What item can be used in interproximal spaces to prevent the etchant from contacting adjacent teeth during the etching procedure?

Using a Mylar strip in interproximal spaces serves a crucial purpose during the etching procedure. The Mylar strip acts as a protective barrier, effectively preventing the etchant from coming into contact with adjacent teeth. This is particularly important because unintended exposure can lead to etching of the enamel surfaces that should remain unaltered, potentially compromising the health and aesthetics of those teeth.

Additionally, the Mylar strip is flexible and can conform to the contours of the tooth, ensuring a precise fit in the interproximal area. Its clear material also allows visibility, which can be beneficial for the dental professional monitoring the procedure.

Other choices may not provide the same level of protection: cotton rolls might absorb moisture but do not fit into tight spaces effectively; dental dams can isolate an area but are typically used for a broader section and may not be suitable for precise interproximal use; and wedges are primarily for stabilization and achieving tension in restorative procedures rather than protecting adjacent teeth during etching.