الفهرس 
Introduction
Anatomy of Temporomandibular jointOnly 14 pages are availabe for public view
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Abstract
Introduction : Anterior disc displacement with reduction (ADDWR) is one of the most common temporomandibular disorders (TMDs). Many medications have been used for intra-articular injection in TMJ for treatment of ADDWR. One of the widely used medications is Hyaluronic acid (HA) due to its biological functions inside body joints. Collagen also has a crucial role for keeping integrity of joints and it has never been intra-articularly injected for treatment of any TMD. Aim of the study : The aim of this study was to compare the intra-articular injection of collagen versus HA as a treatment of anterior disc displacement of TMJ. Methodology : 29 patients (30 joints) seeking treatment of ADDWR were randomly divided into two groups, group I patients were injected with collagen, while group II were injected with HA. The two groups were evaluated at 1 week, 1 month and 3 months post-operatively to the second injection according to Modified Helkimo’s index for TMDs and according to lateral range of motion (lateral movement). Results : No significant difference was found between the two groups in any of the evaluation variables. Conclusion : the result confirms the crucial roles of HA as beneficial medication for treatment of ID and other TMDs. Also, it gives the chance for further investigations of collagen as a treatment of TMDs.