Temporomandibular joint and normal occlusion: Is there anything singular about it? A computed tomographic evaluation (original) (raw)
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Oral surgery, oral medicine, and oral pathology, 1985
Transcranial radiographs are frequently used to assess condyle-fossa relationships. However, their validity in representing condyle position has been questioned. Intermethod comparisons were performed between methods assessing condyle position by subjective evaluation and by linear and area measurement of the interarticular space. Linear measurement of the subjective closest anterior and posterior interarticular space and subjective evaluation were the mutually preferred methods in both transcranial radiographs and tomograms. Statistically significant correlations were shown (p less than 0.05) for condyle position between pairs of clinical transcranial radiographs and linear tomograms of the same temporomandibular joints. However there was a qualitative concordance in assessed posterior concentric and anterior positions in only 80% of the pairs, and a full concordance in the degree of condylar displacement was found in only 60% of the cases. Although still clinically helpful, the us...
Evaluation of condylar position from temporomandibular joint radiographs
The Journal of Prosthetic Dentistry, 1985
T he position of the mandibular condyles in the glenoid fossae is an important factor in treatment planning for temporomandibular joint (TM J) disorders, myofascial pain-dysfunction, and occlusal rehabilitation. However, the interpretation of condylar position from radiographs and the usefulness of such radiographic information relative to various treatment procedures are still controversial."9 Several investigatorsi0-'2 have indicated that the wide range of normal anatomic variation makes it impossible to predict the precise location of the condyle or to measure the actual distances between points on the condyle and fossa. On the other hand, WeinbergI reported that condylar asymmetry does not affect the superior portion of the joint, and he concluded that condylar position can be determined if radiographic measurements are limited to this region. Other investigator.?' reported that TM J radiogiaphs can only record the relative position of joint structures and that no attempt should be made to obtain direct measurements of the joint space.
Journal of Oral and Maxillofacial Surgery, 2004
Purpose: The purpose of this study was to determine whether the position of the mandibular condyle in patients with anterior disc displacement (ADD) is different from that of a control group with normal joints using a novel method to quantify the irregular shape of the temporomandibular joint (TMJ). Materials and Methods: Twenty-six magnetic resonance images of TMJs with ADD were evaluated and compared with 14 normal joints. The position of the condyle was determined by using 2 different methods: 1) measuring the horizontal and vertical normalized distances in millimeters between the geometric centers of the glenoid fossa and the condyle and 2) calculating the anteroposterior joint space ratio. Results: Using the first method, the horizontal distance between the centers of the condyle and the glenoid fossa was 14.0 Ϯ 11.1 in the ADD group and 5.3 Ϯ 10.9 in the control group (P Ͻ .001). The vertical distance was 64.7 Ϯ 22.7 in the ADD group and 68.3 Ϯ 32.9 in the control group (P ϭ .015). The ratio of the horizontal and the vertical condylar displacement in the ADD group was 2.4. Using the second method, the anteroposterior joint space ratios in the ADD group and in the control group were 1.7 Ϯ 0.5 and 1.2 Ϯ 0.4, respectively (P ϭ .001). Conclusion: This study found that condyles of patients with ADD were situated more posterior and superior in the fossa than those in the control group. Moreover, in the ADD group, the posterior condylar displacement was noted to be 2.4 times greater than the superior condylar displacement.
European Journal of Dentistry
Objectives: The aim of the study is to investigate the condylar position and its relation to articular eminence and axial condylar angle in temporomandibular joint disorder (TMD) patients and in normal controls using cone beam computed tomography (CBCT). Materials and Methods: CBCT temporomandibular joint (TMJ) images of 70 participants (38 males and 32 females, mean age 26.4 years) were analyzed. They were divided into control group (including 35 subjects) and study group (including 35 subjects). Linear measurements of joint space and condyle determined the condylar position of each TMJ. Articular eminence height and inclination were also measured with axial condylar angle to determine its relation to condylar position. Independent and paired sample t-test was applied to compare between the groups and TMJ sides of the same group at significance level of 0.05. Results: Statistical significant differences were found between males and females of both groups regarding superior joint sp...
