IADR Abstract Archives

TMJ Condilar Changes After Bimaxillary Advancement and Disc Repositioning

Objective: To assess condylar positional and/or remodeling changes after bimaxillary surgical advancement and the influence of articular disc repositioning.

Method: Thirty patients submitted to maxillo-mandibular advancement were divided in two groups: group 1 had no TMJ abnormality seen on MRI and received maxillo-mandibular advancement only. Group 2 had articular disc displacement on MRI and received bimaxillary surgery and TMJ disc repositioning simultaneously. CBCT scans were taken before surgery (T1), immediate after surgery (T2) and one year follow-up (T3). Image segmentation of the anatomic structures of interest and 3D graphic rendering were constructed using ITK-SNAP open-source software. Cranial base voxel-wise registration was used through the IMAGINE open-source software for accurate comparison of the three time point scans. Color-coded surface distances in millimeters were calculated by the CMF open-source software between T2-T1, T3-T2 and T3-T1. 

Result: Surface distance color-maps showed the location and quantified condylar displacements and/or remodeling. Both groups showed similar latero posterior and medio anterior condylar rotation after surgery and maintained this position 1 one post-surgery. Condylar surface post-surgical adaptive changes >2mm  occurred similarly in both groups, and no statistically  significant  differences  was  observed  between groups (p>0.05).

Conclusion: Patients with disc displacements treated with TMJ disc repositioning have similar condylar changes as experienced by patients with normal TMJ disc position after bimaxillary advancement.  Larger sample  size is needed to confirm our preliminary results.

IADR/LAR General Session
2012 IADR/LAR General Session (Iguaçu Falls, Brazil)
Iguaçu Falls, Brazil
Oral & Maxillofacial Surgery
  • Cunha, Luciano  ( University of Michigan, Ann Arbor, MI, USA )
  • Mello, Patrícia  ( University of Michigan, Ann Arbor, MI, USA )
  • Paniagua, Beatriz  ( University of North Carolina, Chapel Hill, NC, USA )
  • Gonçalves, João  ( Universidade Estadual Paulista ''Júlio de Mesquita Filho'', Araraquara, N/A, Brazil )
  • Cevidanes, Lucia  ( University of Michigan, Ann Arbor, MI, USA )
  • Oral Session
    Dysgnathia and Cleft Patients