我科自１９９２年开始采用双圆管托槽矫治上恒中切牙间隙７０余例，均收到良好效果．常规酸蚀，用京津釉质粘合剂将双圆管托槽贴于两中切牙上１／３处，若中线偏移的中切牙，侧切牙已萌出，可在一侧侧切牙也贴一托槽，用结扎丝将０．５ｍｍ不锈钢丝固定于双圆管托槽中间，... Since 1992, our department has adopted double round tube brackets to treat more than 70 cases of constant incisors' space, all of which have received good results. Conventional etching, the Beijing-Tianjin enamel adhesive double round brackets affixed to the two on the 1/3, if the midline offset incisors, lateral incisors have erupted, you can also side of the incisors also Paste a bracket, with a wire tie 0.5mm stainless steel wire fixed in the middle of double-tube brackets, ...