*Review* **Oxide Bioceramic Composites in Orthopedics and Dentistry**

**Corrado Piconi \* and Simone Sprio**

National Research Council of Italy, Institute of Science and Technology for Ceramics (CNR-ISTEC), 48018 Faenza, Italy; simone.sprio@istec.cnr.it

**\*** Correspondence: corpico@libero.it

**Abstract:** Ceramic composites based on alumina and zirconia have found a wide field of application in the present century in orthopedic joint replacements, and their use in dentistry is spreading. The development of this class of bioceramic composites was started in the 1980s, but the first clinical applications of the total hip replacement joint were introduced in the market only in the early 2000s. Since then, several composite systems were introduced in joint replacements. These materials are classified as Zirconia-Toughened Alumina if alumina is the main component or as Alumina-Toughened Zirconia when zirconia is the main component. In addition, some of them may contain a third phase based on strontium exa-aluminate. The flexibility in device design due to the excellent mechanical behavior of this class of bioceramics results in a number of innovative devices for joint replacements in the hip, the knee, and the shoulder, as well in dental implants. This paper gives an overview of the different materials available and on orthopedic and dental devices made out of oxide bioceramic composites today on the market or under development.

**Keywords:** alumina; zirconia; Alumina-Toughened Zirconia; Zirconia-Toughened Alumina; hip arthroplasty; dental implants
