What are the types of Dentin? 1) Pre dentin (not mineralized yet) 2) Mantle dentin (mostly type III collagen) Circumpulpal dentin a) Primary dentin formed first b) cells slow down (due to overcrowding of odontoblast) and make secondary dentin c) Tertiary dentin made if cavity or crack etc.
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The four major technologies used for miniature batteries are: lithium, zinc air, alkaline, and silver oxide. Button cell batteries can contain 0-25 mg of mercury (and sometimes more). Lithium miniature batteries contain no intentionally-added mercury. However, small amounts of mercury are still added to most zinc air, alkaline and silver oxide miniature batteries in order to prevent the formation of internal gases that can cause leakage.