Fatigue performance of distinct CAD/CAM dental ceramics

L.F. Guilardi; P. Soares; A. Werner; N. de Jager; G.K.R. Pereira; C.J. Kleverlaan; M.P. Rippe; L.F. Valandro

doi:10.1016/j.jmbbm.2019.103540

Fatigue performance of distinct CAD/CAM dental ceramics

L.F. Guilardi
, P. Soares
, A. Werner
, N. de Jager
, G.K.R. Pereira
, C.J. Kleverlaan
, M.P. Rippe
, L.F. Valandro

Dental Material Sciences

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

Abstract

This study investigated the effect of surface roughness (polished vs. CAD/CAM milling roughness simulation) on the fatigue behavior of five dental ceramics for manufacturing CAD/CAM monolithic restorations. Specimens of five dental ceramics (FC- feldspathic; PICN- polymer-infiltrated ceramic-network; ZLS- zirconia-reinforced lithium silicate glass-ceramic; LD-lithium disilicate glass-ceramic; YZ-yttria-stabilized tetragonal zirconia polycrystal), to be tested under fatigue (12 × 12 × 1.2 mm³), were assigned into two groups according to surface treatment: polished ‘p’ (#2500-grit SiC papers) and CAD/CAM milling roughness simulation ‘gr’ (grinding with #60-grit SiC paper). The fatigue test was performed through the stepwise method (40N–660N; step of 20N; 10,000 cycles/step; 20 Hz frequency). Roughness, topographic and fractographic analyses were performed. The fatigue data were analyzed by Kaplan-Meier and Mantel-Cox (Log rank), and Pearson correlation was used to correlate roughness vs. fatigue data. CAD/CAM milling roughness simulation led to significantly (p < 0.05) greater roughness (Ra and Rz), promoting a more irregular topography with scratches and grooves, and led to a lower fatigue performance for all the tested ceramics. Fractographic analysis depicted the origin of failure at the higher stress concentration side, the side subjected to tensile tension during the fatigue test. The CAD/CAM milling roughness simulation significantly decreased the fatigue performance of the evaluated ceramic materials.

Original language	English
Article number	103540
Pages (from-to)	1-8
Number of pages	8
Journal	Journal of the Mechanical Behavior of Biomedical Materials
Volume	103
Early online date	15 Nov 2019
DOIs	https://doi.org/10.1016/j.jmbbm.2019.103540
Publication status	Published - Mar 2020

Funding

This work is part of the fulfillment for the requirements of the PhD degree (L.F.G.) in the Post-Graduate Program in Oral Sciences, at the Faculty of Dentistry, Federal University of Santa Maria-RS, Brazil. This study was financed partly by the Brazilian Federal Agency for Coordination of Improvement of Higher Education Personnel - CAPES (Finance Code 001), and in part by the scholarship financial support at ACTA (Academisch Centrum Tandheelkunde Amsterdam) (CAPES/NUFFIC program: NUFFIC Dutch Organization for Internationalization in Education; Project # 056/14; Process # 88881.145663/2017?01). The authors also give thanks to Dr. Catina Prochnow for technical support during specimen manufacturing and fatigue testing.

Funders	Funder number
Academisch Centrum Tandheelkunde Amsterdam	88881.145663/2017–01, 056/14
Brazilian Federal Agency for Coordination of Improvement of Higher Education Personnel
Faculty of Dentistry
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Universidade Federal de Santa Maria

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 9 Industry, Innovation, and Infrastructure

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10.1016/j.jmbbm.2019.103540

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Cite this

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title = "Fatigue performance of distinct CAD/CAM dental ceramics",

abstract = "This study investigated the effect of surface roughness (polished vs. CAD/CAM milling roughness simulation) on the fatigue behavior of five dental ceramics for manufacturing CAD/CAM monolithic restorations. Specimens of five dental ceramics (FC- feldspathic; PICN- polymer-infiltrated ceramic-network; ZLS- zirconia-reinforced lithium silicate glass-ceramic; LD-lithium disilicate glass-ceramic; YZ-yttria-stabilized tetragonal zirconia polycrystal), to be tested under fatigue (12 × 12 × 1.2 mm3), were assigned into two groups according to surface treatment: polished {\textquoteleft}p{\textquoteright} (\#2500-grit SiC papers) and CAD/CAM milling roughness simulation {\textquoteleft}gr{\textquoteright} (grinding with \#60-grit SiC paper). The fatigue test was performed through the stepwise method (40N–660N; step of 20N; 10,000 cycles/step; 20 Hz frequency). Roughness, topographic and fractographic analyses were performed. The fatigue data were analyzed by Kaplan-Meier and Mantel-Cox (Log rank), and Pearson correlation was used to correlate roughness vs. fatigue data. CAD/CAM milling roughness simulation led to significantly (p < 0.05) greater roughness (Ra and Rz), promoting a more irregular topography with scratches and grooves, and led to a lower fatigue performance for all the tested ceramics. Fractographic analysis depicted the origin of failure at the higher stress concentration side, the side subjected to tensile tension during the fatigue test. The CAD/CAM milling roughness simulation significantly decreased the fatigue performance of the evaluated ceramic materials.",

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AU - Soares, P.

AU - Werner, A.

AU - de Jager, N.

AU - Pereira, G.K.R.

AU - Kleverlaan, C.J.

AU - Rippe, M.P.

AU - Valandro, L.F.

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Fatigue performance of distinct CAD/CAM dental ceramics

Abstract

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