JCO Journal of Clinical Orthodontics
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A Modified ACCO for Class II Nonextraction Treatment

VOLUME 40 : NUMBER 10 : PAGES (605-612) 2006

B. GIULIANO MAINO, MD, DDS

PAOLA ALESSANDRINI, DMD

PAOLA MURA, DMD

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This article describes a modified, second-generation Acrylic Cervical Occipital (ACCO) appliance. The first ACCO, developed by Margolis, was a modification of the Hawley retainer, with the addition of Class I finger springs mesial to the maxillary molars (). This removable appliance exerts a continuous distalizing force on the molars, with the springs' reactive forces dissipated through the acrylic button into the palate and the maxillary teeth mesia...

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