Er Cr: YSGG laser, ytterbium fiber laser, and Rose Bengal-activated low-level laser therapy on roughness and shear bond strength of yttria-stabilized zirconia.
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引用次数: 0
Abstract
Aim: Effect of Er Cr: YSGG laser (ECL), ytterbium fiber laser (YFL), Rose Bengal (RB) activated low-level laser therapy (LLLT) on the surface roughness (Ra) and shear bond strength (SBS) of yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP) bonded to resin cement.
Materials and methods: Sixty-four 3Y-TZP discs were prepared, and subsequently, categorized into four distinct groups based on the conditioning regimen (n=16): Group 1 (SB), Group 2 (ECL), Group 3 (YFL), and Group 4 (LLLT-RB). The Ra assessment was performed on five samples from each group using a profilometer. One specimen from each group was subjected to surface topography analysis under a scanning electron microscope (SEM). A self-adhesive resin cement was built on ten samples from each group and photo polymerized, followed by artificial ageing. The SBS and failure modes were assessed using a universal testing machine and a stereomicroscope, respectively. The data was evaluated using ANOVA and a post hoc test, p = 0.05.
Results: Samples surface treated with YFL attained the highest Ra scores (1334.32 ± 0.065 µm) and highest bond strength (9.34±0.29 MPa). In contrast, the 3Y-TZP discs surface treated with LLLT-RB exhibited the lowest Ra value (870.56 ± 0.076 µm) and the lowest bond values (5.76±0.34 MPa). Zirconia disc surface treated with ECL and SB groups demonstrated admixed failures. LLLT (RB), on the other hand, exhibited adhesive fractures with the highest frequency.
Conclusion: Ytterbium fiber laser displayed the most satisfactory performance in terms of improving surface roughness and shear bond strength of zirconia with the resin cement, and can be used as an alternative surface pretreating regime for zirconia.