Objective To evaluate the clinical application of OPA - K straight wire appliance.

目的了解 OPAK 滑动直丝弓矫治器的临床应用特点.

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Objective : To compare the clinical effect of directly bonded and buccal tube in straight wire appliance.

目的: 比较直接粘结颊面管与带环颊面管在直丝弓矫治技术中的临床应用.

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They were all treated with straight wire appliance and helical spring to expand clearance.

均采用直丝弓矫治器矫治,应用螺旋推簧扩展间隙及上颌前方牵引.

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