Fatigue resistance of simplified CAD–CAM restorations: Foundation material and ceramic thickness effects on the fatigue behavior of partially- and fully-stabilized zirconia

R.V. Machry; A.C. Cadore-Rodrigues; A.L.S. Borges; G.K.R. Pereira; C.J. Kleverlaan; A.B. Venturini; L.F. Valandro

doi:10.1016/j.dental.2021.01.001

Fatigue resistance of simplified CAD–CAM restorations: Foundation material and ceramic thickness effects on the fatigue behavior of partially- and fully-stabilized zirconia

R.V. Machry, A.C. Cadore-Rodrigues, A.L.S. Borges, G.K.R. Pereira, C.J. Kleverlaan, A.B. Venturini, L.F. Valandro

Oral Regenerative Medicine (ORM)

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

© 2021 The Academy of Dental MaterialsObjective: To evaluate the fatigue failure load, number of cycles until failure and survival probability of partially (PSZ) and fully-stabilized (FSZ) polycrystalline zirconia disc shaped specimens with different thicknesses adhesively cemented onto foundations with distinct elastic moduli. Methods: Disc-shaped specimens (n = 15, Ø = 10 mm; thickness = 1.0 and 0.7 mm) of CAD/CAM PSZ and FSZ blocks were adhesively cemented onto discs with different foundations (Ø = 10 mm; thickness = 2.0 mm) made from epoxy resin, composite resin or Ni–Cr metallic alloy. The cemented assemblies were subjected to fatigue testing using a step-stress approach (600−2800 N; step-size of 100 N; 10,000 cycles per step; 20 Hz) and the data was submitted to specific statistical tests (α = 0.05). Fractography and finite element (FEA) analyzes were also performed. Results: PSZ and FSZ presented higher fatigue failure load, number of cycles until failure and survival probabilities when cemented onto metallic alloy. All PSZ specimens survived the fatigue test when cemented onto Ni–Cr alloy (100% probability of survival at 2800 N; 230,000 cycles). Regardless of the foundation type, PSZ had better fatigue behavior than FSZ. For thickness, thinner PSZ restorations underperformed when bonded to softer foundations, while FSZ groups and groups bonded to metallic foundations had no statistical difference. Significance: The foundation material strongly influences the fatigue performance of PSZ and FSZ restorations, which presented mechanical behavior improvements when bonded to a metallic foundation. PSZ restorations showed better fatigue behavior than FSZ, while the ceramic thickness only influenced PSZ restorations bonded to softer foundations.

Original language	English
Pages (from-to)	568-577
Journal	Dental Materials
Volume	37
Issue number	4
DOIs	https://doi.org/10.1016/j.dental.2021.01.001
Publication status	Published - 1 Apr 2021

Funding

This study was partly financed by the Brazilian Federal Agency for Coordination of Improvement of Higher Education Personnel ( CAPES) – Finance Code 001 and the Foundation for Research Support of the Rio Grande do Sul State, Brazil – FAPERGS (A.B.V. post-doctorate scholarship; grant # 18/2551-0000520-7) . We especially thank Ivoclar Vivadent for donating the research materials, and finally we emphasize that those institutions had no role in the scientific decisions of this study.

Funders	Funder number
Brazilian Federal Agency for Coordination of Improvement of Higher Education Personnel
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior	001
Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul	18/2551-0000520-7
Universidade Federal do Rio Grande do Sul

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Machry, R. V., Cadore-Rodrigues, A. C., Borges, A. L. S., Pereira, G. K. R., Kleverlaan, C. J., Venturini, A. B., & Valandro, L. F. (2021). Fatigue resistance of simplified CAD–CAM restorations: Foundation material and ceramic thickness effects on the fatigue behavior of partially- and fully-stabilized zirconia. Dental Materials, 37(4), 568-577. https://doi.org/10.1016/j.dental.2021.01.001

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title = "Fatigue resistance of simplified CAD–CAM restorations: Foundation material and ceramic thickness effects on the fatigue behavior of partially- and fully-stabilized zirconia",

abstract = "{\textcopyright} 2021 The Academy of Dental MaterialsObjective: To evaluate the fatigue failure load, number of cycles until failure and survival probability of partially (PSZ) and fully-stabilized (FSZ) polycrystalline zirconia disc shaped specimens with different thicknesses adhesively cemented onto foundations with distinct elastic moduli. Methods: Disc-shaped specimens (n = 15, {\O} = 10 mm; thickness = 1.0 and 0.7 mm) of CAD/CAM PSZ and FSZ blocks were adhesively cemented onto discs with different foundations ({\O} = 10 mm; thickness = 2.0 mm) made from epoxy resin, composite resin or Ni–Cr metallic alloy. The cemented assemblies were subjected to fatigue testing using a step-stress approach (600−2800 N; step-size of 100 N; 10,000 cycles per step; 20 Hz) and the data was submitted to specific statistical tests (α = 0.05). Fractography and finite element (FEA) analyzes were also performed. Results: PSZ and FSZ presented higher fatigue failure load, number of cycles until failure and survival probabilities when cemented onto metallic alloy. All PSZ specimens survived the fatigue test when cemented onto Ni–Cr alloy (100% probability of survival at 2800 N; 230,000 cycles). Regardless of the foundation type, PSZ had better fatigue behavior than FSZ. For thickness, thinner PSZ restorations underperformed when bonded to softer foundations, while FSZ groups and groups bonded to metallic foundations had no statistical difference. Significance: The foundation material strongly influences the fatigue performance of PSZ and FSZ restorations, which presented mechanical behavior improvements when bonded to a metallic foundation. PSZ restorations showed better fatigue behavior than FSZ, while the ceramic thickness only influenced PSZ restorations bonded to softer foundations.",

author = "R.V. Machry and A.C. Cadore-Rodrigues and A.L.S. Borges and G.K.R. Pereira and C.J. Kleverlaan and A.B. Venturini and L.F. Valandro",

