IADR Abstract Archives

Chin Volume Asymmetry Score Changes After Class III Orthognathic Surgery

Objectives: The objective of this study was to investigate the asymmetric changes in chin volume over 12 months after orthognathic surgery using three- dimensional stereophotogrammetry. The analysis of soft tissues over time was conducted using 101 healthy Caucasian patients with a skeletal Class III malocclusion (age range 19–53 years, mean age 28.6 years).
Methods: Three-dimensional facial images were acquired using the 3dMDtrio (3dMD, Atlanta, GA) stereophotogrammetric system and recorded: before surgery (T0), 6 months (T1) and 12 months (T2) after surgery. The 21 anthropometric landmarks were digitally marked on each 3-D facial surface and evaluated at 3 time points. The chin area asymmetry was assessed and classified as: 0–2 mm (mild); 2–5 mm (moderate); > 5 mm (severe). The Chin Volume Asymmetry score (CVAS) was used. All patients were divided in two groups depending on the type of surgery: single jaw (LeFort I-21 (20.8%)) and both jaw (bimaxillary- 79 (78.2%)) surgery group.
Results: The Chin Volume Asymmetry score showed statistically significant difference between T0 (median 1.11 mm; IQR (1.04; 1.19)) and T1 and T2 (median 1.08 mm for both; IQR (1.04; 1.13); P < 0.001), but not difference between T1 and T2 (P> 0.05). No differences in the CVAS was found between both surgical groups at any time point (p>0.05). With the CVAS, the right side of the face was larger before surgery (51.48% of cases); while in 19.8% of cases, the sides changed after surgery, but the right side remained dominant. A statistically significant difference was observed in moderate asymmetry group between T0 (median: 1.16) and T1 (median: 1.07) (p<0.01).
Conclusions: It is concluded that with the CVAS the most statistically significant changes were found in the first 6 months after the surgery. Furthermore, there was no statistically significant change in chin asymmetry 12 months after surgery.

2023 Continental European and Scandinavian Divisions Meetings (Rhodes, Greece)
Rhodes, Greece
Oral and Maxillofacial Surgery
  • Nike, Edmonda  ( Institute of Stomatology,RSU , Riga , Latvia )
  • Radzins, Oskars  ( Baltic Biomaterials Centre of Excellence , Riga , Latvia )
  • Pirttiniemi, Pertti  ( University of Oulu , Oulu , Finland )
  • Vuollo, Ville  ( Research Unit of Oral Health Sciences , Oulu , France )
  • Slaidina, Anda  ( Institute of Stomatology, RSU , Riga , Latvia )
  • Abeltins, Andris  ( Institute of Stomatology,RSU , Riga , Latvia )
  • NONE
    Poster Session
    Poster Session Day 1
    Thursday, 09/21/2023 , 12:00PM - 01:00PM