Terminal teeth are tough to band and keep rubber dam isolation. So we came up with an alternative- the custom resin matrix. Using green opaldam we make a custom matrix to pack amalgam with or place a controlled field resin. Often we use the technique subgingivaly on bone. For first iterations we used white Opaldam but found it hard to discern on bone. The green is easier to see and thus remove. Waiting 5 minutes or so for the amalgam to harden makes the green matrix easier to remove