Apatite‐forming ability of a zirconia/alumina nano‐composite induced by chemical treatment

Abstract

Induction of an apatite-forming ability on a nano-composite of a ceria-stabilized tetragonal zirconia polycrystals (Ce-TZP) and alumina (Al2O3) polycrystals via chemical treatment with aqueous solutions of H3PO4, H2SO4, HCl, or NaOH has been investigated. The Ce-TZP/Al2O3 composite is attractive as a load-bearing bone substitute because of its mechanical properties. The chemical treatments produced Zr-OH surface functional groups, which are known to be effective for apatite nucleation in a body environment. The composite, after chemical treatment, was shown to form a bonelike apatite layer when immersed in a simulated body fluid containing ion concentrations nearly equal to those in human blood plasma. This implies that it may form apatite in the living body and bond to living bone through the apatite layer. This type of bioactive Ce-TZP/Al2O3 composite is therefore expected to be useful as a bone substitute, even under load-bearing conditions.

Resin adhesion strengths to zirconia ceramics after primer treatment with silane coupling monomer or oligomer

“…The hypothesis in this study was that the bond strength to zirconia ceramics after applying the silane coupling oligomer would be higher than that when applying the monomer. This hypothesis was arrived at because the oligomer has a larger number of polymerizable methacryloyloxy groups per molecule, making it effective for use with the zirconia surface, which consists of a low density of hydroxyl groups 12,13) . Furthermore, the effects of acid activation before the application of silane coupling agents and heat treatment after the application were also investigated, because these factors are reported to be effective for the formation Si-O-substrate linkage in the case of silane coupling monomers for SiO 2 substrates 7) .…”

Zirconia Effect on the Bioactivity and the Mechanical Properties of Calcium Magnesium Silicate Ceramics at (CaO+MgO)/SiO2 Molar Ratio Close to Unity

“…As reported previously, this can be achieved through the coating of zirconia ceramics by bioactive materials (glass or hydroxyapatite) or biomimetic method. The latter, it can be conducted by different ways; 1-chemical treatment with different aqueous solution [10] 2-reimmersion method by more concentrated solutions (1.4 SBF, 1.5 SBF and 5 SBF) [11] and 3-presence of bioactive materials (e.g., bioactive glass or wollastonite beds) in the first time of immersion in SBF (first 7 days) followed by re-immersion in more concentrated solutions (1.4 SBF) for 14 days [12]. These scenarios especially no.…”

Effect of thickness of zirconia-ceramic crown frameworks on strength and fracture pattern

“…Today, restorations using Yttriastabilized tetragonal zirconia polycrystals (Y-TZP) are widely used in clinics. Ceria-stabilized tetragonal zirconia polycrystals (Ce-TZP) show very high toughness (23 MPa), but moderate flexural strength (450 MPa) and hardness (800 MPa) in comparison to Y-TZP (7 MPa, 1,000 MPa and 1,200 MPa, respectively) 7) . Therefore, Ce-TZP have not been used in the dental field.…”

“…Therefore, Ce-TZP have not been used in the dental field. Recently, Ce-TZP/Al 2O3 nanocomposites (Ce-TZP/A) (18 MPa, 1,000 MPa and 1,200 MPa, respectively) 7) were developed in order to compensate for the disadvantages of the low strength and hardness of Ce-TZP 8) . Ce-TZP/A consist of nanometer-sized Al2O3 particles which are dispersed within the Ce-TZP grains and the grain boundaries 8,9) , and nanometer-sized Ce-TZP particles which are dispersed within the Al2O3 grains and the boundaries.…”