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我科自1988年12月以来,采用S卡及S簧先后对81例牙列拥挤患者进行矫治,均取得满意的效果。兹介绍如下: 一、S卡及S簧的形状与制作: 1.S卡:S卡分为卡头、卡体及连接体三部分,用直径0.9～1.0mm的不锈钢丝弯成。必要时可用直径1.2mm的钢丝弯制。 (1) 卡头:呈前后向S状,S曲形成的平面与粘膜表面平行,末端开口向后上方(若下颌则开口向后下方)。其水平高度随要后移牙的最大轴径的高度而定。制作时卡头两曲间的距离尽量小(该距离在图中用a表示,以下同),一般为3.5～4.5mm,S曲宽度(b)也尽量
Our department since December 1988, S card and S spring has 81 cases of dentition crowding patients, have achieved satisfactory results. Here are the introduction: First, S card and S spring shape and production: 1.S card: S card is divided into chuck, card body and connector body three parts, with a diameter of 0.9 ~ 1.0mm stainless steel wire bent into. 1.2mm diameter wire can be bent when necessary. (1) chuck: S shape before and after the S song form the plane parallel to the mucosal surface, the end of the opening to the back of the top (if the lower jaw opening backwards below). The level of height with the maximum axis of the tooth height after the change may be. Production of the first two as far as possible the distance between the chuck (the distance in the figure with a said, the same below), generally 3.5 ~ 4.5mm, S song width (b) as much as possible