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Comparison of Bond Strength of a Pressed Ceramic Fused to Metal versus Feldspathic Porcelain Fused to Metal
Author(s) -
Schweitzer Daniel M.,
Goldstein Gary R.,
Ricci John L.,
Silva N.R.F.A.,
Hittelman Eugene L.
Publication year - 2005
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2005.00052.x
Subject(s) - materials science , ceramic , leucite , alloy , metal , composite material , crosshead , universal testing machine , dental porcelain , base metal , flexural strength , metallurgy , ultimate tensile strength , welding
Purpose : To compare the debonding/crack initiation strength (D/CIS) of a low‐fusing pressable leucite‐based glass ceramic (PC) fused to metal to a feldspathic porcelain (FP) fused to metal.Materials & Methods : As per ISO 9693:1999, 40 rectangular metal specimens (25.0 mm × 0.5 mm × 3.0 mm) were prepared. Twenty of the specimens were cast in a base metal nickel‐chromium alloy (BA), and 20 were cast in a noble metal palladium‐silver alloy (NA). Ten randomly selected NA and BA alloy specimens had FP applied. The remaining 10 NA and BA alloy specimens had ash‐free wax patterns applied, the metal‐wax complexes invested, and were pressed with a PC. The dimensions of the ceramic specimens were 8.0 mm × 1.0 mm × 3.0 mm, creating a combined metal‐ceramic complex thickness of 1.5 mm. All specimens were subject to a three‐point bending test at a crosshead speed of 1.5 mm/min. Fracture loads were recorded in Newtons and D/CISs calculated by the formula τ b = k × F fail .Results : Mean D/CISs, measured in MPa (standard deviations): NA‐FP 32.56 (4.62), NA‐PC 30.23 (5.06), BA‐FP 30.98 (4.41), and BA‐PC 31.81 (3.48). A two‐way ANOVA ( p > 0.05) did not demonstrate significant difference between groups.Conclusion : The debonding/crack initiation strength of a low‐fusing pressable leucite‐based glass ceramic fused to metal was equivalent to that of a feldspathic porcelain fused to metal.