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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.
Distinguish among the terms 'pesticide', 'insecticide' and 'herbicide. A pesticide is a compound which destroys or controls any organism which is considered to be harmful
Frequency - Synthetic Characters This term refers to the degree of dispersion of individual species in an area, and is usually expressed in terms of percentage. Frequency can
What are some mechanisms by which pathogenic bacteria cause diseases? Why is this knowledge important? Pathogenic bacteria have characteristics called as virulence factors that
Differentiation is largely a matter of gene control and imprinting (CH3) plays a role, but ___ may also play a role.
Select the processes assist in the maintenance of high levels of dissolved solutes in the interstitial spaces of the kidney medulla? A. Net flux of sodium ions from intracellul
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This is a rare manifestation seen in less than 5 per cent of ARF patients. It is erythematous, macular, evanescent, non-pruritic rash with pale centre and serpiginous or rounded bo
what is animals respiration explain
Making leaf collections Collect young leaves of as many varieties of plants as possible. Place various layers of news- paper or blotting paper on a firm, smooth board. Next org
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