By James F. Shackelford
Offers a accomplished survey of the sphere of bioceramics, from the historical past of biomaterials, regularly, and bioceramics, particularly, to the trendy reports of biomimetics. the most sections/chapters of the booklet concentrate on the composition of 9 sorts of bioceramics (Al2O3-based, ZrO2-based, different easy oxides, hydroxyapatite, different calcium salts, silicate ceramics, silicate glasses, glass ceramics, ceramic- matrix composites) and the scientific functions of those fabrics in orthopaedics, dentistry and the remedy of cancerous tumors. Bioceramics will attract ceramic and mechanical engineers, clinical and dental pros, and scholars of advanced-level classes in similar fields.
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Additional info for Bioceramics
Approximately 90% of the matrix is collagen. Because of the high concentration of hydroxyapatite, dentin is a relatively brittle material. 4 CHITIN After collagen, chitin is the second most common component of connective tissues in animals (Martin 1996b). Chitin is chemically similar to cellulose and has a lamellar structure similar to wood or bone. Its elastic modulus is close to that of hardwoods and bone, and it tends to be mixed with protein for the purpose of adjusting its mechanical properties to the specific structural need.
The injected paste hardens due to the crystallization of dahllite within about 10 minutes. Dahllite is a carbonated hydroxyapatite. The specific formula for the crystallized paste in this system is Ca8. 3, which would indicate some substitution by acidic phosphate, . The paste’s initial compressive strength is 10 MPa, and, within 12 hours, the conversion to dahllite is about 90% complete giving a final compressive strength of 55 MPa, a value greater than that of cancellous bone. 1 MPa, a value about the same as that for cancellous bone.
In a similar way, the acetabular cup can be fabricated from Al2O3 or PSZ. The low toughness of these structural ceramics, however, has contributed to a continued dominance by polyethylene. The PMMA cement for fixation does not have a serious ceramic competitor. One must also be aware of the materials implications of new orthopaedic surgical technologies. An important example is the recent development of robotic surgery (Paul et al. 1994). 2) The initial demonstration of feasibility for this technique was made at the University of California-Davis using an image-driven machining tool for total hip replacement in the dog.
Bioceramics by James F. Shackelford