Post-fatigue fracture resistance of metal core crowns: press-on metal ceramic versus a conventional veneering system
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Solá Ruiz, María Fernanda; Agustín Panadero, Rubén; Campos Estellés, Carlos; Labaig Rueda, Carlos
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Aquest document és un/a article, creat/da en: 2015
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Background: The aim of this in vitro study was to compare the mechanical failure behavior and to analyze fracture
characteristics of metal ceramic crowns with two veneering systems – press-on metal (PoM) ceramic versus a conventional veneering system – subjected to static compressive loading.
Material and Methods: Forty-six crowns were constructed and divided into two groups according to porcelain veneer manufacture. Group A: 23 metal copings with porcelain IPS-InLine veneering (conventional metal ceramic).
Group B: 23 metal copings with IPS-InLine PoM veneering porcelain. After 120,000 fatigue cycles, the crowns
were axially loaded to the moment of fracture with a universal testing machine. The fractured specimens were examined under optical stereomicroscopy and scanning electron microscope.
Results: Fracture resistance values showed statistically significant differences (Student’s t-test) regarding the type
of ceramic veneering technique (
p
=0.001): Group A (conventional metal ceramics) obtained a mean fracture resistance of 1933.17 N, and Group B 1325.74N (Press-on metal ceramics). The most common type of fracture was
adhesive failure (with metal exposure) (
p
=0.000). Veneer porcelain fractured on the occlusal surface following a
radial pattern.
Conclusions: Metal ceramic crowns made of IPS InLine or IPS InLine PoM ceramics with different laboratory
techniques all achieved above-average values for clinical survival in the oral environment according to ISO 6872.
Crowns made with IPS InLine by conventional technique resisted fracture an average of 45% more than IPS InLine
PoM fabricated with the press-on technique
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