The effect of the veneering procedures on the biaxial flexural strength of partially- and fully-stabilized zirconia core materials

Yıl 2015, Cilt: 32 Sayı: 1, 12 - 18, 09.02.2015

Melek Kavasoğlu Cihan Akçaboy

https://doi.org/10.17214/aot.43706

Cited By: 1

Öz

OBJECTIVE: The purpose of this study was to evaluate the effect of heat treatment and veneering procedures on the biaxial flexural strength of partially- and fully-sinterized zirconia core materials.

MATERIALS AND METHOD: Disc-shaped specimens (n=54;15 mm in diameter and 1 mm in thickness) were prepared from fully- and partially-stabilized zirconia blocks by using computer-aided design and computer-aided manufacturing (CAD/CAM) technology. The discs were divided randomly into 6 groups, each comprising 9 samples. The groups were established as the control group, heat-treated group and veneering group. Biaxial flexural strength (piston on three balls) was determined for all specimens. The data were analyzed by using one-way ANOVA (analysis of variance) test.

RESULTS: In partially-stabilized zirconia specimens, differences between the mean biaxial flexural strength values of the control and the heat-treated group, and control and the veneering group were not statistically significant (p=0.227 and p=0.351, respectively). For fully-stabilized zirconia specimens, the biaxial flexural strength values were significantly lower in the heat-treated group compared with the control and the veneering group (p=0.022 and p<0.001, respectively). The mean biaxial flexural strength values of the control and the veneering group were not significantly different (p=0.211).

CONCLUSION: When comparing the mean biaxial flexural strength values of all groups, the greatest values were found in the fully-sinterized and veneered group and the lowest values were found in the partially-sinterized and heat-treated group.

Anahtar Kelimeler

Ceramics, Dental Porcelain, Yttria Stabilized Tetragonal Zirconia

Üst yapı porseleni uygulamasının yarı ve tam sinterize zirkonya alt yapıların bükülme dayanıklılıklarına etkisi

Öz

AMAÇ: Bu çalışmanın amacı, ısı işlemi ve üst yapı porseleni
uygulamasının yarı ve tam sinterize zirkonya alt yapıların bükülme dayanıklılıklarına etkisinin incelenmesidir.
GEREÇ VE YÖNTEM: Yarı ve tam sinterize bloklardan 15 mm çapında
ve 1 mm kalınlığında 54 adet disk şeklindeki örnek bilgisayar
destekli tasarım ve üretim tekniği (CAD/CAM)
kullanılarak hazırlandı. Gruplar uygulanan işlemlere göre,
kontrol grubu, ısı uygulanmış grup ve üst yapı porseleni uygulanmış
grup olarak ayrıldı (n=9). Tüm örneklere iki-eksenli
bükülme dayanıklılığı testi (üç top üzerinde piston) uygulandı.
Veriler tek yönlü varyans analizi yöntemi ile değerlendirildi.
BULGULAR: Yarı sinterize zirkonya örneklerde kontrol grubu
ile ısı uygulanan ve üst yapı porseleni uygulanan gruplar arasında
biaksiyel bükülme dayanıklılığı yönünden istatistiksel
olarak anlamlı fark bulunamadı (sırasıyla p=0.227 ve
p=0.351). Tam sinterize zirkonya örneklerde ısı uygulaması
bükülme dayanıklılığını kontrole ve üst yapı porseleni uygulanan
gruplara göre belirgin olarak azalttı (sırasıyla p=0.022
ve p < 0.001); üst yapı porseleni uygulanan grup ile kontrol
grubu arasında ise anlamlı fark bulunamadı (p=0.211).
SONUÇ: Tüm grupların ortalama bükülme dayanıklılığı değerleri incelendiğinde, en yüksek bükülme dayanıklılığını
üst yapı porseleni uygulanan tam sinterize zirkonya örnekler,
en düşük bükülme dayanıklılığını ısı uygulaması yapılan
yarı sinterize zirkonya örnekler gösterdi.

