Durability of feldspathic veneering ceramic on glass-infiltrated alumina ceramics after long-term thermocycling.
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2010-07-01
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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.
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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
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Inglês
Como citar
Minerva stomatologica, v. 59, n. 7-8, p. 393-399, 2010.
