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The purpose of the present study was to evaluate the flexural strength of specimens made of nickel-chromium (Ni-Cr) and cobalt-chromium (Co-Cr) alloys and joined by tungsten inert gas (TIG) welding and conventional brazing. Ni–Cr and Co–Cr base metal specimens (n = 40, each) were cast and welded by TIG or brazing. The specimens were divided into six groups (2 base metals, four welded specimens). Ceramic systems were applied to the central part of all the specimens. A three-point bending test with a velocity of 0.5 mm/m was performed on the specimens up to the point of the first ceramic bond failure by measuring the flexural strength. Data were analyzed using two-way ANOVA and Bonferroni’s tests. Conventional welding showed the lowest flexural strength results for both alloys, while the TIG weld and the control group presented with varying bond strengths for the alloys studied. We concluded that TIG welding was superior to the conventional welding method for both Ni–Cr and Co–Cr alloys with regard to the flexural strength of the ceramic.References
Joias RM, Tango RN, Junho de Araujo JE, Junho de Araujo MA, Ferreira Anzaloni Saavedra Gde S, Paes-Junior TJ et al. Shear bond strength of a ceramic to Co-Cr alloys. J Prosthet Dent. 2008 Jan;99(1):54-9. doi: 10.1016/S0022-3913(08)60009-8.
Fischer J, Zbaren C, Stawarczyk B, Hämmerle CH. The effect of thermal cycling on metal-ceramic bond strength. J Dent. 2009 Jul;37(7):549-53. doi: 10.1016/j.jdent.2009.03.014.
Pretti M, Hilgert E, Bottino MA, Avelar RP. Evaluation of the shear bond strength of the union between two CoCr-alloys and a dental ceramic. J Appl Oral Sci. 2004 Dec;12(4):280-4.
Malo P, de Araujo Nobre M, Borges J, Almeida R. Retrievable metal ceramic implant-supported xed prostheses with milled titanium frameworks and all-ceramic crowns: retrospective clinical study with up to 10 years of follow-up. J Prosthodont. 2012 Jun;21(4):256-64. doi: 10.1111/j.1532-849X.2011.00824.x.
Dhima M, Paulusova V, Carr AB, Rieck KL, Lohse C, Salinas TJ. Practice-based clinical evaluation of ceramic single crowns after at least ve years. J Prosthet Dent. 2014 Feb;111(2):124-30. doi: 10.1016/j.prosdent.2013.06.015.
Scolaro JM, Pereira JR, do Valle AL, Bonfante G, Pegoraro LF. Comparative study of ceramic-to-metal bonding. Br Dent J. 2007; 18(3):240-3.
Hong JT, Shin SY. A comparative study on the bond strength of porcelain to the millingable Pd-Ag alloy. J Adv Prosthodont. 2014 Oct;6(5):372-8. doi: 10.4047/jap.2014.6.5.372.
Sipahi C, Ozcan M. Interfacial shear bond strength between different base metal alloys and ve low fusing feldspathic ceramic systems. Dent MaterJ. 2012;31(3):333-7.
Vasquez V, Ozcan M, Nishioka R, Souza R, Mesquita A, Pavanelli C. Mechanical and thermal cycling effects on the exural strength of glass ceramics fused to titanium. Dent MaterJ. 2008 Jan;27(1):715.
Galo R, Ribeiro RF, Rodrigues RC, Pagnano Vde O, Mattos Mda G. Effect of laser welding on the titanium ceramic tensile bond strength. J Appl Oral Sci. 2011 Aug;19(4):301-5.
Saito H, Hisanaga N, Okada Y, Hirai S, Arito H. Thorium-232 exposure during tungsten inert gas arc welding and electrode sharpening. Ind Health. 2003 Jul;41(3):273-8.
Bauer J, Costa JF, Carvalho CN, Grande RH, Loguercio AD, Reis A. Characterization of two Ni-Cr dental alloys and the in uence of casting mode on mechanical properties. J Prosthodont Res. 2012 Oct;56(4):264-71. doi: 10.1016/j.jpor.2012.02.004.
Bumgardner JD, Lucas LC: Surface analysis of nickel-chromium dental alloys. Dent Mater. 1993 Jul;9(4):252-9.
Costa EM, Neisser MP, Bottino MA. Multiple-unit implant frames: one-piece casting vs. laser welding and brazing. J Appl Oral Sci. 2004 Sep;12(3):227-31.
Orsi IA, Raimundo LB, Bezzon OL, Nóbilo MA, Kuri SE, Rovere CA, et al. Evaluation of anodic behavior of commercially pure titanium in tungsten inert gas and laser welds. J Prosthodont. 2011 Dec;20(8):628-31. doi: 10.1111/j.1532-849X.2011.00771.x.
Fattahi M, Nabhani N, Rashidkhani E, Fattahi Y, Akhavan S, Arabian N. A new technique for the strengthening of aluminum tungsten inert gas weld metals: using carbon nanotube/aluminum composite as a ller metal. Micron. 2013 Nov-Dec;54-55:28-35. doi: 10.1016/j.micron.2013.07.004.
Atoui JA, Felipucci DN, Pagnano VO, Orsi IA, Nóbilo MA, Bezzon OL. Tensile and exural strength of commercially pure titanium submitted to laser and tungsten inert gas welds. Braz Dent J. 2013 Nov-Dec;24(6):630-4. doi: 10.1590/0103-6440201302241.
Wang RR, Welsch GE. Joining titanium materials with tungsten inert gas welding, laser welding, and infrared brazing. J Prosthet Dent. 1995 Nov;74(5):521-30.
Bock JJ, Fraenzel W, Bailly J, Gernhardt CR, Fuhrmann RA. In uence of different brazing and welding methods on tensile strength and microhardness of orthodontic stainless steel wire. Eur J Orthod. 2008 Aug;30(4):396-400. doi: 10.1093/ejo/cjn022.
Atluri KR, Vallabhaneni TT, Tadi DP, Vadapalli SB, Tripuraneni SC, Averneni P. Comparative Evaluation of Metal-ceramic Bond Strengths of Nickel Chromium and Cobalt Chromium Alloys on Repeated Castings: An In vitro Study. J Int Oral Health. 2014 Sep;6(5):99-103.
Wu SC, Ho WF, Lin CW, Kikuchi H, Lin FT, Hsu HC. Surface characterization and bond strengths between Ti-20Cr-1X alloys and low-fusing porcelain. Dent Mater J. 2011;30(3):368-73.
Fernandes Neto AJ, Panzeri H, Neves FD, Prado RA, Mendonça G. Bond strength of three dental porcelains to Ni-Cr and Co-Cr-Ti alloys. Braz Dent J. 2006;17(1):24-8.
ISO 9693-1:2012. Dentistry—compatibility testing—part 1: metal-ceramic systems. Geneva, Switzerland: ISO; 2012.
Lee WV, Nicholls JI, Butson TJ, Daly CH. Fatigue life of a Nd:YAG laser-welded metal ceramic alloy. Int J Prosthodont. 1997 Sep-Oct;10(5):434-9.
Rocha R, Pinheiro AL, Villaverde AB. Flexural strength of pure Ti, Ni-Cr and Co-Cr alloys submitted to Nd:YAG laser or TIG welding. Braz Dent J. 2006;17(1):20-3.
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