How do different intraoral scanners and milling machines affect the fit and fatigue behavior of lithium disilicate and resin composite endocrowns?

Rafaela Oliveira Pilecco; Lucas Saldanha da Rosa; Andrea Baldi; Renan Vaz Machry; João Paulo Mendes Tribst; Luiz Felipe Valandro; Cornelis Johannes Kleverlaan; Nicola Scotti; Gabriel Kalil Rocha Pereira

doi:10.1016/j.jmbbm.2024.106557

How do different intraoral scanners and milling machines affect the fit and fatigue behavior of lithium disilicate and resin composite endocrowns?

Rafaela Oliveira Pilecco
, Lucas Saldanha da Rosa
, Andrea Baldi
, Renan Vaz Machry
, João Paulo Mendes Tribst^*
, Luiz Felipe Valandro
, Cornelis Johannes Kleverlaan
, Nicola Scotti
, Gabriel Kalil Rocha Pereira

^*Corresponding author for this work

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

Abstract

The aim of this in vitro study was to evaluate the effect of the combinations of two different intraoral scanners (IOS), two milling machines, and two restorative materials on the marginal/internal fit and fatigue behavior of endocrowns produced by CAD-CAM. Eight groups (n= 10) were considered through the combination of TRIOS 3 (TR) or Primescan (PS) IOS; 4-axes (CR; CEREC MC XL) or 5-axes (PM; PrograMill PM7) milling machines; and lithium disilicate (LD; IPS e.max CAD) or resin composite (RC; Tetric CAD) restorative materials. Specific surface treatments were applied to each material, and the bonding to its corresponding Endocrown-shaped fiberglass-reinforced epoxy resin preparations was performed (Variolink Esthetic DC). Computed microtomography (μCT) was performed to assess the marginal/internal fit, as well as a mechanical fatigue test (20 Hz, initial load = 100 N/5000 cycles; step-size = 50 N/10,000 cycles until a threshold of 1500 N, then, the step-size was increased if needed to 100 N/10,000 cycles until failure or a threshold of 2800 N) to evaluate the restorations long-term behavior. Complementary analysis of the fracture features and surface topography in scanning electron microscopy was performed. Three-way ANOVA and Kaplan-Meier test (α = 0.05) were performed for marginal/internal fit, and fatigue behavior data, respectively. PS scanner, CR milling machine, and RC endocrowns resulted in a better marginal fit compared to their counterparts. Still, the PM machine resulted in a better pulpal space fit compared to the CR milling machine. Regardless of the scanner and milling machine, RC endocrowns exhibited superior fatigue behavior than LD ones. LD endocrowns presented margin chipping regardless of the milling machine used. Despite minor differences in terms of fit, the ‘IOS’ and ‘milling machine’ factors did not impair the fatigue behavior of endocrowns. Resin-composite restorations resulted in a higher survival rate compared to glass-ceramic ones, independently of the digital devices used in the workflow.

Original language	English
Article number	106557
Pages (from-to)	1-10
Number of pages	10
Journal	Journal of the Mechanical Behavior of Biomedical Materials
Volume	155
Early online date	18 Apr 2024
DOIs	https://doi.org/10.1016/j.jmbbm.2024.106557
Publication status	Published - Jul 2024

Bibliographical note

Publisher Copyright:
© 2024 The Author(s)

Funding

This work is part of the fulfillment of the requirements of the Ph.D. degree (R.O.P.) in the Post-Graduate Program in Oral Sciences at the Faculty of Dentistry, Universidade Federal de Santa Maria (Rio Grande do Sul State, Brazil). Besides, this study was partially financed by the Brazilian National Council for Scientific and Technological Development \u2013 CNPq (R.O.P. doctorate scholarship, project #140118/2022-5; R.V.M. Postdoctoral Scholarship; Project no. 151004/2022-6; G.K.R.P. research productivity scholarship Pq2, process number #304665/2022-3), by the Brazilian Federal Agency for Coordination of Improvement of Higher Education Personnel \u2013 CAPES (Finance code 001, L.S.R. Doctorate's scholarship), and by the Foundation to Research Support of the Rio Grande do Sul State \u2013 FAPERGS (project #21/2551-0001961-1). This work is part of the fulfillment of the requirements of the Ph.D. degree (R.O.P.) in the Post-Graduate Program in Oral Sciences at the Faculty of Dentistry, Universidade Federal de Santa Maria (Rio Grande do Sul State, Brazil). Besides, this study was partially financed by the Brazilian National Council for Scientific and Technological Development \u2013 CNPq (R.O.P. doctorate scholarship, project #140118/2022-5; R.V.M. Postdoctoral Scholarship; Project no. 151004/2022-6; G.K.R.P. research productivity scholarship Pq2, process number #304665/2022-3), by the Brazilian Federal Agency for Coordination of Improvement of Higher Education Personnel \u2013 CAPES (Finance code 001, L.S.R. Doctorate\u2019s scholarship), and by the Foundation to Research Support of the Rio Grande do Sul State \u2013 FAPERGS (project #21/2551-0001961-1).

