Dynamax appliance 的上顎為活動式的 ,下顎可以是活動也可以採用bands+lingual arch的方法,固定式的方法較適用在mixed dentition的末期,同時固定式的方式也可以當做 space maintainer來保持leeway space,也較不須要病人的合作
上顎的裝置是後牙段有兩邊彎制adams clasp,前牙區則是一個modified 的torquing spring,在較小且是乳牙階段的小朋友可以用類似crozat appliance的鉤
上顎擴大是靠palatal spring,這可以避免當下前牙段往前長的過程當中,產生後牙段的crossbite
A. Vertical springs fit into space between cheeks and tongue, leaving buccal segments free to erupt without interference. B. Vertical springs remain in contact with mandibular "shoulders" throughout range of opening to
maintain protrusive position of mandible
Acrylic thickness of 1mm over posterior teeth unlocks occlusion and allows application of heavy extraoral force to control maxillary development
Anterior torquing spring controls angulation of maxillary incisors and prevents tipping
Capping lower incisors improves retention and controls tipping.
"Shoulders" in lingual acrylic of removable lower component.
Fixed lingual arch cemented to bands on lower
first molars, with "shoulders" bent into wire mesial to bands.
  The Dynamax system can be used to correct the skeletal Class II malocclusion efficiently and 這是針對混合齒列期暴牙的案例的一種處理方法 (文章來源:http://www.jco-online.com/archive/article-view.aspx?year=2003&month=05&articlenum=268) |
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