Temporomandibular joint disorder (TMJD or TMD), or TMJ syndrome, is an umbrella term covering acute or chronic inflammation of the Temporomandibular joint, which connects the mandible to the skull. The disorder and resultant dysfunction can result in significant pain and impairment. Because the disorder transcends the boundaries between several health-care disciplines — in particular, dentistry and neurology — there are a variety of treatment approaches. An older name for the condition is "Costen syndrome". Prosthodontic Treatment for TMJ/TMD-Occlusal splints.