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Change in arch width in extraction vs nonextraction treatment  

Jeon, Ji-Yun (Department of Orthodontics, School of Dentistry, Kyung Hee University)
Kim, Su-Jung (Department of Orthodontics, School of Dentistry, Kyung Hee University)
Kang, Seung-Goo (Department of Orthodontics, School of Dentistry, Kyung Hee University)
Park, Young-Guk (Department of Orthodontics, School of Dentistry, Kyung Hee University)
Publication Information
The korean journal of orthodontics / v.37, no.1, 2007 , pp. 65-72 More about this Journal
Abstract
Objective: This study was performed to investigate the influences of extraction and nonextraction treatment on smile esthetics by measuring dental arch width changes. Methods: Pretreatment and posttreatment study models of 30 first premolar extraction cases and 30 nonextraction cases were randomly selected to determine whether extraction treatment results in narrow dental arches, and a consequent unaesthetic smile. Arch widths were measured from the cusp tips of the canines and the first molars. Posterior arch widths were also measured at a constant arch depth derived by averaging randomly chosen nonextraction models. Results: The intercanine widths increased significantly in the extraction sample, whereas the intermolar widths decreased significantly. The arch width at a standardized arch depth was significantly wider in the extraction subjects. Conclusion: These results elucidate that constriction in arch width is not a materialized consequence of extraction treatment. It leads to postulate that an esthetically compromising effect from narrow dental arches on smile is hardly anticipated with extraction treatment.
Keywords
Arch width; Extraction treatment; Nonextraction treatment;
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