| 摘要 |
An orthodontic bracket has an archwire slot adapted to receive an archwire therein and comprises a core and an overmolded polymeric cover that covers the core. The polymer of the overmolded polymeric cover is cross-linked. The thickness and the cross-linked density of the cover are sufficient to limit chemicals found in an oral environment from passing through the cover during treatment. In an embodiment, the core comprises a polycarbonate and the cover comprises a polyurethane. A method of making an orthodontic bracket comprises providing a core and overmolding a polymeric cover over at least a portion of the core and cross-linking the polymer of the polymeric cover. In another embodiment, a method of molding an orthodontic bracket comprises injecting a first polymer into a mold cavity to form a polymeric core and injecting a second polymer into the mold cavity to form an overmolded polymeric cover over the core.
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