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Change of arch form after extraction treatment on patients with Angle Ⅱ~1 malocclusion
Author(s): 
Pages: 76-79+85
Year: Issue:  1
Journal: Journal of Zhenjiang Medical College

Keyword:  Angle’Ⅱ1malocclusionarch formdigital dental model;
Abstract: Objective: To compare and analyze the changes in the arch form after extraction treatment for patients with Angle Ⅱ1malocclusion. Methods: A total of 30 patients with AngleⅡ1malocclusion were selected. Before and after tooth extraction treatment,dental cast were obtained and generated the digital dental model by 3-D scanning. Then we positioned the landmark and fitted curve of dental arch,measured dental arch width and length,analyzed the change of the dental arch form by using the computerized system for the arch form quantitative analysis. Results: After the extraction treatment for patients with Angle Ⅱ1 malocclusion: Dental arch width of maxillary lateral incisor and canines zone had significantly increased after treatment( P < 0. 01,P < 0. 05),while mandibular lateral incisor and canines zone had no obvious change; dental arch width of premolar and molar had significantly decreased both in maxillary and mandible( P <0. 001); and dental arch length of maxillary canines zone had increased( P < 0. 05),and length of molar zone had significantly decreased both in maxillary and mandible( P < 0. 001). Conclusion: After extraction treatment,dental arch of maxillary anterior had widen but narrow in the posterior,and mandibular anterior dental arch form had not narrow.
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