Severely restricted mouth opening can interfere with eating, oral hygiene and daily life. One possible cause is temporomandibular joint ankylosis, in which abnormal fibrous or bony attachment restricts movement at the jaw joint. This is different from common painless clicking and requires a specialist diagnosis.
Why does the cause of restricted opening matter?
Ankylosis can follow joint injury or other disease. Limited opening can also have other explanations, so it should not be diagnosed from a symptom alone. Examination and appropriate imaging help the surgeon assess the joint and surrounding anatomy. Severe post-traumatic joint problems can have consequences for jaw function and, in children, development. Post-traumatic TMJ disorders
Does ankylosis always require joint replacement?
Not necessarily. Surgical options vary, and specialist assessment considers whether release, reconstruction or total replacement is appropriate. Total prosthetic replacement is an option for selected severely affected joints, rather than a default treatment for every form of TMD. NICE: Indications and current treatments
What does a customised joint mean?
A customised prosthesis is designed around an individual patient’s anatomy using imaging-based planning. Total replacement substitutes artificial components for the joint surfaces. The surgeon must explain why a patient-specific or other implant design is appropriate, how the operation will be performed and what rehabilitation involves. NICE: The replacement procedure
What should patients ask?
Ask what improvement is realistic for mouth opening and everyday function, which alternatives exist and what could still remain difficult after treatment. Request a discussion of infection, nerve injury, persistent symptoms, implant problems and possible future operations. A customised device does not remove surgical risks or guarantee lifelong performance.
Before scheduling major treatment, establish the hospital, responsible surgeon, anaesthesia arrangements and follow-up plan. Ask for clear guidance on any exercises and how progress will be monitored. NICE: Total TMJ replacement guidance
Frequently asked questions
Is every locked jaw ankylosis? No. A clinician must distinguish the causes of limited movement before selecting treatment.
Is a replacement joint the next step after a nightguard fails? No. Replacement requires a specific structural and clinical indication, not simply failure of one treatment.
What should I bring for a second opinion? Bring scans, previous operation records, implant information if relevant and a summary of treatment already tried.
Contact The Curve Dental Solutions in Andheri West to enquire about assessment and the appropriate specialist route. TMJ replacement is hospital surgery, not a routine chairside dental procedure.
Related reading: Dental consultation