• Suhatcha Maetevorakul D.D.S.
• Smorntree Viteporn D.D.S., MD.Sc., Cert in Craniofacial Ortho

Objective To compare the soft tissue profile changes of Class II Division 1 patients who were treated
by different orthodontic modalities.

Materials and Methods The subjects comprised 104 Thai growing patients who presented Class II
Division 1 malocclusion and were treated by different orthodontic modalities. Group I: 30 patients
were treated with cervical headgear. Group II: 30 patients were treated with Class II traction. Group III:
44 patients were treated as an extraction of the four first premolars. The profile changes were
scrutinized from lateral cephalograms before and after treatments by means of the X-Y coordinate
system. Significant differences of the profile changes within and between groups were tested by paired
t-test and one-way ANOVA at 0.05 significant level, respectively.

Results In the headgear group, the upper lip moved backward and downward, the lower lip only
moved downward and the chin moved forward and downward. In the Class II traction group, the upper
lip moved downward, the lower lip moved forward and downward and the chin moved downward.
In the extraction group, the upper and lower lips moved backward and downward whereas the chin
moved forward and downward. There were significant differences among the three groups at the upper
and lower lips. The headgear and extraction groups had more upper lip retrusion than that of the Class
II traction group. The extraction group had lower lip retrusion, whereas the Class II traction group had
lower lip protrusion.

Conclusion Different treatment modalities as well as facial growth produce different facial profile
responses in Class II Division 1 growing patients.

(CU Dent J. 2015;38(Suppl):53-66)