Trapezoidal expansion screw made of stainless steel with cone-shaped skeletonized holder for orthodontic appliance fabrication. Features cross holes in the body for optimal acrylic retention, travel limitation mechanism, and yellow plastic indicator with directional arrow. Designed for transverse expansion of narrow upper jaws and as activation screw for bimaxillary functional appliances, with maximum expansion of 7.5mm (4 x 1/4 turns = 0.80mm). Package contains 10 pieces with included expansion screwdriver.
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