The Relationship of the Articular Eminence with the Mandibular Fossa: Implications for Temporomandibular Joint Mechanics

Undifferentiated mesenchymal (UM) cells, the progenitor cells of the cartilage layer, have been assigned a significant role in TMJ articular tissue maintenance. This was based on reports of UM cell reduction with increased soft-tissue thickness for the condyle and temporal component. However, the strength of this inverse relationship was not presented and remained unclear. The purpose of the present study was to assess the strength of the correlation between UM cell presence and soft-tissue thickness in young adult TMJs at autopsy. Sagittal histological sections from the central thirds of 50 joints were evaluated with respect to articular soft-tissue thickness, histological character, and UM cell presence in the condyle and temporal component. The superior sector ofthe condyle and the articular eminence showed the greatest variability in soft-tissue thickness and were the only areas to show localized UM cell absence. The eminence was the only location to show an inverse relationship between soft-tissue thickness and UM cell presence, and this was consistent in both an ANOVA (p = 0.0016) and a Spearman correlation analysis. However, the strength of this correlation was only moderate (rho = -0.52), and no such relationship was observed in any other location. This study suggests that the relationship between UM cell presence and soft-tissue thickness is more complex than previously hypothesized and that the contribution of UM cells to articular tissue maintenance has been overstated, while other biological processes were overlooked.

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TMJ dysfunction from a myofunctional prospective

International Journal of Orofacial Myology ◽

10.52010/ijom.1977.3.1.11 ◽

1977 ◽

Vol 3 (1) ◽

pp. 11-26

Author(s):

Brendan Stack ◽

Lawerence Funt

Keyword(s):

Skeletal Muscle ◽

Temporomandibular Joint ◽

Primary Concern ◽

Myofunctional Therapy ◽

Facial Esthetics ◽

Treatment Plans ◽

Dental Profession ◽

Relationship Of ◽

The Relationship

Beginning with its founding at the start of this century by Edward H. Angle, the orthodontic profession's primary concern for its first forty years was the relationship of teeth. Orthodontists' efforts were directed towards how the teeth interdigitated. Since the early 1940's, due to the influence of Doctors Tweed, Brodie, Steiner, Margolis, etc., emphasis has been placed upon the effects of orthodontics on the patient's profile, and the profession was then concerned with both esthetics and tooth function. There are two final areas into which the bulk of the orthodontic profession has yet to move, and they are the areas of the temporomandibular joint myofunctional therapy. Orthodontists must now begin to incorporate TMJ function and the results of myofunctional therapy into their thinking and into their treatment plans and realize the effect they have upon improving the skeletal muscle, neurology and physiology of the patient's face as well as his facial esthetics and the cuspal interdigitation of his teeth. The dental profession as a whole must not only realize the role myofunctional therapy has in attaining these goals, but the role it plays in maintaining their subsequent stability.

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The Relationship of Orthodontic Malocclusions With Temporomandibular Joint Disorders

Case Medical Research ◽

10.31525/ct1-nct04123236 ◽

2019 ◽

Author(s):

Keyword(s):

Temporomandibular Joint ◽

Temporomandibular Joint Disorders ◽

Relationship Of ◽

The Relationship

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The Relationship of Temporomandibular Joint, Orofacial Pain, and Sleep Apnea

Temporomandibular Joint and Airway Disorders ◽

10.1007/978-3-319-76367-5_7 ◽

2018 ◽

pp. 125-134

Author(s):

Mayoor Patel ◽

G. Gary Demerjian ◽

Anthony B. Sims

Keyword(s):

Sleep Apnea ◽

Temporomandibular Joint ◽

Orofacial Pain ◽

Relationship Of ◽

The Relationship

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Relationship of Malocclusions with Disorders of the Temporomandibular Joint in Children of CALI—Colombia

European Journal of Dentistry ◽

10.1055/s-0041-1739450 ◽

2022 ◽

Author(s):

