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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.
The hydrolysis of the disaccharide lactose (in milk) give up glucose and galactose. Thus galactose is also a major dietary sugar for humans. Glucose and Galactose are epimers which
Categories of alloplastic implant materials The entire groups of possible alloplastic implant materials, regardless of their clinical applications fall into the following categ
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Where do the two neuronal pathways diverge For both the neuronal pathways i.e. light reflex and near reflex the efferent fibres go to are 3rd cranial nerve and then to sphinct
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Gonial Apospory and Somatic Apospory Gonial Apospory There is no meiosis. The megaspore mother cell enlarges; a small vacuole appears above and below the nucleus. The c
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