25th Balkan Stomatological Society (BaSS) Congress, Sarajevo, Bosnia And Herzegovina, 19 - 21 May 2022, vol.25, no.35, pp.137
Aim: The aim of the study is to examine and compare the changes in the lower anterior facial soft tissue structure caused by premolar extraction orthodontic treatments in four quadrants or only in the upper two quadrants.
Materials and Methods: Thirty patients (17 females,13 males) of first premolar tooth extraction in four quadrants (Group-4X4;N=15) or only in the upper two quadrants (Group-14x24;N=15) due to severe crowding in the lower and/ or upper dentition were included in the study. At the end of the treatment, cases with class I molar and canine relationship and ideal overbite and overjet were selected. In order to evaluate the facial soft tissues, tissue thicknesses in the Subnasale (Sn), Labiale superius-(Ls), Stomion-(Sto), Labiale inferi- us-(Li), Labiomentale-(Lm), Pogonion-(Pog’) and Gnathion-(Gn’) regions were measured on lateral-cephalometric radiographs in pre-treatment and post-treatment time-points. Radiographs were evaluated using the Dolphin Imaging Software.
Results: There is no difference between the treatment duration of the two groups. In both groups, Ls and Sto increased significantly compared to pre-treatment (p<0.05). While there was no difference between the groups before the treatment, the Sto and Lm values were significantly higher in the 14x24 group at the end of the treatment (p<0.05). When the changes that occurred with the treatment between both groups were examined, Sto and Li decreased significantly in the 4x4 group, but increased in the 14x24 group (p<0.05).
Conclusion: In premolar extraction orthodontic treatments, a change in the form of thickening occurs in the soft tissue, especially in the upper lip and stomion areas.