Nataly Mora-Zuluaga ◽

Libia Soto-Llanos ◽

Natalia Aragón ◽

Katherine Torres-Trujillo

Keyword(s):

Temporomandibular Joint ◽

Clinical Examination ◽

Significant Relationship ◽

Temporomandibular Disorders ◽

High Frequency ◽

Masticatory Muscle ◽

Frequent Symptom ◽

Tmj Pain ◽

Relationship Of ◽

The Relationship

Abstract Objective The aim of this study was to determine the relationship of malocclusion with the presence and severity of temporomandibular disorders (TMDs) in children. Materials and Methods A clinical examination was performed in 87 patients (from 4 to 14 years of age) who attended the dentistry clinics of Universidad del Valle. Results The 77 patients studied had malocclusions; 55 patients had TMD and 67.3% were female. The most frequent symptom of TMD was articular unilateral noise with 33.8%, followed by pain in at least one masticatory muscle with 26%. TMJ pain was observed in 24.7% of the patients. There was a statistically significant relationship between the presence and severity of TMD with type of dentition and transverse malocclusion, respectively. Conclusion The presence of TMD in children with malocclusion presented in a high frequency. TMD depends on the type of dentition and its severity is dependent on transverse malocclusion.

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Genetic Consideration of the Relationship Between Determinants of Occlusal Morphology, the Articular Eminence and Internal Derangement of the Temporomandibular Joint

Dental Hypotheses ◽

10.4103/denthyp.denthyp_74_19 ◽

2020 ◽

Vol 11 (1) ◽

pp. 16

Author(s):

RichardG Standerwick

Keyword(s):

Temporomandibular Joint ◽

Internal Derangement ◽

Articular Eminence ◽

The Relationship

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CHANGES IN THE LINEAR DIMENSIONS OF THE LOWER JAW WITH THE ELIMINATION OF FUNCTIONAL LATERAL DISPLACEMENT

The actual problems in dentistry ◽

10.18481/2077-7566-20-17-2-130-135 ◽

2021 ◽

Vol 17 (2) ◽

pp. 130-135

Author(s):

Ekaterina Voronina ◽

Natal'ya Nurieva ◽

Aleksandr Delec ◽

Maria Delec

Keyword(s):

Temporomandibular Joint ◽

Lateral Displacement ◽

Masticatory Muscles ◽

Cone Beam ◽

Maxillofacial Region ◽

Lower Jaw ◽

Before And After ◽

Relationship Of ◽

The Relationship ◽

Skeletal Asymmetry

Introduction. Facial asymmetries associated with lateral displacement of the jaw arise due to various reasons, namely, the presence of functional lateral displacement of the lower jaw, skeletal asymmetry of the maxillofacial region, and a combination of the above factors. Purpose. Identification of the etiological factor makes it possible to assess the possibility of correcting the position of the lower jaw and improving the relationship of the intra-articular structures of the temporomandibular joint. Materials and methods. Functional lateral displacement of the lower jaw is characterized by an asymmetric tone of the masticatory muscles, a change in the position of the chin, and dysfunction of the temporomandibular joint on the side of the displacement of the lower jaw. The article discusses a clinical case of a patient with pathology of the temporomandibular joint associated with functional displacement of the mandible. Comparison of the data of cone-beam computed tomography of the lower jaw at the site of attachment of the masticatory muscle before and after the elimination of the asymmetry of the maxillofacial region was carried out. Conclusion. An asymmetric change in the displacement of the condyles was obtained according to the data of electronic axiography, an improvement in the ratio of intra-articular structures, the presence of a change when comparing STL models of the lower jaw.

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The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽

10.1017/s0094837300025707 ◽

1980 ◽

Vol 6 (02) ◽

pp. 146-160 ◽

Cited By ~ 29

Author(s):

William A. Oliver

Keyword(s):

Critical Points ◽

Scleractinian Corals ◽

Convincing Evidence ◽

Early Triassic ◽

Rugose Corals ◽

History Of ◽

The Subject ◽

Relationship Of ◽

The Relationship ◽

Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

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