Does the horizontal condylar angle have a relationship to temporomandibular joint osteoarthritis and condylar position? A cone-beam computed tomography study

Abstract

Background:To evaluate the relationship between the horizontal condylar angle (HCA), temporomandibular joint osteoarthritis (TMJ OA), and condylar position on cone-beam computed tomography (CBCT) images. Materials and methods:Based on TMJ OA, joints were classified as affected and the unaffected. According to the OA condition of their joints, three groups of patients were formed: control group (n = 159, 41.1%), unilateral group (n = 121, 31.3%), and bilateral group (n = 107, 27.6%). In total, the HCAs of 774 TMJs of 387 patients were measured and their condylar positions were determined as concentric (n = 184, 23.8%), posterior (n = 338, 43.7%), and anterior (n = 252, 32.5%). Results:The mean HCA of the bilateral group (22.7° ± 7.6°) was greater than those in both the control (19.5° ± 6.4°) and the unilateral (20.5° ± 6.5°) groups (p < 0.05).However, the difference was not statistically significant between the control and unilateral group (p > 0.05). In total patients, unlike the unilateral group, the affected 1 joints had a greater mean HCA than the unaffected joints (p < 0.05). The mean HCAs of the joints according to the condylar position were as concentric: 20.6° ± 6.7°, posterior: 21.1° ± 7.8°, and anterior: 20.2° ± 7.9° (p > 0.05). Conclusions:While the HCA increased in the presence of TMJ OA, no relationship was found between HCA and three different condylar positions.

Mandibular condyle and ramus angles in healthy individuals: a multidedector computed tomography study

“…Numerous factors can cause condylar angle discrepancies, [9,10] so it is important to distinguish the normal and abnormal condylar anatomy in order to recognize its diseases and disorders. In our study, we excluded any patients with disease that could alter the normal anatomy; such as systemic diseases, [11] bone diseases, [12] trauma [13] and any metabolic diseases.…”

“…In our study, we excluded any patients with disease that could alter the normal anatomy; such as systemic diseases, [11] bone diseases, [12] trauma [13] and any metabolic diseases. [14] In a study done by Pamukcu et al, [9] temporomandibular joints of 3 groups of people were investigated on healthy controls and patients unilateral and bilateral temporomandibular joint disease. The horizontal inclination angle of condyle was revealed as 19.5°±6.4°f or the control group, which is less than our overall average ( 22 However, the overall average of horizontal angles revaled by Pamukcu et al [9] was close to our results.…”

“…This can also be defined as the longest line connecting two sides of the condylar poles. [9] The angle between this line and the coronal plane was determined as the horizontal inclination angle (Figure 2). And the angle between this line and the longitudinal plane of the ramus was defined as the ramus angle (Figure 3).…”