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Comparison of occlusal contact areas of class I and class II molar relationships at finishing using three-dimensional digital models
- Comparison of occlusal contact areas of class I and class II molar relationships at finishing using three-dimensional digital models
- Lee, Hyejoon; Kim, Minji; Chun, Youn-Sic
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- KOREAN JOURNAL OF ORTHODONTICS
- 2234-7518; 2005-372X
- vol. 45, no. 3, pp. 113 - 120
- Tooth movement; Contact area; Molar; Orthodontic treatment; Occlusion
- KOREAN ASSOC ORTHODONTISTS
- SCIE; SCOPUS
- Objective: This study compared occlusal contact areas of ideally planned setup and accomplished final models against the initial in class I and II molar relationships at finishing. Methods: Evaluations were performed for 41 post-orthodontic treatment cases, of which 22 were clinically diagnosed as class I and the remainder were diagnosed as full cusp class II. Class I cases had four first premolars extracted, while class II cases had maxillary first premolars extraeted. Occlusal contact areas were measured using a three-dimensional scanner and RapidForm 2004. -Independent t-tests were used to validate comparison values between class I and II finishings. Repeated measures analysis of variance was used to compare initial, set up, and final models. Results: Molars from cases in the class I finishing for the set-up model showed significantly greater contact areas than those from class II finishing (p < 0.05). The final model class I finishing showed significantly larger contact areas for the second molars (p < 0.05). The first molars of the class I finishing for the final model showed a tendency to have larger contact areas than those of class II finishing, although the.difference was not statistically significant (p = 0.078). Conclusions: in set-up models, posterior occlusal contact was better in class I than in class II finishing. In final models, class I finishing tended to have larger occlusal contact areas than class II finishing.
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