| 摘要 |
The present invention relates to an improvement to an orthodontic appliance comprising of a bracket ( 10 ), which further includes a base portion ( 12 ), a body section ( 24 ) extending from the base portion ( 12 ), and wherein said improved orthodontic appliance comprises of a plurality of edges ( 14, 16, 18, 20 ) and a set of tie wings ( 22 a, 22 b), and wherein said orthodontic appliance also includes an archwire slot ( 26 ) and a vertical slot ( 27 ) and wherein a plurality of channels ( 36 ) is provided therein on the bottom surface of the orthodontic appliance and wherein a mesial tie wing undercut ( 32 ) and a distal tie wing undercut ( 34 ) are provided respectively to form a continuous undercut channels with an incisal and a gingival tie wing undercuts ( 40, 38 ).
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