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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What to know about zinc air batteries. Your hearing aids take batteries that are unlike your typical household ones, and with a bit of background knowledge you can extend the lives of the batteries. In order for your hearing aids to work properly, you need to replace their zinc air batteries regularly. But these devices don't take your traditional AA or AAA batteries that may be lying around your house. Hearing aid batteries are called zinc air batteries, and they come in five sizes.