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KMID : 0358920080350020297
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Journal of the Korean Academy of Pedodontics
2008 Volume.35 No. 2 p.297 ~ p.304
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THREE-DIMENSIONAL SPACE CHANGES AFTER PREMATURE LOSS OF THE PRIMARY FIRST MOLAR: A LONGITUDINAL STUDY
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Kim Ji-Yeon
Park Ki-Tae
Jeong Da-Woon
Quark So-Youn
You Sung-Eun
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Abstract
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The purpose of this study was to evaluate a 3-Dimensional laser scanner for the space analysis after loss of a primary first molar. Six children with premature loss of a primary first molar were examined using study models taken before and after the extraction. The results were as follows: 1. There was no change in primary molar space after the extraction of a maxillary primary first molar However, 2 out of 3 children experienced primary molar space loss in extraction side of a mandibular primary first molar. 2. Arch width and arch perimeter showed no difference between initial and final model. 3. All primary canines did not show any changes in inclination. Maxillary primary second molars had similar changes in both extraction and control side. However, 2 out of 3 mandibular primary second molars in extraction side showed more lingual tipping compared to control side. Mandibular permanent first molars tipped more lingually in extraction side. 4. In angulation, primary canines showed nothing of significance. Mandibular primary second molars tipped more mesially in extraction side than in control side. Maxillary permanent first molars have increased distal angulation after extraction of primary first molars in both side.
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KEYWORD
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Premature loss of a primary first molar, Three-dimensional space changes, Space loss
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