Influence of Fiber Laser 1064 Nm Processing parameters on surface Topography of Titanium discs
Objectives: This work was performed for enhancement of titanium abutment retention to crown by surface modification using fiber laser 1064 nm considering (hatch distance, scanning speed, frequency and average power). Materials and methods: Titanium specimens of 6 mm diameter and 3 mm thickness (disk form) were prepared. Q-switched nanosecond fiber laser of 1064 nm wavelength ,81 ns pulse duration, 6.6 mm beam diameter, 0.01 mm spot size was used for surface modification of titanium specimens. Titanium specimens were categorized into four groups according to the variation in laser parameters (1) hatch distance group, (2) scanning speed group, (3) frequency group and (4) average power group. Characterization of the specimens was performed by optical microscope, scanning electron microscope (SEM), and surface roughness tester. Phase analysis was performed by X-ray diffractometer (XRD). Results: The results of this work showed that the surface roughness was increased with the increasing in the hatch distance up to 0.1 mm then decreased when the hatch distance was 0.15 mm .The surface roughness was indirectly proportionate with the increased scanning speed. Furthermore, surface roughness was increased with the increasing in the average power up to 10 W but this relation was inversely proportionated when the average power was increased up to 50 W. A clear relationship between average surface roughness and frequency was not observed. Conclusion: Using of fiber laser can be effectively modify the surface of titanium abutment considering (the standoff distance, hatch distance, scanning speed, average power and frequency).