Providing “pre-separation” will help. The preferred method is to use a Garrison FenderWedge during tooth preparation. The FenderWedge will start to separate the teeth while your are cutting the preparation. When the prep is complete, remove the FenderWedge and immediately place the matrix band. Using a traditional wedge for pre-separation will also work, but it will not protect the adjacent tooth from accidental burr contact.
Alternatively, placement of a G-Ring or 3D ring on the tooth for a few minutes prior to matrix band placement will also produce separation. After the ring has been in place for a few minutes, remove the ring and immediately place the matrix band.