ACID ETCHING● 37% phosphoric / orthophosphoric acid● 10-15 second● Also known as conditioning of dentin.● While GIC by 10% polyacrylic Acid for 10 seconds.● White frosted appearance● Objective ー to increase the surface area and remove smear layer*● Alterations in time1. Primary tooth(inorganic content is less)ー 30 Secs2. Fluorosed tooth ー30 seconds3. Contaminated tooth, when doing re-etching ー etch for lesser time only ー 10 seconds● What happens during improper / inadequate acid-etching -- bond of composite weakness ー in turn results in microleakage● If over dried with air after etch ー causes nano leakage● The time duration for complete remineralization of accidentally etched tooth- 24hrs● Read generations for DHA, recent gen etcDentine bonding● 10-15second● 5th generation – 25 Megapascal● The strength of bonding enamel 25 MP● While bonding dentin 35 MP.

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