Taipei Medical University Institutional Repository:Item 987654321/58995
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    Please use this identifier to cite or link to this item: http://libir.tmu.edu.tw/handle/987654321/58995


    Title: 比較傳統鑄造與數位化製作局部活動義齒牙架的顯微結構與機械性質
    Comparative study of microstructure and mechanical properties for casting and digital fabricating removable partial denture framework
    Authors: 許靖瑩
    Hsu, Ching-Ying
    Contributors: 牙體技術學系碩士班
    彭珮雯
    黃瓊芳
    Keywords: 鈷鉻合金;雷射熔融積層技術;局部活動義齒牙架;熱處理
    Co-Cr alloys;selective laser melting;removal partial denture frameworks;heat treatment
    Date: 2019-07-12
    Issue Date: 2020-05-08 14:50:55 (UTC+8)
    Abstract: Purpose. The objective of the present study was to investigate the microstructures and mechanical properties of Co-Cr alloys using selective laser melting (SLM) and heat treatment to assess their potential use in removal partial denture (RPD) frameworks .
    Material and Method. Three groups of dumbbell and framework specimens made of Co-Cr alloys were prepared using casting (CAST), selective laser melting (SLM) and SLM followed by the heat treatment (SLM+H). The microstructures of the specimens were evaluated using
    optical microscopy (OM), scanning electron microscope (SEM), and X-ray diffractometer (XRD). The mechanical properties were evaluated using a tensile test according to ISO 22674.
    The retentive force and fatigue resistance were analyzed using the insertion/removal test. Data were statistically analyzed using two-way ANOVA and Tukey’s multiple comparison test.
    Results. The results from OM and SEM showed that the microstructural was strongly influenced by different fabricated procedures. The typical dendritic grains predominated in the CAST group. The SLM and SLM+H groups exhibited clearly laser scan traces and revealed the
    presence of fine grains. The mechanical properties of all groups satisfied the type 5 criteria in
    ISO 22674 (0.2% yield strength (YS): >500 MPa). The SLM group showed the highest ultimate tensile strength (UTS) and 0.2 % YS followed by the SLM+H and CAST groups. The percent elongation value was higher in the SLM+H and SLM groups than the CAST group. It was suggested that a proper heat treatment was an efficient strategy for improving the mechanical properties of SLM Co-Cr alloys that showed acceptable tensile ductility. The retentive force and fatigue resistance showed SLM+H groups the smallest change rates.
    Conclusion. The SLM and SLM+H group showed superior mechanical properties to the CAST groups. Overall, the SLM+H groups was suitable for framework, considering the
    toughness of dental prostheses.
    Description: 碩士
    指導教授：彭珮雯
    共同指導教授：黃瓊芳
    委員：李薇芳
    委員：楊自森
    委員：歐士輔
    Data Type: thesis
    Appears in Collections:[School of Dental Technology] Dissertations/Theses

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