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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/71770
Title: 
Durability of feldspathic veneering ceramic on glass-infiltrated alumina ceramics after long-term thermocycling.
Author(s): 
Institution: 
Universidade Estadual Paulista (UNESP)
ISSN: 
0026-4970
Abstract: 
This study compared the bond strength durability of a feldspathic veneering ceramic to glass-infiltrated reinforced ceramics in dry and aged conditions. Disc shaped (thickness: 4 mm, diameter: 4 mm) of glass-infiltrated alumina (In-Ceram Alumina) and glass-infiltrated alumina reinforced by zirconia (In-Ceram Zirconia) core ceramic specimens (N=48, N=12 per groups) were constructed according to the manufacturers' recommendations. Veneering ceramic (VITA VM7) was fired onto the core ceramics using a mold. The core-veneering ceramic assemblies were randomly divided into two conditions and tested either immediately after specimen preparation (Dry) or following 30000 thermocycling (5-55 oC±1; dwell time: 30 seconds). Shear bond strength test was performed in a universal testing machine (cross-head speed: 1 mm/min). Failure modes were analyzed using optical microscope (x20). The bond strength data (MPa) were analyzed using ANOVA (α=0.05). Thermocycling did not decrease the bond strength results for both In-Ceram Alumina (30.6±8.2 MPa; P=0.2053) and In-Ceram zirconia (32.6±9 MPa; P=0.3987) core ceramic-feldspathic veneering ceramic combinations when compared to non-aged conditions (28.1±6.4 MPa, 29.7±7.3 MPa, respectively). There were also no significant differences between adhesion of the veneering ceramic to either In-Ceram Alumina or In-Ceram Zirconia ceramics (P=0.3289). Failure types were predominantly a mixture of adhesive failure between the veneering and the core ceramic together with cohesive fracture of the veneering ceramic. Long-term thermocycling aging conditions did not impair the adhesion of the veneering ceramic to the glass-infiltrated alumina core ceramics tested.
Issue Date: 
1-Jul-2010
Citation: 
Minerva stomatologica, v. 59, n. 7-8, p. 393-399, 2010.
Time Duration: 
393-399
Keywords: 
  • glass
  • In Ceram Alumina
  • In Ceram Zirconia
  • In-Ceram Alumina
  • In-Ceram Zirconia
  • VITA VM7
  • ceramics
  • comparative study
  • dental bonding
  • denture
  • equipment
  • evaluation
  • heat
  • humidity
  • in vitro study
  • materials testing
  • randomization
  • shear strength
  • time
  • tooth prosthesis
  • Ceramics
  • Dental Bonding
  • Dental Porcelain
  • Dental Veneers
  • Equipment Failure
  • Glass
  • Hot Temperature
  • Humidity
  • Materials Testing
  • Random Allocation
  • Shear Strength
  • Time Factors
Source: 
http://www.minervamedica.it/en/journals/minerva-stomatologica/article.php?cod=R18Y2010N07A0393
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/71770
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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