Matrices for closing large black triangles where there is still a contact between the teeth; not for closing full diastemas where there is no contact present. Like traditional Bioclear Diastema Closure matrices, Bioclear DC HD matrices are for creating new and exaggerated emergence profiles, closing gingival diastemas larger than 1mm, and for large black triangles, but are stiffer than the original matrices. Shape holds better than traditional matrices and are more resistant to deformation. Predictable restoration or change of a tooths emergence profile. Shape allows for injection/placement of composite into the embrasure without fear of leaving an overhanging margin. Mylar finish leaves the interproximal composite smooth and properly contoured.