PERUBAHAN VERTIKAL WAJAH SETELAH 6 BULAN PERAWATAN ORTODONTIK CEKAT (ANALISIS STEINER STUDI SEFALOMETRI LATERAL)

Background: Fixed orthodontics can treat complex malocclusion cases such as intrusion, extrusion, rotation, and tipping. The use of fixed orthodontic appliances can change the vertical face due to the movement of the molar teeth. Investigations are needed to assess the outcome of treatment, one of which is lateral cephalometric radiography. Analysis of the vertical changes of the face was carried out by looking at changes in the MP-SN angle. The purpose of this study was to determine whether there were differences in the vertical face before and after 6 months of fixed orthodontic treatment using the Steiner method. Methods: This study used a case control design by comparing groups before and after 6 months of fixed orthodontic treatment. the sample in this study amounted to 5 people. The vertical measurement of the face is carried out at the MP-SN angle, namely the angle formed from the MP (Mandibular Plane – Go-Gn) line and the SN (Sella-Nasion) line. Data analysis was carried out using the SPSS version 25 program, then the Saphiro Wilk normality test and Paired T-test were performed. Result: There was no significant change in the study (p>0.05) so that H0 was accepted and H1 was rejected. The average change is 1.2º. Of the 5 patients, 4 patients (80%) experienced a reduction in the MP-SN angle, while 1 patient (20%) experienced an increase in the MP-SN angle. Conclusion: There was no significant change in facial vertical changes before and after 6 months of fixed orthodontic treatment at RSGM UMY. The decrease in the MP-SN angle is caused by the intrusion of the molars which causes a counterclockwise rotation of the mandible. The increase in the MP-SN angle is due to the distalization of the molars which results in a clockwise rotation of the mandible