| 摘要 |
<p>PURPOSE: To provide a lateral expansion of the upper and/or lower poster molars by providing an appliance which is composed of a generally U-shaped wire material with a curved part at its center and tow free rear ends, and at least one plate part is fixed to the wire material. CONSTITUTION: This bumper is formed in a generally U-shaped from a wire material 11. In the U-shaped configuration, free ends 12 and 14 form a single projection wire, and they are inserted into tubes 16 and 18 fixed to molar bands 20 and 22 held on the first permanent molar. The bumper includes two lateral side pads 24, 26 formed from an elastic plastic material which extend from a wire 11 from a posterior position close to the free end of the U-shaped frame that is secured in the buccal tubes to an anterior position so as to cover the buccal side of the molars, premolars or bicuspids and canines. The band also includes anterior pads 28 and 30 to hold the lower lip away from the lower canines to permit expansion in that area and to provide distal pressure on the anchoring molar.</p> |
