Relating Type of Mold Materials to Crystal Morphology and Properties of Glass-ceramics with YSZ Additions as a Dental Material
Sukanda Angkulpipat, Thapanee Srichumpong, Sahadsaya Prasertwong, Ekarat Meechoowas, Krongkarn Sirinukunwattana, Greg Heness, Roberto Rosa, Kallaya Suputtamongkol and Duangrudee Chaysuwan** Author for corresponding; e-mail address: fengddc@ku.ac.th
Volume: Vol.47 No.6 (November 2020)
Research Article
DOI:
Received: 25 March 2020, Revised: -, Accepted: 29 June 2020, Published: -
Citation: Angkulpipat S., Srichumpong T., Prasertwong S., Meechoowas E., Sirinukunwattana K., Heness G., et al., Relating Type of Mold Materials to Crystal Morphology and Properties of Glass-ceramics with YSZ Additions as a Dental Material, Chiang Mai Journal of Science, 2020; 47(6): 1283-1296.
Abstract
YSZ was added to glass frit in order to improve properties of the glass-ceramic dental materials by casting into a graphite mold and a cast iron mold and then crystallized via heat treatment. XRD results presented the similar crystalline phases of phlogopite-calcium mica and tetragonal zirconia in both molds. Microstructures by SEM showed the different crystal morphology due to casting molds. The slow cooling of graphite mold produced the equiaxed crystals whereas the fast cooling of cast iron mold promoted rod-like, and YSZ addition increased the number of crystals. The properties depended on the crystal morphology and crystallinity. The 5 wt% YSZ added glass-ceramic from graphite mold developed the equiaxed crystals to present the desirable properties of 147.15 MPa, flexural strength, 251.80 μg/cm2, chemical solubility and 9.26 × 10-6/°C CTE. The results were accepted by ISO 6872:2015 (Dentistry-Ceramic Materials) in type II class 2b as a partially and fully covered single substructure and matched with commercial porcelains.