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Spatial changes of the maxillofacial complex following maxillary protraction of human dry skull  

Chun, Youn Sic (Department of Orthodontics, Medical College, Ewha Womans University Mokdong Hospital)
Choi, Jang Woo (Department of Oral and Maxillofacial Surgery, Medicial College, Ewha Womans University)
Choi, Seung Eun (Department of Orthodontics, Medical College, Ewha Womans University)
Lee, Seong Geun (Department of Oral and Maxillofacial Surgery, Medicial College, Ewha Womans University)
Publication Information
The korean journal of orthodontics / v.32, no.6, 2002 , pp. 425-434 More about this Journal
Abstract
The purpose of this investigation was to study the spatial changes of the maxillofacial complex following maxillary protraction transmitted to the center of resistance of a dry juvenile human skull by a modified maxillary protraction appliance. Four dry juvenile human skulls (without mandible) with well aligned upper deciduous dentition and early mixed dentition were used as experimental samples. A modified protraction headgear was fabricated from a Delare's facemask, and following an alginate impression, an orthodontic resin maxillary splint was made for each dry skull. Protraction force level was maintained at approximately 1000gm per side for 6 hours. Cephalometric radiographs were taken pre- and post- protraction, and nine reference markers with 1.5 mm length of $.017\times.025$ TMA wire were placed on the right side of the skull for an accurate superimposition of serial cephalometric radiographs. The present investigation demonstrated that vertical changes associated with an anterior displacement of the maxillary complex was observed, and the most prominent effect of protraction headgear was a counterclockwise rotation of the maxilla, that is, a forward and downward tipping around the palatomaxillary region.
Keywords
Juvenile human dry skull; Modified protraction headgear; Reference marker;
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