Analysis of mandibular position using different methods of location
Acta odontológica latinoamericana : AOL, 2009
There has been much discussion regarding the ideal position of the condyle in the mandibular fossa. Although the centric relation position (CR) is used as a reference, some authors do not believe that it is physiologic. Thus, the aim of this study was to evaluate in a group of asymptomatic individuals the position of the condyle in the mandibular fossa at maximum intercuspation (MI), with a occlusal splint and with a Lucia jig between the teeth. It was analyzed by means of magnetic resonance imaging (MRI), transcranial radiography imaging and analysis of horizontal axis of rotation from casts mounted on an articulator. The results showed that even if patients had mandibular displacement in positions of CR, habitual maximum intercuspation and with the occlusal splint, confirmed by means of the analysis of the horizontal axis of rotation, the images showed no statistically significant differences among condylar positions. It can therefore be concluded that the positions analyzed were ...
Anatomic study of condylar position at maximum intercuspation
The Journal of Prosthetic Dentistry, 1982
Knowledge of the spatial relationship between the mandibular condyle and fossa at maximum intercuspation is important in orthodontics, prosthodontics, and in the diagnosis and therapy of temporomandibular joint (TMJ) dysfunction. 1-3 The study of this relationship has been the object of much research. Ricketts 4 and Chaconas and Logdson s have studied this relationship with measurements obtained by laminography. Ismail and Ahmed 6 recently published a radiographic study of the mandibular condylar position in centric occlusion and eentric relation using oblique lateral transcranial projection. The aim of the present study was to clarify the spatial relationship between the head of the mandibular condyle and the mandibular fossa at maximum intercuspation of the teeth in dry skulls.
Assessment of radiographic morphology of mandibular condyles: a radiographic study
Folia Morphologica, 2021
Background: Panoramic radiographs are the most common radiographic tool used by the dental clinicians to evaluate teeth, mandible and other related structures of the jaws. Mandibular condyle is an important anatomical landmark for facial growth, expressed in an upward and backward direction. The presentation of mandibular condyle differs widely among different group of ages and individuals. Materials and methods: The retrospective cross-sectional study was conducted from Nov 2018 to March 2019 at Dow International Dental College (DIDC) Karachi that includes radiographic evaluation of 500 mandibular condyles. All retrievable OPGs were obtained and data were extracted regarding age, gender and condylar morphology. Results: The morphological appearances of mandibular condyle have great variation among different age groups and subjects. Normally we recognize five basic shapes i.e. Oval, Bird beak, crooked finger, diamond and mixed. Out of 250 pair of condylar heads that were evaluated, 50% were oval, 40% bird beak, 4.8% crooked finger and diamond 4.8%. Conclusions: All four morphological types of mandibular condyles were observed and the oval shape condyles were most prevalent among both genders and all age groups. In future studies, the inclusion of other parameters and large sample size may provide unique information.
International Journal of Dentistry, 2023
Statement of the Problem. Te mandibular condyle position is important in temporomandibular joint (TMJ) disorders. Te bite force is a mechanical force that may afect the condylar position. Purpose. To investigate the relationship between condylar position in the glenoid fossa and maximum bite force in adults with normal temporomandibular joint. Materials and Methods. In this cross-sectional study, 23 subjects (21 females and 2 males; mean age 38.88 ± 11.7 years) with 41 joints participated. Right and left joints were examined using cone-beam computed tomography. Maximum bite force was measured using the strain gauge transducer in the regions of right molar, left molar, and incisors. Pearson correlation coefcient, paired sample t-test, and binary logistic regression were employed for analysis. Results. Te mean maximum bite force was 169.09 ± 87.7 N. Te most common position of the condyle was anterior (n � 36) and inferior (n � 31). Te mean of mandibular condyle joint spaces for right and left sides were not statistically signifcant (P > 0.05). Tere were no relationships between the condylar positions and the mean maximum bite force (P > 0.05). Conclusion. Te condylar positions in the glenoid fossa are not related to the bite force in the people with normal temporomandibular joint.