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Trismus
Trismus, or lockjaw, refers to reduced opening of the jaws caused by spasm of the muscles of mastication, or may generally refer to all causes of limited mouth opening. It is a common problem with a variety of causes, and may interfere with eating, speech, oral hygiene, and could alter facial appearance. There is an increased risk of aspiration. Temporary trismus is much more common than permanent trismus, and may be distressing and painful, and limit or prevent medical examination or treatments requiring access to the oral cavity.
==Definition==
Classically, the definition of trismus is an inability to open the mouth due to muscular spasm, but more generally it refers to limited mouth opening of any cause. Another definition of trismus is simply a limitation of movement.〔 Historically and commonly, the term ''lock jaw'' was sometimes used as a synonym for both trismus and tetanus. Definitions from popular medical dictionaries vary, e.g.:
"a motor disturbance of the trigeminal nerve, especially spasm of the masticatory muscles, with difficulty in opening the mouth (lockjaw); a characteristic early symptom of tetanus."
"a firm closing of the jaw due to tonic spasm of the muscles of mastication from disease of the motor branch of the trigeminal nerve. It is usually associated with general tetanus. Also called lockjaw."
"a prolonged tonic spasm of the muscles of the jaw."
"spasms of the muscles of mastication resulting in the inability to open the oral cavity; often symptomatic of pericoronitis."〔(【引用サイトリンク】url=http://medical-dictionary.thefreedictionary.com/trismus )〕
Normal mouth opening ranges from 35 to 45 mm.〔 Males usually have slightly greater mouth opening than females. (40-60mm)=(avg-35mm). The Normal Lateral movement is (8-12mm). Some have distinguished mild trismus as 20–30 mm interincisal opening, moderate as 10–20 mm and severe as less than 10 mm.
Trismus is derived from the Greek word ''trismos'' meaning "a scream; a grinding, rasping or gnashing"〔(【引用サイトリンク】url=http://www.etymonline.com/index.php?allowed_in_frame=0&search=trismus&searchmode=none )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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