Does the use of soft or hard splints affect the short-term outcome of temporomandibular joint arthrocentesis?

Arthrocentesis is an effective treatment modality for temporomandibular joint (TMJ) disc displacement without reduction (DDw/oR), especially in patients who do not respond to non-surgical methods, and is nowadays regarded as a first-line treatment. Soft and hard stabilizing splints have also been used to treat TMJ disorders, but no data are available regarding the use of splints following arthrocentesis. The aim of this study was to compare the effect of the use of soft or hard stabilizing splints versus no appliance following TMJ arthrocentesis on the prognosis of the treatment. Forty-five patients with DDw/oR were included in the study. Pain was measured on a visual analog scale, and maximal mouth openings, lateral jaw movements and tenderness were recorded before arthrocentesis. Following arthrocentesis hard splints were fabricated for 22 patients, soft splints for 9 patients, and 14 patients without any splint served as controls. All the measurements were repeated 1 day, 1 month, 3 months and 6 months after arthrocentesis. Improvement in mouth opening was significant as well as decrease in pain in all groups regardless of the use of splints (P<0.05). Arthrocentesis alone is a successful procedure in the treatment of DDw/oR; the use of splints as an additional therapy does not affect the short-term prognosis.