IADR Abstract Archives

Etiology of Anterior TMJ Disk Displacement

Objectives: The aim of this research study shall be to shed light on the etiology of this discopathy: Anterior Temporomandibular joint (TMJ) disk displacement (ADD). As of yet, no conclusive evidence exists to the pathogenesis of this disease. Several possibilities to consider are; the superior head of the lateral pterygoid muscle (SLPM), the bilaminar zone, the collateral discal ligaments, and the synovium and its surrounding fluid.

Methods: The argument pros and cons for each of potential mechanisms proposed for the cause of the subluxation of the disk shall be extensively researched and reviewed using the general literature.

Results: The TMJ disk is attached anteriorly via the SLPM, and a large variation among humans exists as to the extent of this attachment. Even anatomists such as Netter and Gray are portraying the attachment sites differently. It was found by researcher that in individuals with SPLM attachment directly to the disk, a statistically significant percentage had ADD compared to those who did not. Attached posteriorly via the Bilaminar zone, whose main role is to insure the disk doesn't move to far anteriorly. The pad has elastic properties that infer to it the ability needed to push back the disk. Hence, losing its elastic recoil would render its function impossible. Attached medially and laterally via the Collateral Discal ligaments, consider by some the Achilles heal of the TMJ. The TMJ is surrounded by the synovium and synovial fluid, which provide lubrication and nutrition to the TMJ. Nitzan, a proponent of arthrocentesis, showed that it is the extent of the lubrication is causing the TMJ to function properly.

Conclusions: Although not enough conclusive evidence exists to confirm a single modality, this disease is most likely multifactorial each must play a role. Moreover, anyone of them could trigger the chain reaction leading to the disease.


Division: IADR/AADR/CADR General Session
Meeting: 2011 IADR/AADR/CADR General Session (San Diego, California)
Location: San Diego, California
Year: 2011
Final Presentation ID: 3530
Abstract Category|Abstract Category(s): Oral & Maxillofacial Surgery
Authors
  • Hachmeh, Karim John  ( New York University College of Dentistry, New York, NY, USA )
  • Glickman, Robert S.  ( New York University College of Dentistry, New York, NY, USA )
  • SESSION INFORMATION
    Poster Session
    Oral & Maxillofacial Surgery IV
    03/19/2011