Thermo and mechanical cycling and veneering method do not influence Y-TZP core/veneer interface bond strength

Author(s)

Vidotti, Hugo Alberto ^[1] ; Pereira, Jefferson Ricardo ^[2] ; Insaurralde, Elizeu ^[3] ; Pompeia Fraga de Almeida, Ana Lucia ^[1] ; do Valle, Accacio Lins ^[1]

Affiliation

^[1] Univ Sao Paulo, Dept Prosthodont, Bauru Sch Dent, Bauru, SP - Brazil

^[2] Univ Southern Santa Catarina, Sch Dent, Tubarao, SC - Brazil

^[3] Univ South Mato Grosso, Sch Dent, Dept Prosthodont & Restorat Dent, Campo Grande, MS - USA

• Document type: Journal article
• Source: Journal of Dentistry; v. 41, n. 4, p. 307-312, APR 2013.
• Web of Science Citations: 12

Abstract

Objectives: The purpose of this study was to evaluate the influence of thermal and mechanical cycling and veneering technique on the shear bond strength of Y-TZP (yttrium oxide partially stabilized tetragonal zirconia polycrystal) core-veneer interfaces. Materials and methods: Cylindrical Y-TZP specimens were veneered either by layering (n = 20) or by pressing technique (n = 20). A metal ceramic group (CoCr) was used as control (n = 20). Ten specimens for each group were thermal and mechanical cycled and then all samples were subjected to shear bond strength in a universal testing machine with a 0.5 mm/min crosshead speed. Mean shear bond strength (MPa) was analysed with a 2-way analysis of variance and Tukey's test (p < 0.05). Failure mode was determined using stereomicroscopy and scanning electron microscopy (SEM). Results: Thermal and mechanical cycling had no influence on the shear bond strength for all groups. The CoCr group presented the highest bond strength value (p < 0.05) (34.72 +/- 7.05 MPa). There was no significant difference between Y-TZP veneered by layering (22.46 +/- 2.08 MPa) or pressing (23.58 +/- 2.1 MPa) technique. Failure modes were predominantly adhesive for CoCr group, and cohesive within veneer for Y-TZP groups. Conclusions: Thermal and mechanical cycling, as well as the veneering technique does not affect Y-TZP core-veneer bond strength. Clinical significance: Different methods of veneering Y-TZP restorations would not influence the clinical performance of the core/veneer interfaces. (C) 2012 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 09/17066-9 - Influence of thermal and mechanical loading on shear bond strength of porcelain to infrastructure of different allceram systems
• Grantee: Accacio Lins do Valle
• Support Opportunities: Regular Research Grants
• FAPESP's process: 09/03892-4 - Influence of thermal and mechanical loading on shear bond strength of porcelain to infrastructure of different allceram systems
• Grantee: Hugo Alberto Vidotti
• Support Opportunities: Scholarships in Brazil - Master