The effect of surface treatment and low-temperature degradation on flexural strength of additive manufactured zirconia.

Autor: Kim SH; Department of Dentistry, Inha University School of Medicine, Inha University Hospital, Incheon, South Korea. Electronic address: ksohyun3@naver.com., Oh NS; Department of Dentistry, Inha University School of Medicine, Inha University Hospital, Incheon, South Korea. Electronic address: onsdo@inha.ac.kr., Pang NS; Department of Advanced General Dentistry, Yonsei University, College of Dentistry, Seoul, South Korea. Electronic address: PANGNS@yuhs.ac., Jung BY; Department of Advanced General Dentistry, Yonsei University, College of Dentistry, Seoul, South Korea. Electronic address: JBY1004@yuhs.ac.
Jazyk: angličtina
Zdroj: Journal of the mechanical behavior of biomedical materials [J Mech Behav Biomed Mater] 2023 Dec; Vol. 148, pp. 106167. Date of Electronic Publication: 2023 Oct 09.
DOI: 10.1016/j.jmbbm.2023.106167
Abstrakt: This study aimed to assess the effect of low-temperature degradation (LTD) and surface treatment on the flexural strength of additive-manufactured (AM) zirconia by comparison to subtractive-manufactured (SM) zirconia. Disc-shaped zirconia specimens were fabricated using AM and SM technology, and each group was assigned to 3 subgroups according to the type of surface treatment: control, sandblasting (SB), and 9% hydrofluoric acid etching (HF). The groups were then further divided into 2 subgroups: unaged and aged. Biaxial flexural strength, crystal phase, surface topography, and surface roughness were measured to evaluate the mechanical properties. Statistical analyses were performed with 3-way ANOVA, followed by the comparison of means with Bonferroni post hoc analyses. The means and standard deviations of the biaxial flexural strength and Weibull parameters were calculated with descriptive statistics. All SM groups showed significantly greater flexural strength than the AM groups (p < .05), and LTD did not affect flexural strength except for the SMHF group (p < .05). After LTD, monoclinic phases (m-phase) were found in all groups, and SEM images showed grain pullout due to zirconia volume expansion in both control groups. Sandblasting significantly affected flexural strength (p < .05), whereas the HF group did not affect flexural strength except in the SMHF group after LTD (p < .05). No significant difference was observed in the surface roughness of AM compared to SM groups conditioned with the same surface treatment regardless of LTD. AM zirconia has comparable mechanical properties to SM zirconia, regardless of low-temperature degradation and surface treatment, which indicates the potential of the AM technique for clinical applications.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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