Influence of Heat Treatment and Veneering on the Storage Modulus and Surface of Zirconia Ceramic

Georgius Siavikis; Michael Behr; Jef M van der Zel; Albert J Feilzer; Martin Rosentritt

doi:10.1055/s-0039-1698879

European Journal of Dentistry, Table of Contents

CC BY-NC-ND 4.0 · Eur J Dent 2011; 05(02): 191-198
DOI: 10.1055/s-0039-1698879

Original Article

Dental Investigation Society

Influence of Heat Treatment and Veneering on the Storage Modulus and Surface of Zirconia Ceramic

Georgius Siavikis

^aDepartment of Prosthetic Dentistry, Regensburg University Medical Center, Regensburg, Germany.

,

Michael Behr

^aDepartment of Prosthetic Dentistry, Regensburg University Medical Center, Regensburg, Germany.

,

Jef M van der Zel

^bDepartment of Dental Materials Science, Academic Centre for Dentistry, Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, Holland.

,

Albert J Feilzer

^bDepartment of Dental Materials Science, Academic Centre for Dentistry, Universiteit van Amsterdam and Vrije Universiteit, Amsterdam, Holland.

,

Martin Rosentritt

^aDepartment of Prosthetic Dentistry, Regensburg University Medical Center, Regensburg, Germany.

› Author Affiliations

Abstract

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ABSTRACT

Objectives: Glass-ceramic veneered zirconia is used for the application as fixed partial dentures. The aim of this investigation was to evaluate whether the heat treatment during veneering, the application of glass-ceramic for veneering or long term storage has an influence on the storage modulus of zirconia. Methods: Zirconia bars (Cercon, DeguDent, G; 0.5x2x20 mm) were fabricated and treated according to veneering conditions. Besides heating regimes between 680°C and 1000°C (liner bake and annealing), sandblasting (Al2O3) or steam cleaning were used. The bars were investigated after 90 days storage in water and acid. For investigating the influence of veneering, the bars were veneered in press- or layer technique. Dynamic mechanical analysis (DMA) in a three-point-bending design was performed to determine the storage modulus between 25°C and 200°C at a frequency of 1.66 Hz. All specimens were loaded on top and bottom (treatment on pressure or tensile stress side). Scanning electron microscopy (SEM) was used for evaluating the superficial changes of the zirconia surface due to treatment. Statistical analysis was performed using Mann Whitney U-test (α=0.05). Results: Sintered zirconia provided a storage modulus E’ of 215 (203/219) GPa and tan δ of 0.04 at 110°C. A 10%-decrease of E’ was found up to 180°C. The superficial appearance changed due to heating regime. Sandblasting reduced E’ to 213 GPa, heating influenced E’ between 205 GPa (liner bake 1) and 222 GPa (dentin bake 1). Steam cleaning, annealing and storage changed E’ between 4 GPa and 22 GPa, depending on the side of loading. After veneering, strong E’-reduction was found down to 84 GPa and 125 GPa. Conclusions: Veneering of zirconia with glass-ceramic in contrast to heat treating during veneering procedure had a strong influence on the modulus. The application of the glass-ceramic caused a stronger decrease of the storage modulus. (Eur J Dent 2011;5:191-198)

Key words:

