L
labdude
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These guys are for mainly lower expansion or mixed dentition. Used with a RPE half screw they are popular around here. Simple things, consist of .036 wire and .040 id tube. NiTi open coil spring is placed on the wire side, completely cover the wire, then compress and fix in place with a dead soft ligature wire. Here's a picture of 3 of them, 1 apart, 1 together, and one with the spring and lig wire in place. I deliver them off the model and sealed in a bag.