Shear bond strengths of a ceramic system to alternative metal alloys.
BACKGROUND
The success of metal-ceramic restorations is influenced by the compatibility between base metal alloys and porcelains. Although porcelain manufacturers recommend their own metal systems as the most compatible for fabricating metal-ceramic prostheses, a number of alloys have been used. Purpose This study evaluated the shear bond strength between a porcelain system and 4 alternative alloys.


METHODS
Two Ni-Cr alloys: 4 ALL and Wiron 99, and 2 Co-Cr alloys: IPS d.SIGN 20 and Argeloy NP were selected for this study. The porcelain (IPS d.Sign porcelain system) portion of the cylindrical metal-ceramic specimens was 4 mm thick and 4 mm high; the metal portion was machined to 4x4 mm, with a base that was 5 mm thick and 1 mm high. Forty-four specimens were prepared (n=11). Ten specimens from each group were subjected to a shear load on a universal testing machine using a 1 mm/min crosshead speed. One specimen from each group was observed with a scanning electron microscope. Stress at failure (MPa) was determined. The data were analyzed with a 1-way analysis of variance (alpha=.05).


RESULTS
The groups, all including IPS d.Sign porcelain, presented the following mean bond strengths (+/-SD) in MPa: 4 ALL, 54.0+/-20.0; Wiron, 63.0+/-13.5; IPS d.SIGN 20, 71.7+/-19.2; Argeloy NP, 55.2+/-13.5. No significant differences were found among the shear bond strength values for the metal-ceramic specimens tested.


CONCLUSIONS
None of the base metal alloys studied demonstrated superior bond strength to the porcelain tested.
de Melo
Renata Marques
RM
San José dos Campos Dental School, Paulista State University, São José dos Campos, São Paulo, Brazil. marquesdemelo@bol.com.br
Travassos
Alessandro Caldas
AC
Neisser
Maximiliano Piero
MP
D000704:Analysis of Variance; D002858:Chromium Alloys; D001840:Dental Bonding / Q000379:methods*; D003776:Dental Porcelain; D008422:Materials Testing / Q000379:methods; D016876:Metal Ceramic Alloys; D008855:Microscopy, Electron, Scanning; D033081:Shear Strength
D002858:Chromium Alloys; D016876:Metal Ceramic Alloys; D003776:Dental Porcelain