For how many seconds should dentin be etched?

Question

Quizplus · Accepted Answer

Dentin should be etched for 10 seconds.When etching both enamel and dentin as in a coronal cavity preparation,it is best to apply the acid first to the enamel for 10 seconds and then to the dentin for 10 seconds.That way,enamel will be etched for a total of 20 seconds and dentin for only 10 seconds.Etching dentin for 20 seconds or longer opens the tubules too wide and removes hydroxyapatite mineral to too great a depth.

For How Many Seconds Should Dentin Be Etched