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CAD-CAM milled versus pressed lithium-disilicate monolithic crowns adhesively cemented after distinct surface treatments: Fatigue performance and ceramic surface characteristics.
J Mech Behav Biomed Mater. 2019 06; 94:144-154.JM

Abstract

To evaluate the fatigue failure load (FFL), number of cycles for failure (CFF) and survival probabilities of lithium-disilicate (LD) monolithic crowns manufactured by two processing techniques (pressing vs. CAD/CAM) adhesively cemented to a dentin-analogue material, considering two surface treatments (conventional vs. simplified). Surface characteristics (topography, roughness and fractal dimensions) were also assessed. Forty (40) monolithic crowns were manufactured considering two specific processing techniques for each ceramic system: LDCAD - CAD/CAM lithium-disilicate (IPS e.max CAD, Ivoclar Vivadent); LDPRESS - pressed lithium-disilicate (IPS e.max Press, Ivoclar Vivadent). The crowns were adhesively cemented (Multilink Automix System, Ivoclar Vivadent) onto dentin analogue preparations considering two distinct protocols of surface treatments (conventional - hydrofluoric acid etching + silane application [HF+Sil] or simplified - etching with one-step primer (Monobond Etch&Prime, Ivoclar Vivadent) [EP]). The cemented assembly was stored in distilled water at 37 °C for 3 days and fatigue tests were run (step-stress approach: load ranging from 400 to 2000 N, step-size of 100 N, 15,000 cycles/step, 20 Hz). Fractography, surface topography, roughness, and fractal dimension analyses were performed. LDPRESS[EP] group depicted higher FFL, CFF and survival probabilities in comparison to LDCAD groups, regardless of the conditioning method. A tendency of higher Weibull modulus (mechanical reliability) was observed when using [EP] for both LDPRESS and LDCAD. SEM and AFM analysis showed very distinct initial surface patterns for the distinct processing techniques considered (LDCAD with higher fractal dimension and lower roughness than LDPRESS), and both surface treatments distinctly affected these surface characteristics. All failures were radial cracks originating at the ceramic-cement interface. Pressed lithium-disilicate monolithic crowns showed better fatigue performance in comparison to CAD/CAM milled crowns, especially when they were treated with self-etching ceramic primer. The surface treatment with self-etching primer led to similar fatigue performance when compared to hydrofluoric acid plus silane application for the same processing technique, but it tended to provide higher mechanical reliability.

Authors+Show Affiliations

MSciD Graduate Program, School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Rio Grande do Sul State, Brazil. Electronic address: ricoschestat@gmail.com.MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: camila-svs@hotmail.com.MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: andressa.venturini@hotmail.com.Department of Physics, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: thiago.burgo@ufsm.br.MSciD Graduate Program, School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Rio Grande do Sul State, Brazil. Electronic address: atais.bacchi@imed.edu.br.MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: valandrolf@gmail.com.MSciD Graduate Program, School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Rio Grande do Sul State, Brazil. Electronic address: gabriel.pereira@imed.edu.br.

