Akademik Veri Yönetim Sistemi
Journal of Prosthetic Dentistry, 2026 (SCI-Expanded, Scopus)
Statement of problem: Airborne-particle abrasion and tribochemical silica coating are well established as surface treatments to enhance the metal–ceramic bond strength of cobalt chromium (Co-Cr) alloys, but nanosecond ytterbium fiber and femtosecond Ti:sapphire laser texturing have been proposed as alternatives. However, their effects on the metal–ceramic bond strength, surface roughness, and surface chemistry of selective laser melted Co-Cr frameworks have not been directly compared. Purpose: The purpose of this in vitro study was to compare, on selective laser melting Co Cr frameworks, the effects of airborne-particle abrasion, tribochemical silica coating, nanosecond ytterbium fiber laser texturing, and femtosecond Ti:sapphire laser texturing on metal–ceramic bond strength and to relate bond strength to surface roughness (Ra, Rz) and surface elemental composition using energy-dispersive X-ray spectroscopy (EDS). Material and methods: Fifty-two selective laser melting Co-Cr bars were randomly allocated to 4 surface treatment groups: airborne-particle abrasion (APA) with 110-µm Al₂O₃, tribochemical silica coating (TC), nanosecond ytterbium fiber laser (NS), and femtosecond Ti:sapphire laser (FS). After surface treatment, a feldspathic porcelain was applied, and metal–ceramic bond strength was evaluated using 3-point bending. Surface roughness parameters (Ra, Rz) were measured using contact profilometry, and surface elemental composition was analyzed using EDS. Data were analyzed using parametric and nonparametric tests (α=.05). Results: Mean ±standard deviation bond strengths (MPa) were 32.0 ±5.2 (APA), 32.6 ±7.2 (TC), 32.7 ±6.0 (NS), and 27.2 ±5.4 (FS). Bond strength was significantly lower in the FS group than in the other groups (P<.05), with no significant differences among APA, TC, and NS (P>.05). NS produced the highest Ra and Rz values, whereas FS produced the lowest Rz. Bond strength showed a weak positive correlation with Rz but no significant correlation with Ra. EDS revealed the lowest oxygen content in the FS group (3.73%) and the highest oxygen and silica contents in the TC group (26.20% and 15.17%, respectively). Conclusions: On selective laser melting Co-Cr frameworks, airborne-particle abrasion, tribochemical silica coating, and nanosecond laser texturing produced comparable metal–ceramic bond strengths that exceeded the 25-MPa minimum requirement. Femtosecond laser texturing resulted in significantly lower, although still acceptable, bond strength values with the parameters used.