title: Effect of Nd:YAG laser parameters on the penetration depth of a representative Ni-Cr dental casting alloy.
abstract: The effects of voltage and laser beam (spot) diameter on the penetration depth during laser beam welding in a representative nickel-chromium (Ni-Cr) dental alloy were the subject of this study. The cast alloy specimens were butted against each other and laser welded at their interface using various voltages (160-390 V) and spot diameters (0.2-1.8 mm) and a constant pulse duration of 10 ms. After welding, the laser beam penetration depths in the alloy were measured. The results were plotted and were statistically analyzed with a two-way ANOVA, employing voltage and spot diameter as the discriminating variables and using Holm-Sidak post hoc method (a = 0.05). The maximum penetration depth was 4.7 mm. The penetration depth increased as the spot diameter decreased at a fixed voltage and increased as the voltage increased at a fixed spot diameter. Varying the parameters of voltage and laser spot diameter significantly affected the depth of penetration of the dental cast Ni-Cr alloy. The penetration depth of laser-welded Ni-Cr dental alloys can be accurately adjusted based on the aforementioned results, leading to successfully joined/repaired dental restorations, saving manufacturing time, reducing final cost, and enhancing the longevity of dental prostheses.
authors: Dental Biomaterials Research and Development Chair, College of Dentistry, King Saud University, P.O. Box 60169, Riyadh, 11545, Saudi Arabia, yaljabbari@ksu.edu.sa.
authors: Youssef S
authors: YS
authors: Al Jabbari
authors: Theodoros
authors: T
authors: Koutsoukis
authors: Xanthoula
authors: X
authors: Barmpagadaki
authors: Ehab A
authors: EA
authors: El-Danaf
authors: Raymond A
authors: RA
authors: Fournelle
authors: Spiros
authors: S
authors: Zinelis
mesh_terms: D002858:Chromium Alloys / Q000494:pharmacology*; D003722:Dental Alloys / Q000494:pharmacology*; D003735:Dental Casting Technique; D012994:Dental Soldering; D053844:Lasers, Solid-State; D014896:Welding
chemical_list: D002858:Chromium Alloys; D003722:Dental Alloys