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VOLUME 19 , ISSUE 7 ( 2018 ) > List of Articles

ORIGINAL RESEARCH

The Effect of in vitro Aging and Fatigue on the Flexural Strength of Monolithic High-translucency Zirconia Restorations

Fawaz Alqahtani, Hosain M Almansour

Keywords : Accelerated artificial aging, Biaxial flexural strength, Fatigue, Monolithic high-translucency zirconia

Citation Information : Alqahtani F, Almansour HM. The Effect of in vitro Aging and Fatigue on the Flexural Strength of Monolithic High-translucency Zirconia Restorations. J Contemp Dent Pract 2018; 19 (7):867-873.

DOI: 10.5005/jp-journals-10024-2349

License: CC BY-NC 3.0

Published Online: 01-07-2018

Copyright Statement:  Copyright © 2018; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Aim: The aim of this in vitro study was to evaluate the effect of accelerated artificial aging (AAA) and fatigue on the biaxial flexural strength (BFS) of three types of monolithic hightranslucency zirconia restorations compared with conventional low-translucency zirconia restorations. Materials and methods: Four groups of 20 disc-shaped specimens (10 × 1.2 mm) were made from the following computeraided design and computer-aided manufacturing (CAD/CAM) zirconia blocks: Low-translucency zirconia (Ceramill ZI-LT) as a control, and three brands of high-translucent zirconia (Lava Plus, Ceramill Zolid White, and Copran Monolithic HT). Ten discs from each group were subjected to the BFS test using the universal testing machine. The other 10 discs from each group were subjected to AAA (thermocycling, 3,500 cycles) and fatigue (250,000 cycles) before the fracture test. The definitive fracture load was recorded, and the BFS was calculated in accordance with International Organization for Standardization (ISO) 6872. The data were analyzed with one-way analysis of variance (ANOVA), Scheffe post hoc, and Mann-Whitney U test. Data analyses were evaluated at a significance level of p ≤ 0.05. Results: Significant differences were detected in the BFS among the four groups before AAA and fatigue. The mean BFS was highest with Ceramill ZI (935.3 ± 47.1 MPa), and least in Ceramill Zolid White (685.7 ± 32.6 MPa). After AAA and fatigue, significant differences were reported where the mean of BFS was highest with Copran Zr-i Monolithic HT (777.5 ± 21.2 MPa), and least in Ceramill Zolid White (576.0 ± 36.3 MPa). Furthermore, Mann–Whitney U test showed that AAA and fatigue significantly affect the BFS of each material individually. Conclusion: The AAA and fatigue significantly affected the BFS of the monolithic high-translucency zirconia restorations. Clinical significance: Although monolithic high-translucency zirconia had significantly lower BFS than conventional zirconia tested in this study, they still have sufficient strength for clinical use.