Zirconia - Veneering - Storage Modulus - CAD CAM

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References

REFERENCES
1 Bornemann G, Rinke S, Huels A. Prospective clinical trial with conventionally luted zirconia-based fiexed partial dentures-18-month results. IADR/CED 2003 #842.
2 Pospiech P, Nothdurft FP. Long-term behaviour of zirconia-based bridges: three years results. IADR 2004 #230.
3 Vult von Steyern P, Carlson P, Nilner K. All-ceramic fixed partial dentures designed according to the DC-Zirkon technique. A 2-year clinical study. J Oral Rehabil 2005;32:180-187.
4 Aboushelib MN, Kleverlaan CJ, Feilzer AJ. Microtensile bond strength of different components of core veneered all-ceramic restorations. Part II: Zirconia veneering ceramics. Dent Mater 2006;22:857-863.
5 Tinschert J, Natt G, Mautsch W, Augthun M, Spiekermann H. Fracture resistance of lithium disilicate-, alumina-, and zirconia-based three-unit fixed partial dentures: a laboratory study. Inter J Prosthodont 2001;14:231-238.
6 Guazzato M, Proos K, Quach L, Swain MV. Strength, reliability and mode of fracture of bilayered porcelain/zirconia (Y-TZP) dental ceramics. Biomater 2004;25:5045-5052.
7 Taskonak B, Mecholsky JJ, Anusavice KJ. Residual stresses in bilayer dental ceramics. Biomater 2005;26:3235-3241.
8 Piconi C, Maccauro G. Zirconia as a ceramic biomaterial. Biomater 1999;20:1-25.
9 Papanagiotou HP, Morgano SM, Giordano RA, Pober R: In vitro evaluation of low-temperature aging effects and finishing procedures on the flexural strength and structural stability of Y-TZP dental ceramics. J Prosthetic Dent 2006;96:154-164.
10 Denry IL, Holloway JA. Microstructural and crystallographic surface changes after grinding zirconia-based dental ceramics. J Biomed Mater Res Part B, Appl Biomater 2006;76:440-448.
11 Lawn BR, Pajares A, Zhang Y, et al. Materials design in the performance of all-ceramic crowns. Biomater 2004;25:2885-2892.
12 Studart A, Filser F, Kocher P, Lüthy H, Gauckler LJ. Cyclic fatigue in water of veneer-framework composites for allceramic dental bridges. Dent Mater 2007;23:177-185.
13 Marx R, Jungwirth F, Walter PO. Threshold intensity factors as ower bounderies for crack propagation in ceramics. Biomed Engeneer Online 2004;3:41-50.
14 Roebben G, Basu B, Vleugels J, van der Biest O. Transformation-induced damping behaviour of Y-TZP zirconia ceramics. J Eur Ceramic Soc 2003;23:481-489.
15 Basu B, Donzel L, van Humbeek J, Vleugels J, Schaller R, van der Biest O. Thermal expansion and damping characteristics of Y-TZP. Scri Mater 1990;40:759-765.
16 Guazzato M, Quach L, Albakry M, Swain MV. Influence of surface and heat treatments on the flexural strength of YTZP dental ceramic. J Dent 2005;33:9-18.
17 Sundh A, Molin M, Sjogren G: Fracture resistance of yttrium oxide partially-stabilized zirconia all-ceramic bridges after veneering and mechanical fatigue testing. Dent Mater 2005;21:476-482.
18 Kosmac T, Oblak, C., Jevnikar, P., Funduk, N., Marion, L. The effect of surface grinding and sandblasting on flexural strength and reliability of Y-TZP zirconia ceramic. Dent Mater 1999;15:426-433.
19 Zhang Y, Lawn BR, Rekow ED, Thompson VP. Effect of sandblasting on the long-term performance of dental ceramics. J Biomed Mater Res Part B, Appl Biomater 2004;71:381-386.
20 Ardlin BI. Transformation-toughened zirconia for dental inlays, crowns and bridges: chemical stability and effect of low-temperature aging on flexural strength and surface structure. Dent Mater 2002;18:590-595.
21 Shimuzu K, Oka M, Kumar P, Kotoura Y, Makinouchi K. Time-dependent changes in the mechanical properties of zirconia ceramic. J Biomater Res 1993;27:729-734.
22 Lilley E. Review of low temperature degradation in Y-TZPs. In: Tressler RE, McNallan N, editors. Ceramic transactions: corrosion and corrosive degradation of ceramics. Westerville. Am Ceram Soc 1990:387-407.
23 De Jager N, Pallav P, Feilzer AJ. The influence of design parameters on the FEA-determined stress distribution in CAD-CAM produced all-ceramic dental crowns. Dent Mater 2005;21:242-251.
24 Kelly JR, Tesk, JA., Sorenson, JA. Failure of all-ceramic fixed partial dentures in vitro and in vivo: analysis and modeling. J Dent Res 1995;74:1253-1258.
25 Oh W, Gotzen N, Anusavice KJ. Influence of connector design on fracture probability of ceramic fixed-partial dentures. J Dent Res 2002;81:623-627.
26 Thompson GA, Rekow DE. Dental ceramics and the molar crown testing. J Apl Oral Sci 2004;12:26-36.
27 Lawn BR, Deng Y, Lloyd IK, Janal MN, Rekow ED, Thompson VP. Materials design of ceramic-based layer structures for crowns. J Dent Res 2002;81:433-438.
28 Rosentritt M, Steiger D, Behr M, Handel G, Kolbeck C. Influence of substructure design and spacer settings on the in vitro performance of molar zirconia crowns. J Dent 2009;37:978-983.