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改良Haas矫治器是上颌快速扩弓矫治器中的一种。用于矫治上牙弓狭窄所造成的后牙双侧或单侧反。其机理是用螺旋扩大器，在短期内扩开腭中缝，使上牙弓增宽，以解除后牙反，其制作方法和应用体会如下1改良Haas型矫治器的制作矫治器制作：在基牙上制作带环，常用46作基牙。将带环
The modified Haas appliance is one of the rapid maxillary expansion appliances. It is used to correct bilateral or unilateral posterior teeth caused by upper arch stenosis. The mechanism is to use spiral expanders to expand the sulcus suture in a short period of time to widen the upper dental arch so as to release the posterior teeth. Its production method and application experience are as follows: (1) Manufacture of modified Haas-type orthodontic appliances. A ring is made on the teeth, and 46 are often used as abutments. With ring