Details

Autor(en) / Beteiligte

• Santos, C.
• Teixeira, L.H.P.
• Daguano, J.K.M.F.
• Rogero, S.O.
• Strecker, K.
• Elias, C.N.

Titel

Mechanical properties and cytotoxicity of 3Y-TZP bioceramics reinforced with Al2O3 particles

Ist Teil von

• Ceramics international, 2009-03, Vol.35 (2), p.709-718

Erscheinungsjahr

2009

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The influence of Al2O3 additions and sintering parameters on the mechanical properties and cytotoxicity of tetragonal ZrO2-3 mol% Y2O3 ceramics was evaluated. Samples containing 0, 10, 20 and 30 wt% of Al2O3 particles were prepared by cold uniaxial pressing (80 MPa) and sintered in air at 1500, 1550 and 1600 C for 120 min. The effects of the sintering conditions on the microstructure were analysed by XRD and SEM. Hardness and fracture toughness were determined by the Vickers indentation method and the mechanical resistance by four-point bending tests. As a preliminary biological evaluation, in-vitro cytotoxicity tests were used to determine the cytotoxic level of the ZrO2-Al2O3 composites. Fully dense ceramic materials were obtained with a hardness ranging between 1340 and 1585 HV, depending on the amount of Al2O3 in the ZrO2 matrix. However, Al2O3 additions had no effect on fracture toughness. The non-cytotoxic behaviour, the elevated fracture toughness, the good bending strength and the elevated Weibull modulus exhibited by the material, showed that these ceramic composites are suitable biomaterials for dental implant applications.