Inclination of the condylar long axis is not related to temporomandibular disc displacement

Abstract

Aim The aim of the present study was to correlate the angle formed by inclination of the condylar long axis and median sagittal plane to the presence of internal disc derangement, as well as changes in eccentric mandibular positions. Methods The sample consisted of magnetic resonance images of 35 temporomandibular joint (TMJ) acquired with a 1.5T magnetic resonance imaging system with surface coils of 8.5 cm in diameter. Parasagittal images were used according to the following parameters: TMJ disc position with mouth closed, TMJ disc position with mouth open, TMJ disc function, and degrees of rotation and translation of the condyle. Next, we determined the angles between the condyle long axis and median sagittal plane by using axial images. Results The results showed correlations between TMJ disc position and disc function (P = 0.009), as well as between disc position and degree of condylar rotation (P = 0.008). The main purpose of the present study was to assess the angle of the condylar long axis, with no statistical correlation being found between this variable and disc position (P = 0.787), disc function (P = 0.091), condylar translation (P = 0.808), and condylar rotation (P = 0.115). Conclusion There was no relationship between inclination of the condyle long axis and parameters of internal derangements.

Association between temporomandibular joint disc position evaluated by magnetic resonance imaging and mandibular condyle inclination evaluated by computed tomography

“…The DDwR was the most prevalent disc position (59.4%), as reported by other studies 21,41,42 . The disc reduction capacity has been related to anatomical characteristics of the mandibular condyle and mandibular fossa 23,24 .…”

“…Various investigations have been carried out analysing the association between the mandibular condyle inclination, especially the horizontal inclination, and the position of the articular disc and the results remain controversial 39,42,47,49 . In addition, due to the cross‐sectional design of the studies, including the present, it is not possible to establish a cause and effect relationship between the angles of the condyle and the positions of the disc.…”

“…In contrast, Pregarz et al 47 reported results in which more horizontal condyles were associated with disc displacement without reduction while Amorin et al 42 found no association between the horizontal condylar inclination and disc displacement.…”

Relation between Condyle Horizontal Angle and Intercondylar Angle with Disc Displacement in Patients with Temporomandibular Joint Disorders: An MRI Evaluation

“…Moreover, the excessive stretching of the lateral pterygoid muscle imposed a load on the condyle's lateral pole, consequently increasing the horizontal condylar angle. Sato et al [21] and Amorim et al [22] detected no signifcant relationship between the increased horizontal angle and condylar abnormality at an initial or advanced phase. However, Raustia and Pyhtinen [23] noted that the horizontal angle in patients with TMD was smaller than that in normal individuals.…”

Association between bilateral condylar resorption and reduced volumes of the craniofacial skeleton and masticatory muscles in adult patients: A retrospective study

“…Apart from the changes in the craniofacial musculoskeletal volume, we also found that the intercondylar angle was significantly lower in the BCR group than in the control group. Although some researchers found no association between the horizontal condylar inclination and disc displacement [ 20 ], there are many studies reported that the medial horizontal inclination of the mandibular condyle was associated with disk displacement without reduction [ [21] , [22] , [23] , [24] ]. Our study also found significant correlation between the ICA and disk displacement.…”