A thin, flexible, gently angled boomerang shaped matrix band (2) having an extrusion window (6) located within the medial portion of the band's (2) inferior and superior borders. Located inferiorly, a gingival separation notch, (10) is medially aligned with and terminates a measured distance below the extrusion window (6). Located superiorly, a semicircular bridge (8) is medially aligned with both the extrusion window (6) and the gingival separation notch (10).