IADR Abstract Archives

Three-Dimensional Analysis of Soft Tissue Changes After Orthognathic Surgery

Objectives: The aim of this retrospective study is the evaluation of soft tissues changes by 3-D facial scans after orthognathic surgery.
Methods: A total of 59 patients (30 F, 29 M) were recruited in this study (mean age 27.7±7.2). Among these 10 were skeletal Class II patients (mean age of 23.1±4.1), and 49 were skeletal Class III patients (mean age of 26.2±8.2). All patients underwent orthognathic surgery and had a 3D photo taken at two time points: at T0, preoperative and at T1, between three months and one year after the surgery; the images were registered and analyzed using 3dMDVultus Software. A total of 23 soft landmarks were identified and 25 parameters were constructed for the analysis of soft tissues. The paired t-test was used to compare the results of the group at T0 and T1. The level of significance was set at p < 0.05.
Results: In the Class II sample, statistically significant changes were shown by the angles LSNLI (-1.0°±1.3°), SSNSL (-1.3°±1.6°), SLNPG (-0.7°±0.7°), the submental angle (12.9°±13.2°) and the UPPER LIP THICKNESS (-1.4mm±1.8mm). In the Class III sample statistically significant changes were shown by the angles LSNLI (0.9°±1.8°), LINSN (0.8°±1.9°), LINPG (-0.4°±0.9), SSNSL (2.0°±1.7°), SNNSL (1.4°±1.9°), SNNSS (-0.7°±1.0°), UPPER LIP POSITION (-1.6°±1.7°) that highlight the sagittal correction of the malocclusion and a decrease is observed of LOWER LIP HEIGHT (-1.7mm±2.8mm). The profile became more convex (FACIAL CONVEXITY -2.1°±3.5°). The nose width presents a statistically significant increase (Nose Width 2.7°±2.3°).
Conclusions: In Class II patients there is a greater effect on the mandibular level characterized by the advancement of the SL point with opening of the SUBMENTAL ANGLE. In Class III patients there is a normalization of sagittal disharmony, with an increase in facial convexity.

2021 Continental European and Scandinavian Divisions Meeting (Brussels, Belgium, Hybrid)
Brussels, Belgium, Hybrid
2021
0291
Orthodontics Research
  • Rongo, Roberto  ( University of Naples , Naples , Italy )
  • Trotta, Immacolata  ( University of Naples , Naples , Italy )
  • Bucci, Rosaria  ( University of Naples , Naples , Italy )
  • Seguino, Alessandra  ( University of Naples , Naples , Italy )
  • Michelotti, Ambra  ( University of Naples , Naples , Italy )
  • D'antò, Vincenzo  ( University of Naples , Naples , Italy )
  • NONE
    Poster Session ALL VIRTUAL
    Orthodontics