Anahtar Kelimeler

Dental Porselen, Seramikler, Yttria Stabilize Dörtgen Zirkon

Kaynakça

• Guazzato M, Quach L, Albakry M, Swain MV. Influence of surface and heat treatments on the flexural strength of Y-TZP dental ceramic. J Dent 2005;33:9-18.
• Isgrò G, Pallav P, van der Zel JM, Feilzer AJ. The influence of the veneering porcelain and different surface treatments on the biaxial flexural strength of a heat-pressed ceramic. J Prosthet Dent 2003;90:465- 73.
• Guazzato M, Albakry M, Ringer SP, Swain MV. Strength, fracture toughness and microstructure of a selection of all-ceramic materials. Part II. Zirconia-based dental ceramics. Dent Mater 2004;20:449-56.
• Zarone F, Russo S, Sorrentino R. From porcelain-fused-to-metal to zirconia: clinical and experimental considerations. Dent Mater 2011;27:83-96.
• Kohorst P, Herzog TJ, Borchers L, Stiesch-Scholz M. Load-bearing capacity of all-ceramic posterior four-unit fixed partial dentures with different zirconia frameworks. Eur J Oral Sci 2007;115:161-6.
• Aboushelib MN, de Jager N, Kleverlaan CJ, Feilzer AJ. Effect of loading method on the fracture mechanics of two layered all-ceramic restorative systems. Dent Mater 2007;23:952-9.
• Studart AR, Filser F, Kocher P, Lüthy H, Gauckler LJ. Mechanical and fracture behavior of veneer-framework composites for all-ceramic dental bridges. Dent Mater 2007;23:115-23.
• Studart AR, Filser F, Kocher P, Gauckler LJ. Fatigue of zirconia under cyclic loading in water and its implications for the design of dental bridges. Dent Mater 2007;23:106-14.
• Borba M, de Araújo MD, de Lima E, Yoshimura HN, Cesar PF, Griggs JA, et al. Flexural strength and failure modes of layered ceramic structures. Dent Mater 2011;27:1259-66.
• Piconi C, Maccauro G. Zirconia as a ceramic biomaterial. Biomaterials 1999;20:1-25.
• Manicone PF, Rossi Iommetti P, Raffaelli L. An overview of zirconia ceramics: basic properties and clinical applications. J Dent 2007;35:819- 26.
• Denry I, Kelly JR. State of the art of zirconia for dental applications. Dent Mater 2008;24:299-307.
• Yilmaz H, Nemli SK, Aydin C, Bal BT, Tıraş T. Effect of fatigue on biaxial flexural strength of bilayered porcelain/zirconia (Y-TZP) dental ceramics. Dent Mater 2011;27:786-95.
• Albakry M, Guazzato M, Swain MV. Biaxial flexural strength, elastic moduli, and x-ray diffraction characterization of three pressable all-ceramic materials. J Prosthet Dent 2003;89:374-80.
• Karakoca S, Yilmaz H. Influence of surface treatments on surface roughness, phase transformation, and biaxial flexural strength of Y-TZP ceramics. J Biomed Mater Res B Appl Biomater 2009;91:930-7.
• International Organization for Standardization. ISO 6872:1995, Dental ceramic. Geneva: ISO; 1995.
• Hsueh CH, Luttrell CR, Becher PF. Analyses of multilayered dental ceramics subjected to biaxial flexure tests. Dent Mater 2006;22:460- 9.
• Hsueh CH, Thompson GA. Appraisal of formulas for stresses in bilayered dental ceramics subjected to biaxial moment loading. J Dent 2007;35:600-6.
• Hsueh CH, Kelly JR. Simple solutions of multilayered discs subjected to biaxial moment loading. Dent Mater 2009;25:506-13.
• Oilo M, Gjerdet NR, Tvinnereim HM. The firing procedure influences properties of a zirconia core ceramic. Dent Mater 2008;24:471-5.
• Guazzato M, Albakry M, Quach L, Swain MV. Influence of surface and heat treatments on the flexural strength of a glass-infiltrated alumina/zirconia-reinforced dental ceramic. Dent Mater 2005;21:454- 63.
• 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;15:426-33.
• Sundh A, Molin M, Sjögren G. Fracture resistance of yttrium oxide partially-stabilized zirconia all-ceramic bridges after veneering and mechanical fatigue testing. Dent Mater 2005;21:476-82.
• Sundh A, Sjögren G. Fracture resistance of all-ceramic zirconia bridges with differing phase stabilizers and quality of sintering. Dent Mater 2006;22:778-84.
• Tsalouchou E, Cattell MJ, Knowles JC, Pittayachawan P, McDonald A. Fatigue and fracture properties of yttria partially stabilized zirconia crown systems. Dent Mater 2008;24:308-18.
• Fischer J, Stawarczyk B, Hämmerle CH. Flexural strength of veneering ceramics for zirconia. J Dent 2008;36:316-21.
• Sundh A, Sjögren G. A comparison of fracture strength of yttriumoxide- partially-stabilized zirconia ceramic crowns with varying core thickness, shapes and veneer ceramics. J Oral Rehabil 2004;31:682-8.
• Lin WS, Ercoli C, Feng C, Morton D. The effect of core material, veneering porcelain, and fabrication technique on the biaxial flexural strength and weibull analysis of selected dental ceramics. J Prosthodont 2012;21:353-62.
• Piddock V, Marquis PM, Wilson HJ. The mechanical strength and microstructure of all-ceramic crowns. J Dent 1987;15:153-8.
• Larsson C, El Madhoun S, Wennerberg A, Vult von Steyern P. Fracture strength of yttria-stabilized tetragonal zirconia polycrystals crowns with different design: an in vitro study. Clin Oral Implants Res 2012;23:820-6.
• Mitov G, Gessner J, Lohbauer U, Woll K, Muecklich F, Pospiech P. Subcritical crack growth behavior and life data analysis of two types of dental Y-TZP ceramics. Dent Mater 2011;27:684-91.
• Guazzato M, Proos K, Quach L, Swain MV. Strength, reliability and mode of fracture of bilayered porcelain/zirconia (Y-TZP) dental ceramics. Biomaterials 2004;25:5045-52.
• de Kler M, de Jager N, Meegdes M, van der Zel JM. Influence of thermal expansion mismatch and fatigue loading on phase changes in porcelain veneered Y-TZP zirconia discs. J Oral Rehabil 2007;34:841- 7.