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Regional 3D Superimposition to Assess Temporomandibular Joint Condylar Morphology

Institution:
1Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, USA.
2Department of Orthodontics and Pediatric Dentistry, Araraquara Dental School, Sao Paulo, Brazil.
3Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, NC, USA.
4Department of Psychiatry, School of Medicine, University of North Carolina, Chapel Hill, NC, USA.
5Department of Orthodontics and Pediatric Dentistry, University of Michigan, Ann Arbor, MI, USA.
Publication Date:
Jan-2014
Journal:
Dentomaxillofac Radiol
Volume Number:
43
Issue Number:
1
Pages:
20130273
Citation:
Dentomaxillofac Radiol. 2014 Jan;43(1):20130273.
PubMed ID:
24170802
PMCID:
PMC3887483
Keywords:
condyle, measurements, morphology, registration, reliability, temporomandibular joint
Appears in Collections:
NA-MIC, SLICER
Sponsors:
R01 DE024450/DE/NIDCR NIH HHS/United States
U54 EB005149/EB/NIBIB NIH HHS/United States
Generated Citation:
Schilling J., Gomes L.R., Benavides E., Nguyen T.T., Paniagua B., Styner M., Boen V., Gonçalves J.R., Cevidanes L.H. Regional 3D Superimposition to Assess Temporomandibular Joint Condylar Morphology. Dentomaxillofac Radiol. 2014 Jan;43(1):20130273. PMID: 24170802. PMCID: PMC3887483.
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To investigate the reliability of regional three-dimensional registration and superimposition methods for assessment of temporomandibular joint condylar morphology across subjects and longitudinally. METHODS: The sample consisted of cone beam CT scans of 36 patients. The across-subject comparisons included 12 controls, mean age 41.3 ± 12.0 years, and 12 patients with temporomandibular joint osteoarthritis, mean age 41.3 ± 14.7 years. The individual longitudinal assessments included 12 patients with temporomandibular joint osteoarthritis, mean age 37.8 ± 16.7 years, followed up at pre-operative jaw surgery, immediately after and one-year post-operative. Surface models of all condyles were constructed from the cone beam CT scans. Two previously calibrated observers independently performed all registration methods. A landmark-based approach was used for the registration of across-subject condylar models, and temporomandibular joint osteoarthritis vs control group differences were computed with shape analysis. A voxel-based approach was used for registration of longitudinal scans calculated x, y, z degrees of freedom for translation and rotation. Two-way random intraclass correlation coefficients tested the interobserver reliability. RESULTS: Statistically significant differences between the control group and the osteoarthritis group were consistently located on the lateral and medial poles for both observers. The interobserver differences were ≤0.2 mm. For individual longitudinal comparisons, the mean interobserver differences were ≤0.6 mm in translation errors and 1.2° in rotation errors, with excellent reliability (intraclass correlation coefficient >0.75). CONCLUSIONS: Condylar registration for across-subjects and longitudinal assessments is reliable and can be used to quantify subtle bony differences in the three-dimensional condylar morphology.

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