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

30897502

Citation

Schestatsky, Ricardo, et al. "CAD-CAM Milled Versus Pressed Lithium-disilicate Monolithic Crowns Adhesively Cemented After Distinct Surface Treatments: Fatigue Performance and Ceramic Surface Characteristics." Journal of the Mechanical Behavior of Biomedical Materials, vol. 94, 2019, pp. 144-154.
Schestatsky R, Zucuni CP, Venturini AB, et al. CAD-CAM milled versus pressed lithium-disilicate monolithic crowns adhesively cemented after distinct surface treatments: Fatigue performance and ceramic surface characteristics. J Mech Behav Biomed Mater. 2019;94:144-154.
Schestatsky, R., Zucuni, C. P., Venturini, A. B., de Lima Burgo, T. A., Bacchi, A., Valandro, L. F., & Rocha Pereira, G. K. (2019). CAD-CAM milled versus pressed lithium-disilicate monolithic crowns adhesively cemented after distinct surface treatments: Fatigue performance and ceramic surface characteristics. Journal of the Mechanical Behavior of Biomedical Materials, 94, 144-154. https://doi.org/10.1016/j.jmbbm.2019.03.005
Schestatsky R, et al. CAD-CAM Milled Versus Pressed Lithium-disilicate Monolithic Crowns Adhesively Cemented After Distinct Surface Treatments: Fatigue Performance and Ceramic Surface Characteristics. J Mech Behav Biomed Mater. 2019;94:144-154. PubMed PMID: 30897502.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - CAD-CAM milled versus pressed lithium-disilicate monolithic crowns adhesively cemented after distinct surface treatments: Fatigue performance and ceramic surface characteristics. AU - Schestatsky,Ricardo, AU - Zucuni,Camila Pauleski, AU - Venturini,Andressa Borin, AU - de Lima Burgo,Thiago Augusto, AU - Bacchi,Atais, AU - Valandro,Luiz Felipe, AU - Rocha Pereira,Gabriel Kalil, Y1 - 2019/03/09/ PY - 2019/02/03/received PY - 2019/03/07/revised PY - 2019/03/08/accepted PY - 2019/3/22/pubmed PY - 2020/8/29/medline PY - 2019/3/22/entrez KW - Adhesion KW - Glass ceramics KW - Step-stress test KW - Surface treatment KW - Survival probability SP - 144 EP - 154 JF - Journal of the mechanical behavior of biomedical materials JO - J Mech Behav Biomed Mater VL - 94 N2 - To evaluate the fatigue failure load (FFL), number of cycles for failure (CFF) and survival probabilities of lithium-disilicate (LD) monolithic crowns manufactured by two processing techniques (pressing vs. CAD/CAM) adhesively cemented to a dentin-analogue material, considering two surface treatments (conventional vs. simplified). Surface characteristics (topography, roughness and fractal dimensions) were also assessed. Forty (40) monolithic crowns were manufactured considering two specific processing techniques for each ceramic system: LDCAD - CAD/CAM lithium-disilicate (IPS e.max CAD, Ivoclar Vivadent); LDPRESS - pressed lithium-disilicate (IPS e.max Press, Ivoclar Vivadent). The crowns were adhesively cemented (Multilink Automix System, Ivoclar Vivadent) onto dentin analogue preparations considering two distinct protocols of surface treatments (conventional - hydrofluoric acid etching + silane application [HF+Sil] or simplified - etching with one-step primer (Monobond Etch&Prime, Ivoclar Vivadent) [EP]). The cemented assembly was stored in distilled water at 37 °C for 3 days and fatigue tests were run (step-stress approach: load ranging from 400 to 2000 N, step-size of 100 N, 15,000 cycles/step, 20 Hz). Fractography, surface topography, roughness, and fractal dimension analyses were performed. LDPRESS[EP] group depicted higher FFL, CFF and survival probabilities in comparison to LDCAD groups, regardless of the conditioning method. A tendency of higher Weibull modulus (mechanical reliability) was observed when using [EP] for both LDPRESS and LDCAD. SEM and AFM analysis showed very distinct initial surface patterns for the distinct processing techniques considered (LDCAD with higher fractal dimension and lower roughness than LDPRESS), and both surface treatments distinctly affected these surface characteristics. All failures were radial cracks originating at the ceramic-cement interface. Pressed lithium-disilicate monolithic crowns showed better fatigue performance in comparison to CAD/CAM milled crowns, especially when they were treated with self-etching ceramic primer. The surface treatment with self-etching primer led to similar fatigue performance when compared to hydrofluoric acid plus silane application for the same processing technique, but it tended to provide higher mechanical reliability. SN - 1878-0180 UR - https://www.unboundmedicine.com/medline/citation/30897502/CAD_CAM_milled_versus_pressed_lithium_disilicate_monolithic_crowns_adhesively_cemented_after_distinct_surface_treatments:_Fatigue_performance_and_ceramic_surface_characteristics_ DB - PRIME DP - Unbound Medicine ER -