Fatigue properties of removable partial denture clasps fabricated by selective laser melting followed by heat treatment

Kittikundecha, Nuttaphon; Kajima, Yuka; Takaichi, Atsushi; Cho, Hla Htoot Wai; Htat, Hein Linn; Doi, Hisashi; Takahashi, Hidekazu; Hanawa, Takao; Wakabayashi, Noriyuki

doi:10.1016/j.jmbbm.2019.06.010

Cited by 25 publications

(16 citation statements)

References 37 publications

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“…Samples built at 0° and 45° had lower fatigue strength than the cast samples, but the samples manufactured at 90° have the highest fatigue strength. These properties can be affected by anisotropic microstructure, crystal orientation, surface roughness and residual stress [ 43 , 45 ]. The fatigue strength of metal AM parts can be improved through post-heat treatment [ 5 ].…”

Section: Fabrication Processmentioning

confidence: 99%

“…The fatigue strength of SLM samples was improved after heat treatment at 1150 °C [ 63 ]. However, in one study, controls with 90° building angulations exhibited longer fatigue life than the heat-treated groups [ 45 ]. It was explained due to fine cellular or columnar dendritic structures which have a function as obstacles for the dislocation motion.…”

Section: Post-processing Strategiesmentioning

confidence: 99%

“…It was explained due to fine cellular or columnar dendritic structures which have a function as obstacles for the dislocation motion. Samples with 0° and 45° building angulations showed a lower fatigue life than the heat-treated groups due to the occurrence of molten pool boundaries and Schmid factor [ 45 ]. Extended heat treatment (six hours) resulted in large precipitates (large blocky carbides formed at the grain boundaries) and a thick oxide layer which decreased fatigue strength [ 45 ].…”

Section: Post-processing Strategiesmentioning

confidence: 99%

“…Samples with 0° and 45° building angulations showed a lower fatigue life than the heat-treated groups due to the occurrence of molten pool boundaries and Schmid factor [ 45 ]. Extended heat treatment (six hours) resulted in large precipitates (large blocky carbides formed at the grain boundaries) and a thick oxide layer which decreased fatigue strength [ 45 ]. The optimization of the heat-treatment conditions for improving the mechanical properties remains a major challenge in SLM.…”

Section: Post-processing Strategiesmentioning

confidence: 99%

“…Six hours heat treatment created large precipitates and a thick oxide layer associated with a decrease in fatigue strength. [45,63] It was shown that the heat treatment up to 1050 • C for six hours was insufficient to eliminate anisotropy and residual stress. However, the dendritic structures and number of sub-grains decreased while increasing the heat-treatment temperature (from 750 • C to 1050 • C) compared with the as-built samples [60].…”

Section: Stress Relievingmentioning

confidence: 99%

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Challenges of Co–Cr Alloy Additive Manufacturing Methods in Dentistry—The Current State of Knowledge (Systematic Review)

et al. 2020

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Complex dental components which are individually tailored to the patient can be obtained due to new additive manufacturing technology. This paper reviews the metallic powders used in dental applications, the fabrication process (build orientation, process parameters) and post-processing processes (stress relieving, surface finishing). A review of the literature was performed using PubMed, ScienceDirect, Mendeley and Google Scholar. Over eighty articles were selected based on relevance to this review. This paper attempts to include the latest research from 2010 until 2020, however, older manuscripts (10 articles) were also selected. Over 1200 records were identified through the search; these were screened for title and/or summary. Over eighty articles were selected based on relevance to this review. In order to obtain a product which can be used in clinical applications, the appropriate manufacturing parameters should be selected. A discussion was made on optimal selective laser melting (SLM) parameters in dentistry. In addition, this paper includes a critical review of applied thermal treatment methods for Co–Cr alloys used in dentistry.

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Section: Fabrication Processmentioning

confidence: 99%

Section: Post-processing Strategiesmentioning

confidence: 99%