@article{article_1702714, title={Evaluation of the Effect of Premolar Extraction on Hard and Soft Tissue Profile Changes}, journal={Süleyman Demirel Üniversitesi Sağlık Bilimleri Dergisi}, volume={16}, pages={413–421}, year={2025}, DOI={10.22312/sdusbed.1702714}, author={Albayrak, Elif and Arslan, Aybüke Dilara and Şenışık, Neslihan}, keywords={Estetik, Premolar çekimi, Profil değişimi}, abstract={Objectıve: To evaluate the hard and soft tissue profile changes in pre- and post-treatment cephalometric films in patients over 16 years of age who underwent maxillary two or four premolar tooth extraction. Materials and Methods: Cephalometric radiographs of 68 patients who completed orthodontic treatment were analyzed. Measurements were made on the records of 40 patients who had four first premolars extracted and 28 patients who had two upper premolars extracted. Pre-treatment (T1) and post-treatment (T2) values were compared. The Shapiro-Wilk test was used to evaluate the normal distribution of the data, and paired t-test and independent t-test were used for pre-treatment and post-treatment comparisons. The significance level was taken as p <0.05. Results: In the four premolar extraction group, the distances of the upper and lower incisors to the E-plane and lip thickness and lip length increased numerically but were not found to be statistically significant (p>0.05). The lower lip thickness increased in the two premolar extraction group (p <0.05). In the independent comparison of the parameters between the groups, there was no difference in the nasolabial angle between the two groups at T1, but it increased statistically at T2. The SNA angle decreased numerically in the four premolar extraction group, but increased in the two premolar extraction group. The nasolabial angle increased significantly in both groups. Conclusion: In both extraction groups, minimal profile change was achieved with lip retraction resulting from incisor retraction. Extraction treatment can be considered in cases where the lips are desired to move backward.}, number={3}, publisher={Süleyman Demirel Üniversitesi}