title: Comparison of joint designs for laser welding of cast metal plates and wrought wires.
abstract: The purpose of the present study was to compare joint designs for the laser welding of cast metal plates and wrought wire, and to evaluate the welded area internally using X-ray micro-focus computerized tomography (micro-CT). Cast metal plates (Ti, Co-Cr) and wrought wires (Ti, Co-Cr) were welded using similar metals. The specimens were welded using four joint designs in which the wrought wires and the parent metals were welded directly (two designs) or the wrought wires were welded to the groove of the parent metal from one or both sides (n = 5). The porosity and gap in the welded area were evaluated by micro-CT, and the maximum tensile load of the welded specimens was measured with a universal testing machine. An element analysis was conducted using an electron probe X-ray microanalyzer. The statistical analysis of the results was performed using Bonferroni's multiple comparisons (α = 0.05). The results included that all the specimens fractured at the wrought wire when subjected to tensile testing, although there were specimens that exhibited gaps due to the joint design. The wrought wires were affected by laser irradiation and observed to melt together and onto the filler metal. Both Mo and Sn elements found in the wrought wire were detected in the filler metal of the Ti specimens, and Ni was detected in the filler metal of the Co-Cr specimens. The four joint designs simulating the designs used clinically were confirmed to have adequate joint strength provided by laser welding.
authors.affiliation: Department of Removable Prosthodontics, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama, Japan. takayama-y@tsurumi-u.ac.jp
authors.forename: Yasuko
authors.initials: Y
authors.lastname: Takayama
authors.forename: Rie
authors.initials: R
authors.lastname: Nomoto
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nakajima
authors.forename: Chikahiro
authors.initials: C
authors.lastname: Ohkubo
mesh_terms: D002858:Chromium Alloys; D003722:Dental Alloys; D003734:Dental Casting Investment; D017267:Dental Prosthesis Design; D012994:Dental Soldering / Q000379:methods*; D003799:Dental Stress Analysis; D003780:Denture Repair / Q000379:methods*; D020342:Finite Element Analysis; D013718:Tensile Strength; D014025:Titanium; D014896:Welding / Q000379:methods; D055114:X-Ray Microtomography
chemical_list: D002858:Chromium Alloys; D003722:Dental Alloys; D003734:Dental Casting Investment; D014025:Titanium
references.citation: Dent Mater. 1988 Oct;4(5):255-60
references.pmid: 2907885
references.citation: J Prosthet Dent. 1995 Nov;74(5):521-30
references.pmid: 8809260
references.citation: Dent Mater. 2004 Dec;20(10):972-8
references.pmid: 15501326
references.citation: Eur J Orthod. 2008 Aug;30(4):396-400
references.pmid: 18617503
references.citation: J Prosthodont Res. 2009 Apr;53(2):53-9
references.pmid: 19318073
references.citation: Dent Mater J. 2009 Jan;28(1):121-7
references.pmid: 19280977
references.citation: Br Dent J. 2004 Apr 10;196(7):413-8; discussion 407
references.pmid: 15071534
references.citation: J Prosthet Dent. 2006 Oct;96(4):273-82
references.pmid: 17052472
references.citation: J Oral Rehabil. 1982 Nov;9(6):531-7
references.pmid: 6960163
references.citation: Arch Oral Biol. 1986;31(10):669-78
references.pmid: 3477211
references.citation: Int Dent J. 1993 Jun;43(3):245-53
references.pmid: 8406955
references.citation: J Prosthet Dent. 2005 Feb;93(2):183-8
references.pmid: 15674231
references.citation: Dent Mater. 2010 Dec;26(12):e246-52
references.pmid: 20828805
references.citation: J Prosthet Dent. 1993 Sep;70(3):264-73
references.pmid: 8105079
references.citation: Dent Mater. 2002 Mar;18(2):143-8
references.pmid: 11755593
references.citation: Aust Dent J. 1977 Aug;22(4):243-6
references.pmid: 354621
references.citation: J Prosthet Dent. 2004 Apr;91(4):374-82
references.pmid: 15116040
references.citation: Am J Dent. 2003 Aug;16(4):231-4
references.pmid: 14579875
references.citation: Acta Odontol Scand. 1988 Aug;46(4):247-53
references.pmid: 2903608
references.citation: J Oral Rehabil. 2002 Jul;29(7):627-33
references.pmid: 12153451
references.citation: Lasers Surg Med. 1995;16(2):103-33
references.pmid: 7769957
references.citation: J Biomed Mater Res B Appl Biomater. 2008 Jan;84(1):147-53
references.pmid: 17514661
references.citation: J Orthod. 2009 Jun;36(2):78-84
references.pmid: 19487737
references.citation: J Prosthet Dent. 1995 Jan;73(1):4-7
references.pmid: 7699598
references.citation: J Prosthet Dent. 1998 Mar;79(3):291-7
references.pmid: 9553882
references.citation: J Prosthet Dent. 1995 Sep;74(3):250-7
references.pmid: 7473278
references.citation: J Dent Res. 1983 Dec;62(12):1226-8
references.pmid: 6140276
references.citation: J Prosthet Dent. 1993 Apr;69(4):369-73
references.pmid: 8463964
references.citation: J Dent Technol. 1996 May;13(4):23-31
references.pmid: 9516260
references.citation: Br Dent J. 2001 Mar 10;190(5):255-7
references.pmid: 11303685
references.citation: Dent Mater. 1993 Mar;9(2):104-7
references.pmid: 8595837
references.citation: J Osaka Univ Dent Sch. 1990 Dec;30:131-8
references.pmid: 1983361