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doi = "10.1016/j.dental.2021.01.001",

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Machry, RV, Cadore-Rodrigues, AC, Borges, ALS, Pereira, GKR, Kleverlaan, CJ, Venturini, AB & Valandro, LF 2021, 'Fatigue resistance of simplified CAD–CAM restorations: Foundation material and ceramic thickness effects on the fatigue behavior of partially- and fully-stabilized zirconia', Dental Materials, vol. 37, no. 4, pp. 568-577. https://doi.org/10.1016/j.dental.2021.01.001

Fatigue resistance of simplified CAD–CAM restorations: Foundation material and ceramic thickness effects on the fatigue behavior of partially- and fully-stabilized zirconia. / Machry, R.V.; Cadore-Rodrigues, A.C.; Borges, A.L.S. et al.
In: Dental Materials, Vol. 37, No. 4, 01.04.2021, p. 568-577.

Research output: Contribution to Journal › Article › Academic › peer-review

TY - JOUR

T1 - Fatigue resistance of simplified CAD–CAM restorations

T2 - Foundation material and ceramic thickness effects on the fatigue behavior of partially- and fully-stabilized zirconia

AU - Machry, R.V.

AU - Cadore-Rodrigues, A.C.

AU - Borges, A.L.S.

AU - Pereira, G.K.R.

AU - Kleverlaan, C.J.

AU - Venturini, A.B.

AU - Valandro, L.F.

PY - 2021/4/1

Y1 - 2021/4/1

N2 - © 2021 The Academy of Dental MaterialsObjective: To evaluate the fatigue failure load, number of cycles until failure and survival probability of partially (PSZ) and fully-stabilized (FSZ) polycrystalline zirconia disc shaped specimens with different thicknesses adhesively cemented onto foundations with distinct elastic moduli. Methods: Disc-shaped specimens (n = 15, Ø = 10 mm; thickness = 1.0 and 0.7 mm) of CAD/CAM PSZ and FSZ blocks were adhesively cemented onto discs with different foundations (Ø = 10 mm; thickness = 2.0 mm) made from epoxy resin, composite resin or Ni–Cr metallic alloy. The cemented assemblies were subjected to fatigue testing using a step-stress approach (600−2800 N; step-size of 100 N; 10,000 cycles per step; 20 Hz) and the data was submitted to specific statistical tests (α = 0.05). Fractography and finite element (FEA) analyzes were also performed. Results: PSZ and FSZ presented higher fatigue failure load, number of cycles until failure and survival probabilities when cemented onto metallic alloy. All PSZ specimens survived the fatigue test when cemented onto Ni–Cr alloy (100% probability of survival at 2800 N; 230,000 cycles). Regardless of the foundation type, PSZ had better fatigue behavior than FSZ. For thickness, thinner PSZ restorations underperformed when bonded to softer foundations, while FSZ groups and groups bonded to metallic foundations had no statistical difference. Significance: The foundation material strongly influences the fatigue performance of PSZ and FSZ restorations, which presented mechanical behavior improvements when bonded to a metallic foundation. PSZ restorations showed better fatigue behavior than FSZ, while the ceramic thickness only influenced PSZ restorations bonded to softer foundations.

AB - © 2021 The Academy of Dental MaterialsObjective: To evaluate the fatigue failure load, number of cycles until failure and survival probability of partially (PSZ) and fully-stabilized (FSZ) polycrystalline zirconia disc shaped specimens with different thicknesses adhesively cemented onto foundations with distinct elastic moduli. Methods: Disc-shaped specimens (n = 15, Ø = 10 mm; thickness = 1.0 and 0.7 mm) of CAD/CAM PSZ and FSZ blocks were adhesively cemented onto discs with different foundations (Ø = 10 mm; thickness = 2.0 mm) made from epoxy resin, composite resin or Ni–Cr metallic alloy. The cemented assemblies were subjected to fatigue testing using a step-stress approach (600−2800 N; step-size of 100 N; 10,000 cycles per step; 20 Hz) and the data was submitted to specific statistical tests (α = 0.05). Fractography and finite element (FEA) analyzes were also performed. Results: PSZ and FSZ presented higher fatigue failure load, number of cycles until failure and survival probabilities when cemented onto metallic alloy. All PSZ specimens survived the fatigue test when cemented onto Ni–Cr alloy (100% probability of survival at 2800 N; 230,000 cycles). Regardless of the foundation type, PSZ had better fatigue behavior than FSZ. For thickness, thinner PSZ restorations underperformed when bonded to softer foundations, while FSZ groups and groups bonded to metallic foundations had no statistical difference. Significance: The foundation material strongly influences the fatigue performance of PSZ and FSZ restorations, which presented mechanical behavior improvements when bonded to a metallic foundation. PSZ restorations showed better fatigue behavior than FSZ, while the ceramic thickness only influenced PSZ restorations bonded to softer foundations.

U2 - 10.1016/j.dental.2021.01.001

DO - 10.1016/j.dental.2021.01.001

M3 - Article

SN - 0109-5641

VL - 37

SP - 568

EP - 577

JO - Dental Materials

JF - Dental Materials

IS - 4

ER -

Fatigue resistance of simplified CAD–CAM restorations: Foundation material and ceramic thickness effects on the fatigue behavior of partially- and fully-stabilized zirconia

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