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Newer vs. older CAD/CAM burs: Influence of bur experience on the fatigue behavior of adhesively cemented simplified lithium-disilicate glass-ceramic restorations.
J Mech Behav Biomed Mater. 2019 07; 95:172-179.JM

Abstract

This study evaluated the effect of the CAD/CAM burs experience (newer vs older as consequence of the milling sequence) on fatigue failure load (FFL), number of cycles for failure (CFF), and survival rates of lithium disilicate glass-ceramic simplified restorations adhesively cemented to a dentin analogue substrate. Three sets of CAD/CAM burs were used to mill disc-shaped ceramic specimens (1 bur set - 18 milled discs with 10 mm diameter and 1.5 mm thickness), considering the bur experience as a result of the milling sequence to compose the study groups: G1-6 - discs obtained from the 1st to 6th milling of each bur set; G7-12 - specimens from the 7th to 12th milling; G13-18 - discs from the 13th to 18th. Discs of dentin analogue (G10, 10 mm diameter and 2.0 mm thickness) were made to serve as substrate (base material) and randomly assigned into pairs with the respective ceramic discs. Then, the ceramic discs were adhesively cemented onto the dentin analogue substrate, composing a three-layer specimen that mimics a monolithic restoration of a posterior tooth. Specimens were tested under stepwise fatigue approach: frequency = 20 Hz, 5000 cycles at maximum load of 400 N to accommodate the testing assembly, followed by incremental steps of 200 N with initial load ranging from 10 to 1000 N, to a maximum of 20,000 cycles/each step, until the occurrence of failure (radial crack). FFL and CFF were recorded at the end of the testing and subjected to statistical analysis. Supplementary roughness analysis of the milled surface was performed (n = 18) using a contact profilometer. Residual stress after milling and acid etching were accessed via X-ray Diffractometry analysis. FFL and CFF were not affected by increase on bur experience (no statistical differences among groups), despite that, it affected both Ra and Rz parameters (G1-6 had the smoothest surface). The residual stress concentration was negligible (milling did not induce residual stress concentration). It is concluded that the fatigue behavior of adhesively cemented lithium-disilicate glass-ceramic restorations was not influenced by CAD/CAM bur experience (newer vs older as consequence of the milling sequence), and so the residual stress concentration induced by milling was negligible.

Authors+Show Affiliations

Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp) - Institute of Science and Technology, São José dos Campos, Brazil. Electronic address: guilherme.andrade@ict.unesp.br.Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp) - Institute of Science and Technology, São José dos Campos, Brazil. Electronic address: vandebergdiniz@gmail.com.Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp) - Institute of Science and Technology, São José dos Campos, Brazil. Electronic address: cedatte@gmail.com.School of Dentistry, Meridional Faculty-IMED, Passo Fundo, Rio Grande do Sul State, Brazil. Electronic address: gabrielkrpereira@hotmail.com.Oral Science, Prosthodontics Unit, Faculty of Odontology, Federal University of Santa Maria (UFSM), Santa Maria, Brazil. Electronic address: andressa.venturini@hotmail.com.Department of Physics, Aeronautical Technology Institute (ITA), São José Dos Campos, Brazil. Electronic address: moreiratiago22@gmail.com.Department of Dentistry (Prosthetic Dentistry), University of Taubaté (UNITAU), Taubaté, Brazil. Electronic address: marinamaral_85@yahoo.com.br.Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp) - Institute of Science and Technology, São José dos Campos, Brazil. Electronic address: mmbottino@uol.com.br.Oral Science, Prosthodontics Unit, Faculty of Odontology, Federal University of Santa Maria (UFSM), Santa Maria, Brazil. Electronic address: valandrolf@gmail.com.Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp) - Institute of Science and Technology, São José dos Campos, Brazil. Electronic address: marquesdemelo@gmail.com.

