Condylar degeneration in patients with dental open bite versus skeletal open bite utilizing CBCT

Idiopathic condylar resorption (ICR) is a condition in which either one or both condyles undergo degeneration. Bilateral TMJ involvement presents as a clockwise rotation of the mandible in the posterior-inferior direction, resulting in an anterior open bite. The purpose of the study was to assess TMJ condylar degeneration in dental open bites compared to skeletal open bites

Condylar degeneration in anterior open bite patients: A cone beam computed tomography study

Objectives: The purpose of this study was to investigate the prevalence of condylar degeneration in patients with anterior open bites (AOB). Study design: Cone beam computed tomography (CBCT) scans of 194 patients with AOB (108 with skeletal open bites and 86 with dental open bites) and 100 patients serving as controls were included in this retrospective study. Two oral and maxillofacial radiologists categorized each of the 588 condyles as normal, degenerative-active, or degenerative-repair. The χ2 analysis with Bonferroni adjustment was used to evaluate the relationship of condylar status (normal vs degenerative) to anterior open bites. Results: Of the 103 degenerative condyles, there were 59 in the group with skeletal open bites, 14 in the group with dental open bites, and 30 in the control group. Condylar degeneration occurred twice as frequently in patients with skeletal open bites as it did in the control group (P \u3c .0001). Conversely, a greater frequency of normal condyles was found in the group of patients with dental open bites (P = .0002). The group with skeletal open bites also showed a significantly higher frequency of bilateral degenerative condyles (P = .0001). The frequency of condylar degeneration did not differ significantly between female and male individuals. Conclusions: Degenerative condylar change was significantly more likely in patients with skeletal open bites and less likely in patients with dental open bites

Morphologic characteristics of open bite patients with and without condylar degeneration utilizing CBCT 3-dimensional analysis

Condylar degeneration can result in backward rotation the mandible and opening of the mandibular plane angle, resulting in an anterior open bite. The purpose of the study was to compare the morphologic characteristics of patients with anterior open bites with and without condylar degeneration utilizing CBCT 3D analysis