New classification of lingual arch form in normal occlusion using three dimensional virtual models
박경희, Bayome Mohamed, 박재현, Lee Joeng-Won, 백승학, 국윤아,
소속 상세정보
박경희 ( Park Kyung-Hee ) - Catholic University Graduate School of Clinical Dental Science
( Bayome Mohamed ) - Catholic University College of Medicine
박재현 ( Park Jae-Hyun ) - Kyung Hee University Graduate School of Dentistry
( Lee Joeng-Won ) - Private practice
백승학 ( Baek Seung-Hak ) - Seoul National University School of Dentistry Department of Orthodontics
국윤아 ( Kook Yoon-Ah ) - Catholic University Seoul St. Mary’s Hospital Department of Orthodontics
KMID : 0361920150450020074
Abstract
Objective: The purposes of this study were 1) to classify lingual dental arch form types based on the lingual bracket points and 2) to provide a new lingual arch form template based on this classification for clinical application through the analysis of three-dimensional virtual models of normal occlusion sample.
Methods: Maxillary and mandibular casts of 115 young adults with normal occlusion were scanned in their occluded positions and lingual bracket points were digitized on the virtual models by using Rapidform 2006 software. Sixty-eight cases (dataset 1) were used in K-means cluster analysis to classify arch forms with intercanine, interpremolar and intermolar widths and width/ depth ratios as determinants. The best-fit curves of the mean arch forms were generated. The remaining cases (dataset 2) were mapped into the obtained clusters and a multivariate test was performed to assess the differences between the clusters.
Results: Four-cluster classification demonstrated maximum intercluster distance. Wide, narrow, tapering, and ovoid types were described according to the intercanine and intermolar widths and their best-fit curves were depicted. No significant differences in arch depths existed among the clusters. Strong to moderate correlations were found between maxillary and mandibular arch widths.
Conclusions: Lingual arch forms have been classified into 4 types based on their anterior and posterior dimensions. A template of the 4 arch forms has been depicted. Three-dimensional analysis of the lingual bracket points provides more accurate identification of arch form and, consequently, archwire selection.
키워드
Lingual arch form; Lingual arch dimensions; Cluster analysis; Normal occlusion; Three-dimensional virtual models
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