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KMID : 1149920120010010010
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Korean Journal of Limgual Orthodontics
2012 Volume.1 No. 1 p.10 ~ p.18
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The Straight Lingual Archform in Set-up Model of the 1st Premolars Extraction Case
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Chang Bong-Kyu
Kyung Hee-Moon
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Abstract
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Purpose: Th is study was designed to obtain the straight lingual archform in order to provide the fundamental data for preformed straight lingual arch wires and brackets development.
Methods: Set-up models of 35 patients were selected and scanned. 4 anterior Fujita lingual brackets were aligned with a proper circular arc and the others in a straight line using computer program. Diameter of anterior arc and length and width of posterior straight line were measured and standardized.
Results: In maxilla, diameter of anterior arcs ranged 30-46 mm, in mandible, 26-42 mm. Anterior arcs were divided into 3 groups (large, medium, small) and standardized. Standardized maxillary and mandibular anterior diameters of arcs were same, however maxillary arch width was a little larger than mandibular arch width. Th e straight lingual archform was obtained with minimal distance between lingual surface of the tooth and brackets.
Conclusion: Th is study will be helpful in developing preformed straight lingual archwires and brackets.
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KEYWORD
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Set-up model, Straight lingual archform
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