TMD… an ‘Illness’ or a ‘Disease’? The Essence of the Controversy Temporomandibular Disorders (TMD) is a collective term that embraces a number of clinical problems involving the masticatory (chewing) muscles, the temporomandibular joints (TMJ) and associated structures.  TMD’s are considered as a sub-classification of musculoskeletal disorders. TMD has also been defined as conditions consisting of alterations