Temporomandibular Joint Condylar/Fossa Positional Changes Post Herbst And Xbow Treatments In Adolescents Assessed Through CBCT Imaging

• Author / Creator

  Aldajani, Tareq

• Objective: To evaluate the three-dimensional positional changes (anteroposterior, vertical, and mediolateral) in the condyle /and the glenoid fossa utilizing different Class II fixed mandibular positioners/appliances (Herbst and Xbow) compared to controls.

  Methods: The primary sample consisted of 59 patients with Class II malocclusion between ten and sixteen years of age (10-14 females and 11-16 males). Patients were randomly allocated to one of the three groups (Herbst, Xbow, and control). Two CBCT images were taken for each patient, corresponding to pre-and post-treatment. The mandibular condyle and glenoid fossa position relative to the reference planes were assessed using Avizo© software using landmark to plane distance calculation. Reliability was assessed using ICC. MANOVA was conducted to determine whether the groups had a mean difference.

  Results: Five patients were subsequently excluded because the time interval between T0 and T1 CBCT images was more than 16 months, resulting in a final sample size of 54 subjects (the average interval was 12.4 months). Regarding all dimensional positional changes (anteroposterior, mediolateral, and vertical), there was no significant difference in means of variations in the orthogonal distance of the condyle /and glenoid fossa landmarks based on groups (p > 0.05).

  Conclusion: All three groups had no significant differences (p>0.05) in the mean positional change in the condyle and fossa jointly, condyle separately, and fossa separately across all dimensions (anteroposterior, vertical and mediolateral) following treatment. Additionally, fixed class II appliances (Herbst and Xbow) did not result in an additional or restrictive significant positional change in condyle relative to the fossa position compared to controls.

• Subjects / Keywords

  • TMJ
  • Condyle
  • Fossa
  • Mandible
  • Positional
  • Alteration
  • Change
  • Herbst
  • Xbow
  • Crossbow
  • Adolescents
  • CBCT

• Graduation date

  Fall 2022

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/r3-pfaz-sq90

• License

  This thesis is made available by the University of Alberta Library with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.