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Afnan Kashkari MS Thesis.pdf (54.48 MB)

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Comparison of Load-to-Fracture Values and Fracture Characterization of Monolithic Zirconia, Lithium Disilicate, and Zirconia-Reinforced Lithium Silicate Glass-Ceramic CAD/CAM Crowns

Kashkari, Afnan
http://rave.ohiolink.edu/etdc/view?acc_num=osu1469039766

Abstract Details

2016, Master of Science, Ohio State University, Dentistry.
All-ceramic monolithic crowns have been extensively used in prosthodontics in recent years for their excellent advantages compared to traditional metal-based restorations. In the oral environment, ceramic restorations are susceptible to cyclic fatigue failure, mainly due to the presence of cyclic masticatory forces together with the moist environment. The purpose of the study was to compare the integrity of zirconia, lithium disilicate, and zirconia-reinforced lithium silicate monolithic CAD/CAM crowns after being subjected to cyclic loading in a wet condition and then subjected to static loading until fracture. A fiberglass master die replica was used to fabricate (1) zirconia (Zirkonzahn, South Tyrol, Italy), (2) lithium disilicate (LDS, IPS e.max® CAD, Ivoclar Vivadent AG, Schaan / Liechtenstein), and (3) zirconia-reinforced lithium silicate glass ceramic (ZLS), Vita suprinity, VITA Zahnfabrik, Bad Sackingen, Germany) monolithic crowns that were milled using CAD/CAM technology. The crowns were bonded according to manufacturer instructions and subjected to cyclic loading (10,000 and 50,000 cycles) under wet conditions. Representative specimens from each group were examined using SEM. Analysis of the recorded load-to-fracture values was carried out with two-way (ANOVA) followed by the Tukey-Kramer post hoc test (a=.05). The mean of load-to-fracture values measured were 3232.27 N for 10,000-cycle LDS, 3510.62 N for 50,000-cycle LDS, 1207.69 N for 10,000-cycle ZLS, 761.20 N for 50,000-cycle ZLS, 4967.29 N for 10,000-cycle zirconia, and 5041.99 N for 50,000-cycle zirconia. All mean load-to-fracture values were statistically significantly different (p< .05). However, there was no statistical influence of the number of cycles on the load-to-fracture of test crowns (p > .05). Load-to-fracture values of Zirconia and LDS CAD/CAM crowns were above the reported clinical posterior occlusal forces (720 N according to Gibbs et al.) and ZLS load-to-fracture values were closest to the average posterior occlusal force value. Further clinical and laboratory investigation are needed on the use of ZLS ceramic.
Burak Yilmaz (Advisor)
William Brantley (Committee Member)
William Johnston (Committee Member)
Scott Schricker (Committee Member)
47 p.
Dentistry
Load-to-Fracture,Monolithic Zirconia,Lithium Disilicate,Zirconia-Reinforced Lithium Silicate Glass-Ceramic

Recommended Citations

Citations

  • Kashkari, A. (2016). Comparison of Load-to-Fracture Values and Fracture Characterization of Monolithic Zirconia, Lithium Disilicate, and Zirconia-Reinforced Lithium Silicate Glass-Ceramic CAD/CAM Crowns [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469039766

    APA Style (7th edition)

  • Kashkari, Afnan. Comparison of Load-to-Fracture Values and Fracture Characterization of Monolithic Zirconia, Lithium Disilicate, and Zirconia-Reinforced Lithium Silicate Glass-Ceramic CAD/CAM Crowns. 2016. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1469039766.

    MLA Style (8th edition)

  • Kashkari, Afnan. "Comparison of Load-to-Fracture Values and Fracture Characterization of Monolithic Zirconia, Lithium Disilicate, and Zirconia-Reinforced Lithium Silicate Glass-Ceramic CAD/CAM Crowns." Master's thesis, Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469039766

    Chicago Manual of Style (17th edition)

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This open access ETD is published by The Ohio State University and OhioLINK.