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    The T-Rex Appliance offers a two-phase approach: arch expansion followed by molar distalization. It employs a pre-activated .032 TMA wire, an expansion screw, and premolar rests. During expansion, a wire embedded in acrylic halts spring activation. Once arch development concludes, clinicians cut this wire, activating springs for molar distalization. An adjustment loop can assist molar rotation, and lingual sheaths, provided by the lab, are spot-welded onto the band.