Dent-skeletal Changes During Correction of Deep Overbite by Intrusion Arch

Objectives: To confirm the effectiveness of segmental intrusion arch on treating deep overbite with Class II malocclusion, by investigating the dent-skeletal changes between pretreatment(T1) and post-treatment stage(T2). Methods: 16 Class II and deep overbite cases(10 females and 6 males), adult patients,with average ages of 25.8 years were selected. The camouflage treatment objective was decided. The deep overbite was corrected into normal overbite of 2 mm. The relative parameters comparison between pre-treatment (T1) and post-treatment stage(T2) were calculated statistically, by t-test. Results: The deep overbite was treated successfully into 2 mm, and the amount of corrected overbite is 2.9mm, p<0.01, indicating significant difference. The upper incisors and lower incisors were intruded by 1.4mm,and 1.5mm respectively(p<0.001), remaining the stable position in anterior-posterior direction. The occlusion plane rotated clock-wise about 2¨¬(P<0.01). Mandibular plane remains nealy the same as in pretreatment stage. Conclusion: The segmental intrusion arch, Burstone mechanics is an effective method to correct deep overbite, and class II adult cases.