Abstract
Introduction: Tooth extraction to provide sufficient space, or camouflage of underlying skeletal problems is quite common in orthodontics. The present study evaluated soft tissue changes after upper first premolars extraction in class ΙΙ div 1 patients. Material and Methods: 20 cases (15 females, 5 males), with a mean age of 17.8±2.9 years with class ΙΙ div1 malocclusion and normal vertical height, who needed upper first premolars extraction were selected. Pre- and post-treatment lateral cephalometric radiographs were digitized. Image analysis was conducted by View Box 3.1.1 software. Paired t-test was used for comparison of pre- and post-treatment results. Results: The relationship of upper and lower lip to E-line and B-line had significant reduction. Dental variables of U1-NA(mm), U1-NA(°), overjet and overbite showed statistically significant reduction. Interincisal angle had significant increase. There were no significant difference in lower incisor variables and skeletal variables like SN-GoGn and FMA. Conclusions: Extraction of upper first premolars in patients with class ΙΙ div 1 malocclusion resulted in normal position of lips as presented by Holdaway, Legan and Ricketts which play a role in aesthetic profile. However, the amount of lip retraction was different from patient to patient. Key words:Soft tissue, fixed orthodontic treatment, class ΙΙ div 1, upper first premolar extraction.
Highlights
Tooth extraction to provide sufficient space, or camouflage of underlying skeletal problems is quite common in orthodontics
Lower lip to H-line and soft tissue facial angle decreased in all groups but not statistically significant
Growth may increase vertical dimension and loss of vertical height dimension due to treatment by extraction of premolars can be masked with growth changes [23,24]
Summary
Tooth extraction to provide sufficient space, or camouflage of underlying skeletal problems is quite common in orthodontics. The present study evaluated soft tissue changes after upper first premolars extraction in class ΙΙ div 1 patients. Material and Methods: 20 cases (15 females, 5 males), with a mean age of 17.8±2.9 years with class ΙΙ div malocclusion and normal vertical height, who needed upper first premolars extraction were selected. Results: The relationship of upper and lower lip to E-line and B-line had significant reduction. Conclusions: Extraction of upper first premolars in patients with class ΙΙ div 1 malocclusion resulted in normal position of lips as presented by Holdaway, Legan and Ricketts which play a role in aesthetic profile. One of the main concerns of orthodontic treatment is soft tissue changes after extraction of premolars and in the previous years, non extraction treatments and molar distalization have been popularized [1,2]. In cases with arch size/tooth size discrepancy of 5-9mm, non extraction and extraction treatment is possible and e539
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