Abstract
Purpose: Whether electric arc welded and laser-welded Ni-Cr alloys can resist tensile stresses in the oral environment is unknown. Materials and Methods: Sixty Ni-Cr bars (0.8 mm × 60 mm) with a circular cross-section were cut in half and welded using laser welding and electric arc welding. Fifteen bars from both the group were immersed in artificial saliva at pH 7 and pH 2 at room temperature for 60 days and remaining 15 samples were used as control. After the stress corrosion simulation, the tensile strength was determined using universal testing machine. Results: On comparison between the electric arc welded and laser welded samples, the laser welded samples showed a significant decrease in the tensile strength after simulation in artificial saliva (P = 0.05). Oral condition simulation did not affect the tensile strength of electric arc welded samples (P < 0.001). Conclusion: Oral simulation decreased the tensile strength of laser welded Ni-Cr bars.
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