Evaluation of effusion and articular disc positioning after two different arthrocentesis techniques in patients with temporomandibular joint disc displacement without reduction.

Conventional arthrocentesis was able to change the effusion variable, whereas the single needle arthrocentesis was not. Both techniques were responsible for altering the position of the mandibular head or the disc-head complex, projecting them to a more anterior position related to the increase in the final maximum interincisal distance.