The present study hypothesized that the double keyhole looped archwire plays a positive role for the sake of translatory movement and/or controlled tipping of upper 6 anteriors, and secures anchorage control as well The purposes of the study were to evaluate the changes in lateral cephalograms during orthodontic treatment with DKHLs and to compare the skeletal & dental changes before- & after-treatment. The materials of this study were lateral cephalograms of 20 adult patients with upper dentoalveolar protrusion both in class I and in class II Division 1 malocclusion.
Lateral cephalograms were taken before and after orthodontic treatment with upper 1st bicuspid extraction and DKHLs.
The results were obtained as follows
1. There were no statistically significant differences in skeletal measurement except SNB and PTFH between
before- & after-treatment. The major changes were in dentoalveolar region.
2. After treatment, there were statistically significant decrease in dental measurement except interincisal angle. 3. Both upper & lower lip protrusion was decreased.
4. There were statistically differences in upper anterior crown horizontal & root vertical dimension(7.08 ± 2.14 mm, 2.38 ± 1.15 mm, p<0.01).
5, There were statistically differences in upper posterior dental(both crown & root) horizontal dimension(2.48 ± 0.99 mm, 2.05 ± 0.91 sm, p<0.01).
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