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Osseointegration Vs. Biointegration
In 1985, dePutter observed that there are two ways of implant anchorage or retention: mechanical and bioactive. Mechanical retention refers to the metallic substrate systems such as titanium alloy. The retention is based on the undercut forms such as vents, slots, dimples, screws etc and involves direct contact between the dioxide layer on the base metal and bone with no chemical bonding. Bioactive retention is achieved with bioactive materials such as hydroxyapatite (HA), which bond directly to the bone, similar to ankylosis of natural teeth. Bone matrix is deposited on the HA layer as a result of physicochemical interaction between the collagen of bone and the HA crystals of the implant.
have any picture this expiriment at record?
Particulate matter in gaseous effluents consists of particles of size ranging from 0.1 um to 100 um. The device selection is based upon physical and chemical characteristic of part
Clotting Disorder - Haemophilia Haemophilia is a congenital blood clotting disorder caused by the genetic lack/ deficiency of coagulation factor VIII or antihaemophiliac
Q. Does each amino acid have a central carbon? To which organic group is that central carbon bound? A carboxyl group -NH 2 , an atom of hydrogen - COOH, an amine group-H and a
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recptors and effectors
An element playing significant role in nitrogen fixation is : 1. Molybdenum 2. Copper 3. Manganese 4. Zinc An element playing significant role in nitrogen fixation
Define Techniques for Detection Hidden Root Canals Three well-angulated periapical films for 3D morphology: o With the cone directed straight on. o Mesiobilque. o And disto
What are the main structures within the cell nucleus? Within the cell nucleus the major structures are: the nucleolus, an optically dense region, spherical shaped, where there
Q. What are the conditions favouring the outbreak of Staphylococcal food poisoning? • Botulism is caused by the bacteria Clostridium botulinum. • All low acid foods can s
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