The Bioclear DC HD matrices are for closing large black triangles where there is still a contact between the teeth, they are not for closing full diastemas where there is no contact present. They hold their shape better than traditional matrices and are more resistant to deformation. 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 Bioclear Diastema Closure matrices. Both the HD DC matrices and the traditional Diastema Closure matrices offer predictable restoration or change of a tooth’s emergence profile, have a shape which allows for injection/placement of composite into the embrasure without fear of leaving an overhanging margin, and leave the interproximal composite smooth and properly contoured due to their Mylar composition.