Definition of MPD (Myofascial Pain Dysfunction) Syndrome in Cranial- Mandibular Pain Dysfunction requires the presence of only one of the following for its diagnosis. (As proposed by Laskin – Etiology of the pain-dysfunction syndrome) :
- A unilateral pain, usually in the ear or pre- auricular area. The pain might radiate to the other areas, often increased during the day and was exacerbated at meal time.
- Masticatory muscle tenderness.
- Clicking and popping noises in the TMJ (temporomandibular joint). Joint sounds had to be accompanied by pain or tenderness.
- Limited opening of the jaws, or deviation of the mandible on opening, but rarely both at the same time.
This diagnosis also requires the absence of clinical or radio-logical evidence of organic changes in the TMJ.