In vitro evaluation of fracture resistance and cyclic fatigue resistance of computer-aided design-on and hand-layered zirconia crowns following cementation on epoxy dies

Aim: This in vitro study was to compare the fracture resistance and cyclic fatigue resistance of hand-layered zirconia crowns and computer-aided design (CAD)-on crowns (lithium disilicate with zirconium oxide). Settings and Design: Comparative -Invitro study design. Materials and Methods: All cerami...

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Bibliographic Details
Published in:The journal of Indian Prosthodontic Society 2020-01, Vol.20 (1), p.90-96
Main Authors: Pandurangan, Kiran, Veeraiyan, Deepak, Nesappan, Thiyaneswaran
Format: Article
Language:English
Subjects:
Academic achievement
Analysis
CAD software
CAD-CAM systems industry
Cement
Computer aided design
Epoxy resins
Fatigue (Materials)
Lithium
Mandible
Manufacturers
Metal fatigue
Original
Production management
Prostheses
Silicon nitride
Statistical analysis
Teeth
Testing equipment
Zirconia
Zirconium
Zirconium oxide
Zirconium oxides
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Summary:Aim: This in vitro study was to compare the fracture resistance and cyclic fatigue resistance of hand-layered zirconia crowns and computer-aided design (CAD)-on crowns (lithium disilicate with zirconium oxide). Settings and Design: Comparative -Invitro study design. Materials and Methods: All ceramic crown preparation was done on a mandibular molar ivorine tooth, impression made, and duplicated. Twenty hand-layered zirconia crowns and twenty CAD-on crowns were fabricated using CAD/computer-aided manufacturing (CAD/CAM) technique. All crowns were cemented to their respective dies using resin cement for evaluating fracture resistance and cyclic fatigue resistance using universal testing machine. Statistical Analysis Used: Independent samples t-test, Mann-Whitney U-test, and Shapiro-Wilk test were used. Results: The mean fracture resistance of CAD-on crowns (2660.50 ± 501.303 N) was significantly more than that of hand-layered zirconia crowns (1963.60 ± 452.895 N) (independent samples t-test, P < 0.023). Cyclic fatigue resistance test results showed that the mean number of cycles before failure for hand-layered zirconia crowns was 175,297 and for CAD-on crowns was 212,097 (Mann-Whitney U-test, P < 0.012). Conclusion: CAD-on crowns were found to have significantly higher fracture resistance and cyclic fatigue resistance properties than hand-layered zirconia crowns.
ISSN:0972-4052
1998-4057
DOI:10.4103/jips.jips_222_19