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KMID : 0361920070370010065
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Korean Journal of Orthodontics
2007 Volume.37 No. 1 p.65 ~ p.72
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Change in arch width in extraction vs nonextraction treatment
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Jeon Ji-Yoon
Kim Su-Jung
Park Young-Guk
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Abstract
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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.
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KEYWORD
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Arch width, Extraction treatment, Nonextraction treatment
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