Soft tissue changes evaluated in Class II, division 1 cases, after orthodontic treatment

Júlio César de Oliveira BRANT, Vânia Célia Vieira de SIQUEIRA

Aim: this study compared the profile changes in patients with Class II, division 1, malocclusion who were treated with similar appliances, but without any extractions. Methods: thirty white female patients, dolicofacials, were treated with fixed appliances for their Class II, division 1, malocclusions, 15 subjects had four first premolar extractions and 15 were treated with nonextractions. The orthodontic records included lateral cephalograms taken before and after orthodontic treatment. Thirteen soft tissue linear and angular measurements were derived and included: SN-P, SN-Sts, Ls-SIS, Ls-SN-Pog’, Sts-Sti, Li-SII, Li-SNPog’, B’-SNPog’, SN.Go.Gn, G’.SN.Pog’, Col.SN.Ls, SN.A’.Ls e Li.B’.Pog’. Results: the results indicate a significantly decrease in the duration of the treatment on the nonextraction group (p < 0,025), 12 months less on the average. There was a significantly greater increase in the nasolabial angle (Col.SN.Ls), mandibular sulcus angle (Li.B’.Pog’) and the facial profile angle (G’.SN.Pog’) in both groups and a significantly decrease in Ls-SNPog’ and the interlabial gap (Sts-Sti). The extraction group tends to have an increase of B’-SNPog’ and a decrease of Li-SN-Pog’. Conclusions: the average soft tissue measurement for both extractions and nonextractions groups were close to the normal standards after the treatment with a significant better position of the lower lip, a decrease of the interlabial gap and an increase of the facial profile angle.

Keywords: Orthodontics. Soft facial profile. Class II.

Sunday, December 29, 2024 00:21