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

Authors
 So-Hyun Kim  ;  Nam-Sik Oh  ;  Nan-Sim Pang  ;  Bock-Young Jung 
Citation
 JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, Vol.148 : 106167, 2023-12 
Journal Title
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
ISSN
 1751-6161 
Issue Date
2023-12
MeSH
Ceramics ; Dental Materials ; Flexural Strength* ; Materials Testing ; Surface Properties ; Temperature ; Yttrium / chemistry ; Zirconium* / chemistry
Keywords
Additive manufacturing ; Air-abrasion ; Biaxial flexural strength ; Hydrofluoric acid etching ; Low-temperature degradation ; Zirconia
Abstract
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. © 2023 The Authors
Files in This Item:
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DOI
10.1016/j.jmbbm.2023.106167
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Advanced General Dentistry (통합치의학과) > 1. Journal Papers
Yonsei Authors
Pang, Nan Sim(방난심) ORCID logo https://orcid.org/0000-0003-4265-673X
Jung, Bok Yeong(정복영) ORCID logo https://orcid.org/0000-0002-8186-2109
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/198011
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