab was achieved, maintaining enamel at the buccal surface and dentin at the lingual surface. Standardized cavities were then prepared (2.0 × 1.5 mm) and restored according to the following bonding strategies: Fusio liquid dentin with selective etching (FUSSE) in enamel, FUS, Filtek Z250, and tetric flow-total etching (TET). All groups were restored in bulk. After 24 hours of storage in distilled water, finishing and polishing were performed. The push-out test was conducted on a universal testing machine (0.05 mm/minute). Data were analyzed through Kruskal–Wallis and Mann–Whitney tests (p = 0.05). The extruded restorations were evaluated under a stereomicroscope (10×) for failure-mode evaluation.
Results: There were no statistically significant differences between the groups TET, Z250, and FUS, with 145.59, 108.91, and 104.12 MPa means, respectively. The FUSSE group (40.92 MPa) showed a statistically significant lower bond strength. The predominant failure mode was a mixed failure for all groups.
Conclusion: The self-adhesive resin composite achieved a satisfactory result on bond strength when compared to conventional composites with regular and low viscosities, except when selective enamel etching was done.
Clinical significance: This study shows that the clinicians must be aware of the viscosity of the phosphoric acid to avoid dentin contamination whenever performing selective enamel etching. And the self-adhesive resin composite studied presented as another restorative alternative.
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