Funders	Funder number
Universidade Federal de Santa Maria
Brazilian Federal Agency for Coordination of Improvement of Higher Education Personnel
Rio Grande do Sul State
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Conselho Nacional de Desenvolvimento Científico e Tecnológico	140118/2022-5, 151004/2022-6, 304665/2022-3
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul	21/2551-0001961-1
Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul

Keywords

CAD/CAM
Dental ceramics
Fatigue
Intraoral scanners
Marginal/internal fit
Milling machine

Access to Document

10.1016/j.jmbbm.2024.106557

Persistent URL (handle)

Persistent link

Cite this

Pilecco, R. O., da Rosa, L. S., Baldi, A., Machry, R. V., Tribst, J. P. M., Valandro, L. F., Kleverlaan, C. J., Scotti, N., & Pereira, G. K. R. (2024). How do different intraoral scanners and milling machines affect the fit and fatigue behavior of lithium disilicate and resin composite endocrowns? Journal of the Mechanical Behavior of Biomedical Materials, 155, 1-10. Article 106557. https://doi.org/10.1016/j.jmbbm.2024.106557

@article{c3f2117a64ee4dc7936c43d68e70ae94,

title = "How do different intraoral scanners and milling machines affect the fit and fatigue behavior of lithium disilicate and resin composite endocrowns?",

abstract = "The aim of this in vitro study was to evaluate the effect of the combinations of two different intraoral scanners (IOS), two milling machines, and two restorative materials on the marginal/internal fit and fatigue behavior of endocrowns produced by CAD-CAM. Eight groups (n= 10) were considered through the combination of TRIOS 3 (TR) or Primescan (PS) IOS; 4-axes (CR; CEREC MC XL) or 5-axes (PM; PrograMill PM7) milling machines; and lithium disilicate (LD; IPS e.max CAD) or resin composite (RC; Tetric CAD) restorative materials. Specific surface treatments were applied to each material, and the bonding to its corresponding Endocrown-shaped fiberglass-reinforced epoxy resin preparations was performed (Variolink Esthetic DC). Computed microtomography (μCT) was performed to assess the marginal/internal fit, as well as a mechanical fatigue test (20 Hz, initial load = 100 N/5000 cycles; step-size = 50 N/10,000 cycles until a threshold of 1500 N, then, the step-size was increased if needed to 100 N/10,000 cycles until failure or a threshold of 2800 N) to evaluate the restorations long-term behavior. Complementary analysis of the fracture features and surface topography in scanning electron microscopy was performed. Three-way ANOVA and Kaplan-Meier test (α = 0.05) were performed for marginal/internal fit, and fatigue behavior data, respectively. PS scanner, CR milling machine, and RC endocrowns resulted in a better marginal fit compared to their counterparts. Still, the PM machine resulted in a better pulpal space fit compared to the CR milling machine. Regardless of the scanner and milling machine, RC endocrowns exhibited superior fatigue behavior than LD ones. LD endocrowns presented margin chipping regardless of the milling machine used. Despite minor differences in terms of fit, the {\textquoteleft}IOS{\textquoteright} and {\textquoteleft}milling machine{\textquoteright} factors did not impair the fatigue behavior of endocrowns. Resin-composite restorations resulted in a higher survival rate compared to glass-ceramic ones, independently of the digital devices used in the workflow.",

keywords = "CAD/CAM, Dental ceramics, Fatigue, Intraoral scanners, Marginal/internal fit, Milling machine",

author = "Pilecco, \{Rafaela Oliveira\} and \{da Rosa\}, \{Lucas Saldanha\} and Andrea Baldi and Machry, \{Renan Vaz\} and Tribst, \{Jo{\~a}o Paulo Mendes\} and Valandro, \{Luiz Felipe\} and Kleverlaan, \{Cornelis Johannes\} and Nicola Scotti and Pereira, \{Gabriel Kalil Rocha\}",

note = "Publisher Copyright: {\textcopyright} 2024 The Author(s)",

year = "2024",

month = jul,

doi = "10.1016/j.jmbbm.2024.106557",

language = "English",

volume = "155",

pages = "1--10",

journal = "Journal of the Mechanical Behavior of Biomedical Materials",

issn = "1751-6161",

publisher = "Elsevier Ltd",

}