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An Assessment of Slow Crack Growth in Leucite-Reinforced Ceramics

Chatriyanuyoke, Pakawat
http://rave.ohiolink.edu/etdc/view?acc_num=osu1243350756

Abstract Details

2009, Master of Science, Ohio State University, Dentistry.
Purpose: To assess the slow crack growth parameters of a leucite-reinforced dental ceramic under constant stress rate condition and determine the influence of the environment and surface finish on the resulting parameters. Materials & methods: 130 ceramic plates (Pro-CAD, Ivoclar Vivadent, Schaan, Liechtenstein) of 0.7 mm thick were prepared and one surface finished with 600 grit SiC slurry. Ten specimens were used to evaluate the inert strength and serve as the control group (Control). The remaining specimens were arbitrarily divided into 3 groups: In air @ ambient temperature (SCA), in water @ ambient temperature (SCW), and etched tensile surface in air @ambient temperature (HFA). All specimens were tested under constant stress-rate biaxial flexural strength in a manner similar to that described in ASTM C 1368. The specimens from each of the 3 experimental group were tested at four different cross head speed of: 0.01, 0.05, 0.1, and 1 mm/min, respectively using a displacement controlled universal testing machine. The inert group was tested in silicone oil at 1 mm/min. The flexural strength and stress rate were determined for each speciman and the SCG parameters n and D were calculated for each of the experimental groups. Results: The resulting SCG parameters for each experimental group were n = 38.19 and D = 143.34 for group SCA, n = -59.32 and D = 145.97 for group SCW, and n = 40.21 and D = 148.65 for group HFA. Group SCW showed the lowest resistance to stress corrosion (n = -59.32) compared to the other groups. The inert strength of the leucite ceramic resulted in the highest mean strength 180.4 MPa. Conclusions: There is no different in SCG parameter (n) from constant stress-rate test between group SCA and HFA for the ProCAD material tested. ProCAD more susceptible to subcritical crack growth when compared to ambient air.
Robert Seghi, DDS, MS (Advisor)
Noriko Katsube, PhD (Committee Member)
Lisa Knobloch, DDS, MS (Committee Member)
39 p.
Dental Care; Materials Science
Slow Crack Growth; Ceramics; Leucite

Recommended Citations

Citations

  • Chatriyanuyoke, P. (2009). An Assessment of Slow Crack Growth in Leucite-Reinforced Ceramics [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243350756

    APA Style (7th edition)

  • Chatriyanuyoke, Pakawat. An Assessment of Slow Crack Growth in Leucite-Reinforced Ceramics. 2009. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1243350756.

    MLA Style (8th edition)

  • Chatriyanuyoke, Pakawat. "An Assessment of Slow Crack Growth in Leucite-Reinforced Ceramics." Master's thesis, Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243350756

    Chicago Manual of Style (17th edition)

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© 2009, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.