Table 4.
Malocclusion improvements in Damon Q and Invisalign® group.
| Damon Q (n = 33) | Invisalign® (n = 26) | P value | ||||
|---|---|---|---|---|---|---|
| T0 | T1 | T0 | T1 | |||
| Angle classification | ||||||
| Class I | 13 | 29 | 17 | 18 | .012 | |
| Class II | 19 | 4 | 8 | 8 | ||
| Class III | 1 | 0 | 1 | 0 | ||
| Anterior overjet | ||||||
| Normal | 5 | 31 | 3 | 24 | .373 | |
| Deep overjet | I° | 6 | 2 | 8 | 2 | |
| II° | 10 | 0 | 9 | 0 | ||
| III° | 12 | 0 | 6 | 0 | ||
| Anterior overbite | ||||||
| Normal | 12 | 30 | 11 | 16 | .047 | |
| Deep overbite | I° | 8 | 2 | 8 | 7 | |
| II° | 9 | 1 | 3 | 3 | ||
| III° | 4 | 0 | 4 | 0 | ||
Damon Q achieved more improvements on molar relationship and overbite than Invisalign® (P ≤ .047). The percentage of Class I molar relationship and normal overbite in patients was increased from 39.4% to 87.8% and 36.3% to 90.9% in Damon Q group after treatment. The percentage of Class I molar relationship and normal overbite in patients was slightly increased from 65.4% to 69.2% and 42.3% to 61.5% in Invisalign® after treatment. The difference of overjet improvement was no significant between two groups after treatment. Angle classification, Overjet and Overbite were ranked orthodontic data. The calculated rank of data (T0-T1) was analyzed with Mann–Whitney U test.