Dentoskeletal and esthetic changes of facial profile following activator treatment of Class II, division 2 malocclusions.
Titel:
Dentoskeletal and esthetic changes of facial profile following activator treatment of Class II, division 2 malocclusions.
Auteur:
M. K. Kalavritinos
Verschenen in:
Hellenic orthodontic review
Paginering:
Jaargang 4 (2001) nr. 1 pagina's 21-36
Jaar:
2001
Inhoud:
AIM: To evaluate the dentoskeletal and soft facial tissue changes at the vertical and sagittal dimensions following activator treatment of Angle Class II, division 2 malocclusions. MATERIAL AND METHOD: Lateral cephalometric radiographs of 30 patients selected from a total sample of 300 people (Caucasians) with Angle Class II, division 2 malocclusion, who received only activator treatment in the Department of Orthodontics, Dental School, University of Vienna, during the period 1962-1982. The group of patients comprised 13 boys and 17 girls (mean age at the start of treatment: 10 years for boys and 8 years and 10 months for girls). Mean treatment time: 3.7 and 3.5 years respectively. RESULTS: Results at the end of treatment were as follows: Reduction of the angle formed by the maxillary and mandibular apical bases, reduction of the angles formed by the mandibular base to the Frankfort Horizontal and the anterior cranial base. There were also changes in the S-N-B, S-N-Pg (increase) and A-N-B (reduction) variables. Facial angle increase, resulting in reduction of mandibular retrognathism. Decrease of the angle formed by the upper occlusal and the maxillary base planes. Increase of upper incisor inclination angles, formed with the anterior cranial base plane, the maxillary base plane and the Frankfort Horizontal. On the other hand, the angle defining lower incisor position in relation to the anterior limits of the maxilla and mandible was reduced. Concerning soft tissue measurements, G-Sls/Sls-Pos and Ns-Sls/Sls-Pos were decreased. The Ns-Pos/Pos-Ls angle was also reduced, since this angle is proportionate to facial convexity. On the other hand, the Ns-Pos/Po-O angle increased. The positive relationship of S-N-B and S-N-Pg variables was statistically significant, as well as that of N-S-Gn and S-N/Go-Me variables. The negative relationship of Po-O/N-Pg and Po-O/Go-Me variables was also statistically significant. As far as the soft tissues are concerned, the positive relationships of Ns-Sls/Sls-Pos and G-Sls/Sls-Pos were statistically significant. CONCLUSIONS: Activator Treatment of Class II, division 2 malocclusion results in various skeletal and dentoalveolar changes, as well as in changes of the soft tissue profile.
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