In Vitro Investigation of the Effect of Silanizing on the Microshear Repaired Bond Strength of Short-Fiber Composites after Surface Treatment with an Er;Cr:YSGG Laser, Sandblasting, or Bur : Effectiveness of silanizing on the repaired bond strength of Short-fiber composite.

BACKGROUND: This study aimed to evaluate the effect of various interfacial surface treatments on the repair micro shear bond strength (μSBS) of aged short fiber-reinforced composite (SFRC).

MATERIALS AND METHODS: The substrate and repair composite material used in the fabrication of eighty samples were SFRC (Ever-X posterior, GC). Based on the mechanical roughening method, the samples were divided into four categories: diamond bur, sandblasting, laser treatment, and a control group. Then, they were split into two groups using the chemical conditioning method: those using a universal bonding that contains silane and those using a separate silane step before the universal adhesive that contains silane. After 40 days of immersion in distilled water at 37°C, the specimens were removed. Universal testing machine was used to implement SBS testing. Using field emission scanning electron microscopy (FESEM), the surface topography of the composite material was examined after the roughening procedures.

RESULTS: Althoughthe study revealed that there was no statistically significant variance in μSBS between groups (P 0.05), but compared between the groups in which silane used, laser has made a significant difference (P 0.05 ). Similarly, no notable distinction was identified in μSBS when utilizing universal adhesive with or without an additional silanizing step (P 0.05).

CONCLUSION: According the data, surface preparation method dosen't affect the repaired μSBS of SFRC composite. If using silane before universal adhesive, laser preparation is effective on increasing bond strength. Also, adding a separate silanization step before using the silane-containing universal adhesive did not enhance the μSBS and isn't necessary.