Laser welding investigation of orthodontic titanium-based wires

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The purpose of the present study was to investigate laser welding characteristics for orthodontic wires using measuring tensile strength, characterizing morphology of the joint region, and determining phases by Micro-XRD. Beta-Ti, Ni-Ti and Co-Cr-Ni wires with cross-section dimensions of 0.016×0.022 inch were selected. Laser welding was performed at voltages ranging from 150 to 230 V. Tensile strength ranged from 167 to 416 MPa for the laser-welded Ni-Ti specimens and from 281 to 806 MPa for the laser-welded beta-Ti specimens. Tensile strength for laser-welded Co-Cr-Ni specimens ranged from 515 to 908 MPa, which was significantly lower than for control specimens (1421 MPa) joined by conventional silver-based soldering (P<0.05). For each wire type of specimen, increasing voltage of the laser welding procedure increased the localized fusing region. For most Micro-XRD spectra obtained at 1 mm distance from the joint of laser-welded Ni-Ti and beta-Ti specimens, intensities of the principal peaks for austenitic NiTi and beta-Ti increased, indicating that those regions were annealed by laser welding. Micro-XRD spectra obtained 2 mm distance from the joint for each wire type were similar to as-received specimens. In conclusion, laser-welding of beta-titanium and Co-Cr-Ni wires may be acceptable for clinical use, since the joints had sufficient strength and the original crystal structure of each wire type adjacent to the joint was not greatly altered.
北海道矯正歯科学会の論文
2005-12-23

Laser welding investigation of orthodontic titanium-based wires

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