Τίτλος:
Aging resistance of surface-treated dental zirconia
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
The influence of surface treatment on the low-temperature degradation (LTD) of tetragonal zirconia polycrystalline (TZP) is still unclear. Objectives The effect of surface treatments on the LTD behavior of zirconia was investigated. Methods Fully-sintered specimens of seven commercial dental zirconia (Aadva, GC; In-CeramYZ, VITA; IPS e.max ZirCAD, Ivoclar Vivadent; LAVA Frame and LAVA Plus, 3M ESPE; NANOZR, Panasonic; ZirTough, Kuraray Noritake) were provided by the manufacturers with specimen dimensions of approximately 10 mm × 5 mm × 3 mm. For each zirconia grade, samples were kept 'as sintered' (untreated) or were subjected to one of the three surface treatments: rough polished, sandblasted with Al2O3, tribochemical silica sandblasted (n = 3/group). The tetragonal to monoclinic transformation was evaluated by X-ray diffraction at several intervals during LTD testing up to 40 h in steam in an autoclave (134 °C, 2 bar). Results The five yttria-stabilized TZP (Y-TZP: Aadva, In-CeramYZ, IPS e.max ZirCAD, LAVA Frame, LAVA Plus) zirconia showed a similar trend in LTD behavior. The Al2O3 sandblasted zirconia showed the highest monoclinic volume fraction. The as sintered (untreated) zirconia degraded faster than the surface-treated zirconia. Although the surface-treated ceria-stabilized TZP/alumina (Ce-TZP/Al2O3: NANOZR) zirconia had a higher initial monoclinic volume fraction compared to the Y-TZP zirconia, it showed a stronger aging resistance. The as sintered (untreated) Y-TZP/alumina (Y-TZP/Al2O3: ZirTough) zirconia showed a strong aging resistance, whereas the surface-treated Y-TZP/Al2O3 zirconia degraded slightly. Significance Surface treatment improved the aging resistance of Y-TZP zirconia. Surface treatment did not affect the LTD behavior of Ce-TZP/Al2O3 zirconia, while surface treatment decreased the aging resistance of Y-TZP/Al2O3 zirconia. © 2014 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
Συγγραφείς:
Inokoshi, M.
Vanmeensel, K.
Zhang, F.
De Munck, J.
Eliades, G.
Minakuchi, S.
Naert, I.
Van Meerbeek, B.
Vleugels, J.
Περιοδικό:
DENTAL MATERIALS
Εκδότης:
ELSEVIER SCIENCE INC 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
Λέξεις-κλειδιά:
Aging of materials; Alumina; Aluminum oxide; Cerium oxide; Indium compounds; Silica; Sintering; Surface treatment; Temperature; Volume fraction; Yttrium oxide; Zirconia, Low-temperature degradations; Rough polishing; Sintered specimen; Specimen dimension; Tetragonal zirconia; Tetragonal-to-monoclinic transformation; Tribochemical silica sandblasting; Yttria-stabilized, Surface resistance, acrylic acid resin; aluminum oxide; dental porcelain; In-Ceram Zirconia; IPS e.max CAD LT; polyurethan; resin; silicon dioxide; Vita Hi Ceram; Vivadent; yttria; yttrium; zirconium; zirconium oxide, chemistry; dental etching; materials testing; procedures; surface property; X ray diffraction, Acrylic Resins; Aluminum Oxide; Composite Resins; Dental Etching; Dental Porcelain; Materials Testing; Polyurethanes; Silicon Dioxide; Surface Properties; X-Ray Diffraction; Yttrium; Zirconium
DOI:
10.1016/j.dental.2014.11.018
