"3D rings are the real topic of Garrison’s systems. The “v” shape of the ring that fits in the interproximal area allows a good fitting between the cavity margins and the matrix in the buccal and palatal walls. This results in an easier positioning of the composite masses close to the cavity margins and also the final remodeling usually necessary at the time of removal of the matrix will be very minimal. The rings also permit a divergence of the interproximal dental elements, and this causes a great point of contact. Garrison systems make Class II restorations simpler and more predictable and also reduce the operating time of the finishes when the matrix is taken off."