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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.
What is light reaction? Light reactions are reactions, which are initiated by light (also photo-induced reactions). Usually, light energy is change into chemical energy.
Gills - Respiration Gills are highly vascularised extensions of gas exchange membranes. The simple type may be extension of the body surface as in sea-slugs, sea stars and ma
The major concentration of noradrenergic (and adrenergic) cell bodies is found in locus ceruleus a nucleus in the reticular formation. The axons of these neurons project through t
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Exchange transfusion An exchange transfusion is the serial withdrawal and injection of small amounts of blood through a central vein-usually umbilical until the required volu
Q. From which germ layer do the epidermis and the nervous system originate? What are other organs and tissues made from that germ layer? Epidermis and nervous system have the s
State the process of metabotropic receptors Consider a system that contains two neurons and one cardiac SA node cell in a culture dish bathed in normal physiological saline. A
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Polyarthritis 1) Gonococcal - Therapeutic trial of pencillin may help in diagnosis of gonococcal infection. 2) Viral infections such as rubella and hepatitis B may have
write six characteristics of bacteria
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