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  1. Kelly JR, Nishimura I, Campbell SD. Ceramics in dentistry: historical roots and current perspectives. J Prosthet Dent 1996 Jan;75(1):18-32.
  2. Hayashi M, Tsuchitani Y, Kawamura Y, Miura M, Takeshige F, Ebisu S. Eight-year clinical evaluation of fired ceramic inlays. Oper Dent 2000 Nov-Dec;25(6):473-481.
  3. van Dijken, JW. All-ceramic restorations: classification and clinical evaluations. Compend Contin Educ Dent 1999 Dec;20(12):1115-1124, 1126 passim; quiz 1136.
  4. Griffin JD. Combining monolithic zirconia crowns, digital impressioning, and regenerative cement for a predictable restorative alternative to PFM. Compend Contin Educ Dent 2013 Mar;34(3):212-222.
  5. Mörmann WH. The evolution of the CEREC system. J Am Dent Assoc 2006 Sep;137 (Suppl):7S-13S.
  6. Zesewitz TF, Knauber AW, Northdurft FP. Fracture resistance of a selection of full-contour all-ceramic crowns: an in vitro study. Int J Prosthodont 2014 May-Jun;27(3):264-266.
  7. Sailer I, Fehér A, Filser F, Lüthy H, Gauckler LJ, Schärer P, Franz Hämmerle CH. Prospective clinical study of zirconia posterior fixed partial dentures: 3-year follow-up. Quintessence Int 2006 Oct;37(9):685-693.
  8. Sailer I, Pjetursson BE, Zwahlen M, Hämmerle CH. A systematic review of the survival and complication rates of all-ceramic and metal-ceramic reconstructions after an observation period of at least 3 years. Part II: Fixed dental prostheses. Clin Oral Implants Res 2008 Mar;19(3):326-328.
  9. Preis V, Behr M, Hahnel S, Handel G, Rosentritt M. In vitro failure and fracture resistance of veneered and full-contour zirconia restorations. J Dent 2012 Nov;40(11):921-928.
  10. Beuer F, Stimmelmayr M, Gueth JF, Edelhoff D, Naumann M. In vitro performance of full-contour zirconia single crowns. Dent Mater 2012 Apr;28(4):449-456.
  11. Vichi A, Sedda M, Fabian Fonzar R, Carrabba M, Ferrari M. Comparison of contrast ratio, translucency parameter, and flexural strength of traditional and “Augmented Translucency” Zirconia for CEREC CAD/CAM System. J Esthet Restor Dent 2016 Mar;28 Suppl 1:S32-S39.
  12. de Kok P, Kleverlaan CJ, de Jager N, Kuijs R, Feilzer AJ. Mechanical performance of implant-supported posterior crowns. J Prosthet Dent 2015 Jul;114(1):59-66.
  13. Church TD, Jessup JP, Guillory VL, Vandewalle KS. Translucency and strength of high-translucency monolithic zirconium oxide materials. Gen Dent 2017 Jan-Feb;65(1):48-52.
  14. Atay A, Oruç S, Ozen J, Sipahi C. Effect of accelerated aging on the color stability of feldspathic ceramic treated with various surface treatments. Quintessence Int 2008 Jul-Aug;39(7):603-609.
  15. Gale MS, Darvell BW. Thermal cycling procedures for laboratory testing of dental restorations. J Dent 1999 Feb;27(2):89-99.
  16. ISO 6872:2008. Dentistry—ceramic materials. Geneva: International Organization for Standardization; 2008.
  17. Mijoska A, Popovska M. Evaluation of different in vitro testing methods for mechanical properties of veneer ceramics. Pril (Makedon Akad Nauk Umet Odd Med Nauki) 2015;36(1):225-230.
  18. De Groot R, Peters MC, De Haan YM, Dop GJ, Plasschaert AJ. Failure stress criteria for composite resin. J Dent Res 1987 Dec;66(12):1748-1752.
  19. Bankoðlu Güngör M, Yýlmaz H, Aydýn C, Karakoca Nemli S, Turhan Bal B, Týraþ T. Biaxial flexural strength and phase transformation of Ce-TZP/Al2O3 and Y-TZP core materials after thermocycling and mechanical loading. J Adv Prosthodont 2014 Jun;6(3):224-232.
  20. Flinn BD, deGroot DA, Mancl LA, Raigrodski AJ. Accelerated aging characteristics of three yttria-stabilized tetragonal zirconia polycrystalline dental materials. J Prosthet Dent 2012 Oct;108(4):223-230.
  21. Flinn BD, Raigrodski AJ, Mancl LA, Toivola R, Kuykendall T. Influence of aging on flexural strength of translucent zirconia for monolithic restorations. J Prosthet Dent 2017 Feb;117(2): 303-309.
  22. Cotes C, Arata A, Melo RM, Bottino MA, Machado JP, Souza RO. Effects of aging procedures on the topographic surface, structural stability, and mechanical strength of a ZrO2-based dental ceramic. Dent Mater 2014 Dec;30(12):e396-e404.
  23. Souza RO, Valandro LF, Melo RM, Machado JP, Bottino MA, Ozcan M. Air–particle abrasion on zirconia ceramic using different protocols: effects on biaxial flexural strength after cyclic loading, phase transformation and surface topography. J Mech Behav Biomed Mater 2013 Oct;26:155-163.
  24. Pittayachawan P, McDonald A, Petrie A, Knowles JC. The biaxial flexural strength and fatigue property of Lava Y-TZP dental ceramic. Dent Mater 2007 Aug;23(8):1018-1029.
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