IADR Abstract Archives

Regional 3D Superimposition to Assess Temporomandibular Joint Condylar Morphology

Objective:  To investigate the reliability of regional 3D registration and superimposition methods for assessment of temporomandibular joint condylar morphology across subjects and longitudinally. 

Method:  The sample consisted of Cone-Beam Computed Tomography (CBCT) scans of 36 patients. The across subject comparisons included 12 controls, mean 41.3 ±12.0 years, and 12 patients with temporomandibular joint osteoarthritis, (TMJ OA) mean 41.3 ± 14.7 years.  The individual longitudinal assessments included 12 patients with TMJ OA, mean 37.8 ±16.7 years, followed at pre-operative jaw surgery, immediately after and one-year post-operative.  Surface models of all condyles were constructed from the CBCT scans.  Two previously calibrated observers independently performed all registration methods. A landmark-based approach was used for registration of across subject condylar models, and TMJ OA versus control group differences were computed with shape analysis. A voxel-based approach used for registration of longitudinal scans calculated x, y, z degrees of freedom for translation and rotation. Two-way random intraclass correlation coefficients (ICCs) tested the inter-observer reliability.

Result:  Statistically significant differences between the control group and the OA group were consistently located on the lateral and medial poles for both observers. The inter-observer differences were ≤ 0.2 mm. For individual longitudinal comparisons, the mean inter-observer differences were ≤ 0.6mm in translation errors and 1.2° in rotation errors, with excellent reliability (ICC >0.75).

Conclusion: Condylar registration for across subjects and longitudinal assessments is reliable, and can be used to quantify subtle bony differences in the 3D condylar morphology.

AADR/CADR Annual Meeting
2014 AADR/CADR Annual Meeting (Charlotte, North Carolina)
Charlotte, North Carolina
2014
1476
  • Schilling, Juan  ( Dept. of Periodontics & Oral Medicine, University of Michigan, Ann Arbor, MI, USA )
  • Benavides, Erika  ( University of Michigan, Ann Arbor, MI, USA )
  • Gomes, Liliane De Carvalho Rosas  ( FACULDADE DE ODONTOLOGIA DE ARARAQUARA, UNESP Univ Estadual Paulista, Araraquara, , Brazil )
  • Styner, M.  ( University of North Carolina, Chapel Hill, NC, USA )
  • Boen, Vinicius  ( Department of Orthodontics and Pediatric Dentistry, University of Michigan, Ann Arbor, MI, USA )
  • Gonçalves, Joao  ( FACULDADE DE ODONTOLOGIA DE ARARAQUARA, UNESP Univ Estadual Paulista, Araraquara, , Brazil )
  • Nguyen, Tung Thanh  ( University of North Carolina, Chapel Hill, NC, USA )
  • Paniagua, Beatriz  ( University of North Carolina, Chapel Hill, NC, USA )
  • Cevidanes, Lucia H.s.  ( Department of Orthodontics and Pediatric Dentistry, University of Michigan, Ann Arbor, MI, USA )
  • Poster Session
    Facets of Maxillofacial Diagnostics III
    03/22/2014