Immersion-Induced Changes in Structure and Properties of a Calcium Sulfate Cement

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  • Chen Wei-Luen
    Department of Materials Science and Engineering, National Cheng Kung University
  • Fan Nai-Yen
    Department of Materials Science and Engineering, National Cheng Kung University
  • Lee Jing-Wei
    Division of Plastic Surgery, Department of Surgery, National Cheng Kung University Hospital
  • Lin Ruey-Mo
    Department of Orthopedics, National Cheng Kung University College of Medicine and Hospital
  • Ju Chien-Ping
    Department of Materials Science and Engineering, National Cheng Kung University
  • Chern Lin Jiin-Huey
    Department of Materials Science and Engineering, National Cheng Kung University

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This research was devoted to the investigation of changes in structure and properties of a calcium sulfate hemihydrates (CSH) cement immersed in Hanks’ solution for different periods of time. XRD patterns indicated a quick phase change (a hydration process) of CSH into calcium sulfate dihydrate (CSD) after the cement powder was mixed with the setting solution. After the hardened cement was immersed in Hanks’ solution for 1 d, CSD became the dominant phase. The long-term (up to 30 d) pH value of the Hanks’ solution wherein the cement was immersed remained in the range of 6–7. The hardened cement gradually lost its weight and increased its porosity level with immersion time. When immersed for 1 d, the average compressive strength (CS) value of the cement reached its maximum value. After 30 d, the compressive strength (CS) value of the cement still remained >25 MPa. SEM showed that, after being immersed for 30 d, numerous large, faceted CSD crystals were observed throughout the sample. Cytotoxicity test indicated that the present cement is a biocompatible implant material.

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