What is the definition or description of: jaw locking?

Ouch!: Jaw locking is when the temporo-mandibular joint, aka: the TMJ (everyone has two) gets stuck out of position. Usually because one opens so wide that part of the joint on one's jaw (the condyle) gets stuck in front of the cartilage in the joint (disc) or bone in front of the joint's pivot point (the articular eminence). This is a highly complex and critical joint; if you have problems, consult a professional right away.

Unable to close jaw.: Upon opening the jaw remains locked in an open position. It can be for a short time seconds or until assisted by a dentist to close.

Usually open: Most "jaw locking" refers to a situation in which the patient's jaw is stuck in the open position.This occurs when the condyle (part of the lower jaw) slips past the arcuate eminence (part of top jaw/ cheekbone) and the musclestighten and hold it there. The muscles usually spasm, and the patient cannot close. When this happens, we have to reposition the jaw to release it and return it to position.

Lock: Inability to open fully or close fully. See your Dentist immediately as probably have joint dysfunction.

Displaced disk: Your jaw may be locked, which means that the articular disk that joins the upper and lower jaws (maxilla and mandible, ) may be out of place. It may be displaced forward and does not allow the mandible to get back to its comfortable position and the lower teeth therefore do not come together.

Open and closed: Jaw locking can occur due to interference between the disk and the jaw bones (closed lock) or the upper and lower bones of the TMJ (open lock). Treatments are completely different. See a TMJ specialist if your symptoms trouble you.