Long‐term in vivo and in vivo aging of a zirconia ceramic used in orthopaedy

Abstract

A detailed study of a commercial zirconia (Y-TZP) aged at 37 degrees C held in Ringer's solution or transplanted in animals or humans is reported. No degradation in strength was found for MOR bars or for hip joint heads subjected to stresses caused by pressing titanium alloy trunnions into the head tapers with loads up to 30 kN. Polished specimens also showed no increase in the monoclinic phase percentage upon aging for 1 year. Small specimens transplanted in animals experience no change in the micro-indentation KIC toughness value, suggesting no degradation. Zirconia heads recovered after 2 years of human implantation showed no loss of strength. The difference between the excellent performances of this ceramic presented here and other studies can be accounted by the microstructural design and quality of the zirconia.

Current status of zirconia-based fixed restorations

“…The majority of zirconia frameworks have been made with yttria-stabilized, tetragonal zirconia polycrystal ceramics (Y-TZP). The yttria (Y 2 O 3 ) ceramic is present at only 2% to 3% mol (2). A valuable feature of this Y-TZP ceramic is its "transformation toughening" effect (3).…”

Effect of an internal coating technique on tensile bond strengths of resin cements to zirconia ceramics

“…Zirconia is a high flexural strength ceramic 2) which has been used as an orthopedic material 3) . Based on these improved physical properties compared with alumina-based ceramics, zirconia ceramic was introduced to restorative dentistry for the restoration of posterior teeth.…”

Artificial Aging of Zirconium Dioxide: An Evaluation of Current Knowledge and Clinical Relevance

“…Zirconia is a chemically inert material with low toxicity [3,15]. Owing to its high flexural, fracture strength, hardness, modulus of elasticity and wear resistance [4], in the late 80s, zirconia has been used in medicine to manufacture orthopedic femoral head prostheses [14][15][16].…”

“…Owing to its high flexural, fracture strength, hardness, modulus of elasticity and wear resistance [4], in the late 80s, zirconia has been used in medicine to manufacture orthopedic femoral head prostheses [14][15][16]. Unfortunately, between 2000 and 2002, a large number of failures were observed in a short period of time, generating a major public health concern.…”