3M Express STD Putty is an excellent all-purpose impression putty that mixes easily without streaking. 3M ESPE impression material manipulates nicely, and provides a firm set. Express STD Putty is an impression material which has excellent features to be used in the field of dentistry in several clinical and lab procedures. The best part is that the base and catalyst are available in different jars which makes them stay fresh and can be used whenever required. Many people ask how long does it take to do a dental impression? You can mix the two components easily and get a mold within one to two minutes. The good consistency makes it easy for the dentists as well as lab technicians to use in day to day impression techniques. Dental impression putty is used in the crowns, bridge, onlay and inlay procedures. The full denture and partial denture impression can also be taken with the help of the Express STD Putty and the impressions can then be used successfully in the dental procedures. Complete kit, regular set.