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Journal of Prosthetic Dentistry

Effect of heating palladium-silver alloys on ceramic bond strength

      Abstract

      Statement of problem

      The effects of different heat treatments on the internal oxidation and metal–ceramic bond in Pd-Ag alloys with different trace elements require further documentation.

      Purpose

      The purpose of this in vitro study was to determine whether heat treatment affects the metal–ceramic bond strength of 2 Pd-Ag alloys containing different trace elements.

      Material and methods

      Thirteen cast specimens (25×3×0.5 mm) from each of 2 Pd-Ag alloy groups (W-1 and Argelite 61+3) were allocated to heat treatments before porcelain application: heating under reduced atmospheric pressure of 0.0014 MPa and 0.0026 MPa and heating under normal atmospheric pressure. Bond strengths were evaluated using a 3-point bending test according to ISO9693. Results were analyzed using 2-way ANOVA and Tukey HSD test (α=.05). Visual observation was used to determine the failure types of the fractured specimens. Scanning electron microscopy and energy dispersive spectroscopy were used to study morphologies, elemental compositions, and distributions in the specimens.

      Results

      The W-1 group had a mean bond strength significantly higher than that of Argelite 61+3 (P<.001). Heating under reduced atmospheric pressures of 0.0014 MPa and 0.0026 MPa resulted in similar bond strengths (P=.331), and both pressures had significantly higher bond strengths than that of heating under normal atmospheric pressure (P=.002, P<.001). Heating under different air pressures resulted in Pd-Ag alloys that contained either Sn or In and Ga, with various degrees of internal oxidation and different quantities of metallic nodules.

      Conclusions

      Heating under reduced atmospheric pressure effectively improved the bond strength of the ceramic-to-Pd-Ag alloys.
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      References

        • Joias R.M.
        • Tango R.N.
        • de Araujo J.E.J.
        • de Araujo M.A.J.
        • de Siqueira Ferreira Anzaloni Saavedra G.
        • de Arruda Paes-Junior T.J.
        • et al.
        Shear bond strength of a ceramic to Co-Cr alloys.
        J Prosthet Dent. 2008; 99: 54-59
        • Vojdani M.
        • Shaghaghian S.
        • Khaledi A.
        • Adibi S.
        The effect of thermal and mechanical cycling on bond strength of a ceramic to nickel-chromium (Ni-Cr) and cobalt-chromium (Co-Cr) alloys.
        Indian J Dent Res. 2012; 23: 509-513
        • Goodacre C.J.
        Palladium–silver alloys: a review of the literature.
        J Prosthet Dent. 1989; 62: 34-37
        • Stavridakis M.M.
        • Papazoglou E.
        • Seghi R.R.
        • Johnston W.M.
        • Brantley W.A.
        Effect of different high-palladium metal–ceramic alloys on the color of opaque and dentin porcelain.
        J Prosthet Dent. 2004; 92: 170-178
        • Roberts H.W.
        • Berzins D.W.
        • Moore B.K.
        • Charlton D.G.
        Metal–ceramic alloys in dentistry: a review.
        J Prosthodont. 2009; 18: 188-194
        • Bagby M.
        • Marshall S.J.
        • Marshall Jr., G.W.
        Metal-ceramic compatibility: a review of the literature.
        J Prosthet Dent. 1990; 63: 21-25
        • Mackert J.R.
        • Ringle R.D.
        • Fairhurst C.W.
        High-temperature behavior of a Pd–Ag alloy for porcelain.
        J Dent Res. 1983; 62: 1229-1235
        • Li B.H.
        • Ye J.T.
        • Liao J.K.
        • Zhuang P.L.
        • Zhang Y.P.
        • Li J.Y.
        Effect of pretreatments on the metal-ceramic bonding strength of a Pd–Ag alloy.
        J Dent. 2014; 42: 319-328
        • Schweitzer D.M.
        • Goldstein G.R.
        • Ricci J.L.
        • Silva N.R.
        • Hittelman E.L.
        Comparison of bond strength of a pressed ceramic fused to metal versus feldspathic porcelain fused to metal.
        J Prosthodont. 2005; 14: 239-247
        • Johnson T.
        • van Noort R.
        • Stokes C.W.
        Surface analysis of porcelain fused to metal systems.
        Dent Mater. 2006; 22: 330-337
        • Shimizu T.
        • Goto S.
        • Oqura H.
        Effects of Sn, Ga, and In additives on properties of Ag-Pd-Au-Cu alloy for ultra-low fusing ceramics.
        Dent Mater J. 2001; 20: 286-304
        • Guo W.H.
        • Brantley W.A.
        • Li D.
        • Clark W.A.
        • Monaghan P.
        • Heshmati R.H.
        Annealing study of palladium–silver dental alloys: Vickers hardness measurements and SEM microstructural observations.
        J Mater Sci Mater Med. 2007; 18: 111-118
        • Scolaro J.M.
        • Pereira J.R.
        • do Valle A.L.
        • Bonfante G.
        • Pegoraro L.F.
        Comparative study of ceramic-to-metal bonding.
        Braz Dent J. 2007; 18: 240-243
        • Lombardo G.H.
        • Nishioka R.S.
        • Souza R.O.
        • Michida S.M.
        • Kojima A.N.
        • Mesquita A.M.
        • et al.
        Influence of surface treatment on the shear bond strength of ceramics fused to cobalt-chromium.
        J Prosthodont. 2010; 19: 103-111
        • Sadeq A.
        • Cai Z.
        • Woody R.D.
        • Miller A.W.
        Effects of interfacial variables on ceramic adherence to cast and machined commercially pure titanium.
        J Prosthet Dent. 2013; 90: 10-17
        • Yao L.
        • Peng C.
        • Wu J.
        Wettability and bond strength between leucite-reinforced dental porcelains and Co-Cr alloy.
        J Prosthet Dent. 2013; 110: 515-520
        • Jochen D.G.
        • Caputo A.A.
        • Matyas J.
        Effect of opaque porcelain application on strength of bond to silver-palladium alloys.
        J Prosthet Dent. 1990; 63: 414-418
      1. International Organization for Standardization. ISO 9693:1999(E). Metal–ceramic dental restorative systems. Available at: http://www.iso.ch/iso/en/prods-services/ISOstore/store.html. Accessed October 12, 2013.

        • Oliveira de Vasconcellos L.G.
        • Silva L.H.
        • Reis de Vasconcellos L.M.
        • Balducci I.
        • Takahashi F.E.
        • Bottino M.A.
        Effect of airborne- particle abrasion and mechanic-thermal cycling on the flexural strength of glass ceramic fused to gold or cobalt-chromium alloy.
        J Prosthodont. 2011; 20: 553-560
        • Wataha J.C.
        Alloys for prosthodontic restorations.
        J Prosthet Dent. 2002; 87: 351-363
        • Limkool P.
        • Sumii T.
        Study of a Pd–Ag-Sb system alloy for metal–ceramics.
        Bulletin of Tokyo Dent Coll. 1995; 36: 103-114
        • Papazoglou E.
        • Brantley W.A.
        • Mitchell J.C.
        • Cai Z.
        • Carr A.B.
        New high-palladium casting alloys: studies of the interface with porcelain.
        Int J Prosthodont. 1996; 9: 315-322