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

31009901

Citation

Schmitt de Andrade, Guilherme, et al. "Newer Vs. Older CAD/CAM Burs: Influence of Bur Experience On the Fatigue Behavior of Adhesively Cemented Simplified Lithium-disilicate Glass-ceramic Restorations." Journal of the Mechanical Behavior of Biomedical Materials, vol. 95, 2019, pp. 172-179.
Schmitt de Andrade G, Diniz V, Datte CE, et al. Newer vs. older CAD/CAM burs: Influence of bur experience on the fatigue behavior of adhesively cemented simplified lithium-disilicate glass-ceramic restorations. J Mech Behav Biomed Mater. 2019;95:172-179.
Schmitt de Andrade, G., Diniz, V., Datte, C. E., Pereira, G. K. R., Venturini, A. B., Campos, T. M. B., Amaral, M., Bottino, M. A., Valandro, L. F., & Marques de Melo, R. (2019). Newer vs. older CAD/CAM burs: Influence of bur experience on the fatigue behavior of adhesively cemented simplified lithium-disilicate glass-ceramic restorations. Journal of the Mechanical Behavior of Biomedical Materials, 95, 172-179. https://doi.org/10.1016/j.jmbbm.2019.04.002
Schmitt de Andrade G, et al. Newer Vs. Older CAD/CAM Burs: Influence of Bur Experience On the Fatigue Behavior of Adhesively Cemented Simplified Lithium-disilicate Glass-ceramic Restorations. J Mech Behav Biomed Mater. 2019;95:172-179. PubMed PMID: 31009901.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Newer vs. older CAD/CAM burs: Influence of bur experience on the fatigue behavior of adhesively cemented simplified lithium-disilicate glass-ceramic restorations. AU - Schmitt de Andrade,Guilherme, AU - Diniz,Vandeberg, AU - Datte,Carlos Eduardo, AU - Pereira,Gabriel Kalil Rocha, AU - Venturini,Andressa Borin, AU - Campos,Tiago Moreira Bastos, AU - Amaral,Marina, AU - Bottino,Marco Antonio, AU - Valandro,Luiz Felipe, AU - Marques de Melo,Renata, Y1 - 2019/04/09/ PY - 2019/02/20/received PY - 2019/04/02/revised PY - 2019/04/05/accepted PY - 2019/4/23/pubmed PY - 2020/9/10/medline PY - 2019/4/23/entrez KW - All-ceramic KW - Cementation KW - Fatigue KW - Machining KW - Radial crack KW - Roughness SP - 172 EP - 179 JF - Journal of the mechanical behavior of biomedical materials JO - J Mech Behav Biomed Mater VL - 95 N2 - This study evaluated the effect of the CAD/CAM burs experience (newer vs older as consequence of the milling sequence) on fatigue failure load (FFL), number of cycles for failure (CFF), and survival rates of lithium disilicate glass-ceramic simplified restorations adhesively cemented to a dentin analogue substrate. Three sets of CAD/CAM burs were used to mill disc-shaped ceramic specimens (1 bur set - 18 milled discs with 10 mm diameter and 1.5 mm thickness), considering the bur experience as a result of the milling sequence to compose the study groups: G1-6 - discs obtained from the 1st to 6th milling of each bur set; G7-12 - specimens from the 7th to 12th milling; G13-18 - discs from the 13th to 18th. Discs of dentin analogue (G10, 10 mm diameter and 2.0 mm thickness) were made to serve as substrate (base material) and randomly assigned into pairs with the respective ceramic discs. Then, the ceramic discs were adhesively cemented onto the dentin analogue substrate, composing a three-layer specimen that mimics a monolithic restoration of a posterior tooth. Specimens were tested under stepwise fatigue approach: frequency = 20 Hz, 5000 cycles at maximum load of 400 N to accommodate the testing assembly, followed by incremental steps of 200 N with initial load ranging from 10 to 1000 N, to a maximum of 20,000 cycles/each step, until the occurrence of failure (radial crack). FFL and CFF were recorded at the end of the testing and subjected to statistical analysis. Supplementary roughness analysis of the milled surface was performed (n = 18) using a contact profilometer. Residual stress after milling and acid etching were accessed via X-ray Diffractometry analysis. FFL and CFF were not affected by increase on bur experience (no statistical differences among groups), despite that, it affected both Ra and Rz parameters (G1-6 had the smoothest surface). The residual stress concentration was negligible (milling did not induce residual stress concentration). It is concluded that the fatigue behavior of adhesively cemented lithium-disilicate glass-ceramic restorations was not influenced by CAD/CAM bur experience (newer vs older as consequence of the milling sequence), and so the residual stress concentration induced by milling was negligible. SN - 1878-0180 UR - https://www.unboundmedicine.com/medline/citation/31009901/Newer_vs__older_CAD/CAM_burs:_Influence_of_bur_experience_on_the_fatigue_behavior_of_adhesively_cemented_simplified_lithium_disilicate_glass_ceramic_restorations_ DB - PRIME DP - Unbound Medicine ER -