Which of the following restorative techniques was first introduced in 1955?

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The acid-etch technique was introduced in 1955.Cohesive gold foil,which could be condensed directly into the cavity preparation,was introduced in 1855.In 1907,Dr.William Taggart demonstrated a casting method to produce gold inlays.Synthetic resins were introduced in 1932;these resins soon replaced rubber as the denture base of choice.Around this time,synthetic resins also became a popular tooth-colored alternative,and,together with the introduction of the acid-etch technique,they have evolved into composite resin,one of the most popular restorative materials.

Which of the Following Restorative Techniques Was First Introduced in 1955