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Spatial changes of the upper dentition following en-masse space closure: A comparison between first and second premolar extraction  

Kim, Hui-Jung (Department of Dentistry, Graduate School of Medicine, Ewha Womans University)
Chun, Youn-Sic (Department of Dentistry, Graduate School of Medicine, Ewha Womans University)
Jung, Sang-Hyuk (Department of Preventive Medicine, College of Medicine, Ewha Womans University)
Publication Information
The korean journal of orthodontics / v.35, no.5, 2005 , pp. 371-380 More about this Journal
Abstract
The purpose of this experimental study was to evaluate aㅜd compare maxillary arch dimensional and positional changes between first and second premolar extraction groups. The Calorific Machine was used to illustrate tooth movement in three dimensions. The experimental teeth except the first or second premolars were embedded in artifical alveolar bone. The extraction space was closed using arch wires with bull loops into which 15 degree gable bends were placed. Before and after space closure, radiographs were taken in the sagittal and occlusal directions using occlusal films. The results showed greater mean maxillary incisor retraction and less anchorage loss in the maxillary first premolar extraction group than in the maxillary second premolar extraction group. Mesiopalatal rotation of anchor teeth was greater after extraction of a maxillary second premolar than a maxillary first premolar (P<.001).
Keywords
Premolar extraction; Space closure; Bull loop; Rotation;
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