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Trismus, commonly known as lockjaw, is a condition characterized by limited mouth opening, resulting from spasms of the masticatory muscles, dysfunction of the temporomandibular joint (TMJ), or damage to surrounding tissues. The primary causes of trismus include:
* Dental Problems: Dental abscesses, infections, and certain oral surgical procedures, particularly lower wisdom tooth extractions, can induce inflammation and muscle spasms, thereby restricting jaw movement.
* Temporomandibular Joint (TMJ) Disorders: Conditions such as TMJ dysfunction or arthritis can lead to pain and impaired jaw opening mechanics, contributing significantly to trismus.
* Trauma and Injuries: Direct trauma or injury to the jaw or facial region can cause damage to the associated muscles and tissues, leading to trismus.
* Radiotherapy: Radiation therapy, especially when applied to the head and neck region, can result in fibrosis (hardening) of muscles and connective tissues, thereby causing restricted jaw mobility.
* Neuromuscular and Systemic Conditions: Disorders like myofascial pain syndrome, neurological diseases such as Parkinson's disease and multiple sclerosis (MS), alongside psychological factors like stress and anxiety, can trigger involuntary contractions of the jaw muscles, predisposing individuals to trismus.
Why Does Trismus (Lockjaw) Occur?
* Dental Problems: Dental abscesses, infections, and certain oral surgical procedures, particularly lower wisdom tooth extractions, can induce inflammation and muscle spasms, thereby restricting jaw movement.
* Temporomandibular Joint (TMJ) Disorders: Conditions such as TMJ dysfunction or arthritis can lead to pain and impaired jaw opening mechanics, contributing significantly to trismus.
* Trauma and Injuries: Direct trauma or injury to the jaw or facial region can cause damage to the associated muscles and tissues, leading to trismus.
* Radiotherapy: Radiation therapy, especially when applied to the head and neck region, can result in fibrosis (hardening) of muscles and connective tissues, thereby causing restricted jaw mobility.
* Neuromuscular and Systemic Conditions: Disorders like myofascial pain syndrome, neurological diseases such as Parkinson's disease and multiple sclerosis (MS), alongside psychological factors like stress and anxiety, can trigger involuntary contractions of the jaw muscles, predisposing individuals to trismus.