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Article Dans Une Revue Dental Materials Année : 2014

Influence of firing time and framework thickness on veneered Y-TZP discs curvature

B.D. Jakubowicz-Kohen
  • Fonction : Auteur
M.J. Sadoun
  • Fonction : Auteur
A.K. Mainjot
  • Fonction : Auteur

Résumé

Objectives The objective of the present work was to study the curvature of very thinly, veneered Y-TZP discs of different framework thicknesses submitted to different firing times. Methods Fifteen 20-mm-wide Y-TZP discs were produced in three different thicknesses: 0.75, 1, 1.5 mm. One disc from each group was left unveneered while the others were layered with a 0.1 mm veneering ceramic layer. All discs underwent five firing cycles for a total cumulative firing time of 30 min, 1, 2, 5 and 10 h at 900 C. The curvature profile was measured using a profilometer after the veneering process and after each firing cycle respectively. A fitted curve was then used to estimate the, curvature radius. The coefficient of thermal expansion (CTE) measurements were taken on veneering, ceramic and Y-TZP beam samples that underwent the same firing schedule. Those data were used to calculate the curvature generated by CTE variations over firing time. Results All bilayered samples exhibited a curvature that increased over firing time inversely to framework thickness. However non-veneered samples did not exhibit any curvature modification. Significance The results of the present study reveal that even a very thin veneer layer (0.1 mm) can induce a significant curvature of Y-TZP discs. The dilatometric results showed that Tg and CTE, variations are not sufficient to explain this curvature. A chemical-induced zirconia volume, augmentation located at the framework sub-surface near the interface could explain the sample, curvature and its increase with firing time. © 2013 Academy of Dental Materials.
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Dates et versions

hal-01808070 , version 1 (05-06-2018)

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Citer

B.D. Jakubowicz-Kohen, M.J. Sadoun, Thierry Douillard, A.K. Mainjot. Influence of firing time and framework thickness on veneered Y-TZP discs curvature. Dental Materials, 2014, 30 (2), pp.242-248. ⟨10.1016/j.dental.2013.11.009⟩. ⟨hal-01808070⟩
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