Comparison of occlusal contact areas of class I and class II molar relationships at finishing using three-dimensional digital models.
10.4041/kjod.2015.45.3.113
- Author:
Hyejoon LEE
1
;
Minji KIM
;
Youn Sic CHUN
Author Information
1. Department of Dentistry, Graduate School of Medicine, Ewha Womans University, Seoul, Korea. Yschun@ewha.ac.kr
- Publication Type:Original Article
- Keywords:
Tooth movement;
Contact area;
Molar;
Orthodontic treatment;
Occlusion
- MeSH:
Bicuspid;
Molar*;
Tooth Movement
- From:The Korean Journal of Orthodontics
2015;45(3):113-120
- CountryRepublic of Korea
- Language:English
-
Abstract:
OBJECTIVE: This study compared occlusal contact areas of ideally planned set-up 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 extracted. 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.
