Evaluation of Lingual Arch form among Angle Class I, Class Iiand Class III Malocclusions in Chinese Orthodontic Patients

page no: 30/37 www.ommegaonline.org Vol:4 Issue: 2 Abstract: Introduction: The aim of this study was to analyze and compare the dental lingual arch widths and lengths, alveolar arch within patients with Angle’s Class I (ACI), Class IIdivision1 (ACII) and Class III (ACIII) malocclusions in Chinese patients. Methods: This study was performed using measurements on ninety dental casts with ACI (age: 22.2 ± 3.6), ACII (age: 23.0 ± 3.8), and ACIII (age: 22.0 ± 2.8) malocclusion subjects. Two-way ANOVA post-hoc and nonparametric tests were applied for comparisons in groups and genders. Results: Maxillary canineand premolar alveolar widths and all maxillary lingual lengths were significantly narrower in ACIII (p < 0.05). The mandibular intercanine andintermolar widths were wider and the maxillary intermolar width measurement was larger in ACIII (p < 0.05). Male’s palate height in ACIII was greater than ACII (p < 0.05). Gender differences were also significant in these measurements. Conclusions: Our data showed undergrowth of the maxilla and overgrowth of the mandible and incisor inclined lingual in ACIII; mandibular growth retrusion and maxillary incisor inclined in ACII. Alveolar width was greater in males than females.