| http://www.w3.org/ns/prov#value | - The crystalline bracket having its base or tooth-contacting surface sputter coated with silica or other siliceous material such as a glass, has excellent affinity for silicone coupling agents such as A-174 (gamma-methacryloxypropyltrimethoxy silane), and by using such coupling agents the adhesion of the bracket to acrylic orthodontic cements is enhanced.
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