Cantilevered Maxillary Wraparound Retainer
This maxillary wraparound retainer (Fig. 1) is idealfor a well-finished case where the secondmolars are included in the final occlusion. An.036" wire is used for both the cantilever arm andthe labial bow, which is contoured around thefirst and second molars and in the embrasures. Itis not necessary to engage any of the tooth undercuts.
The cantilever arm begins at the middle ofthe first bicuspid, where it is soldered to the labialbow. To provide adequate support and stability,it should lie about 3mm superior and parallelto the labial bow until it reaches the secondmolar, where it again contacts the labial bow. Thecantilever arm should be adjacent to, but nottouching, the gingiva, and should not impinge onthe buccal mucosa.
If the labial bow tends to slide due to theinclination or contour of the incisors, it can beadjusted up or down by using a three-prong plierto place a slight bend in the middle of the cantileverarm. In the rare cases where retention isinadequate, the labial bow can be adjusted at theembrasures with a three-prong plier. Acrylic canbe added in the anterior region if desired.
With this design, there are no occlusal orinterproximal interferences from support orretention wires. The patient's occlusion can settleeasily, especially if the acrylic is relieved on thepalatal surfaces of the posterior teeth. Wirebreakage has been rare.