As shown in the case photos below, the patient presented with two large amalgams on #18 and #19 that required crowns. Normally, if you’re going to build these teeth up, you would remove the entire amalgams, put matrix bands around the teeth, and then fill the teeth with core material. However, instead of fully removing the amalgam, simply remove only the center portion while leaving the interproximal of the amalgams to serve as a matrix prior to forming the core.
As seen in Photo 3, Cosmedent’s CosmeCORE™Blue was used so that when the tooth is prepped, you can easily distinguish the core material from the tooth. If it happened to be an all-ceramic crown, you could use the A2 or White CosmeCORE, but when you’re working on a metal or gold ceramic crown, Blue is the optimal choice. Notice that the amalgams are still in place and holding the core material. To achieve final preparation (Photo 4) for temporary crown placements, simply remove the remaining amalgam, leaving the core material in place.
This method will ultimately save you time because you no longer need to use a matrix band around the teeth. Additionally, you avoid the risk of any gingival bleeding caused by the matrix bands.