Jul 30
Jul 30
Jul 29
Jul 22
Jul 19
Jul 17
A click in the jaw when opening the mouth is one of the most common findings in dentistry, and one of the least understood by patients. For most people it is a harmless mechanical event, but in a minority it signals a joint problem that benefits from assessment and conservative treatment.

A click in the jaw when opening the mouth is one of the most common findings in dentistry, and one of the least understood by patients. For most people it is a harmless mechanical event, but in a minority it signals a joint problem that benefits from assessment and conservative treatment.
The temporomandibular joint is a synovial joint in which a fibrocartilaginous disc sits between the condyle of the mandible and the articular eminence of the temporal bone. Normal function requires the disc to remain interposed as the condyle translates forward.
The most common cause of a single, reproducible click is anterior disc displacement with reduction, in which the disc slips forward when the mouth closes and snaps back into place during opening. The sound occurs at the moment of reduction, typically in the early or middle phase of opening.
Crepitus is a grinding, gravel-like sound that indicates degenerative change to the articular surfaces, and it behaves differently from a discrete click. Sounds can also arise outside the joint, from the stylohyoid ligament or from muscles, and these do not reflect joint pathology.
Studies of general populations report that between 25 and 40 per cent of adults have some form of joint noise on examination, and the majority are asymptomatic. A study in the Journal of Oral Rehabilitation in 2011 reported that clicking was the single most prevalent sign in the sample.
Only a small proportion of those with clicking develop pain or functional limitation, with estimates generally between 5 and 10 per cent. A longitudinal study in the Journal of Dental Research in 2016 found that most joint sounds persisted unchanged over several years without treatment.
Clicking warrants assessment when it is accompanied by pain, locking, limited opening, deviation of the jaw on opening or a change in the character of the noise. A study in the Journal of the American Dental Association in 2014 found that pain on function was the strongest predictor of clinically significant joint disorder.
Closed lock describes the situation in which the disc remains displaced and the mouth cannot open fully, usually beyond 35 to 40 millimetres. This is a distinct clinical entity that requires prompt management rather than observation.
Rapid onset of swelling, fever, trauma or inability to close the mouth suggests infection, fracture or dislocation rather than a disc disorder. These presentations need urgent evaluation rather than conservative self-care.
Clenching and grinding load the joint beyond its physiological range and are common in people with clicking. A study in the Journal of Prosthetic Dentistry in 2012 reported that self-reported bruxism was significantly more frequent in patients with disc displacement than in controls.
Deep overbite, loss of posterior support and malocclusion alter the direction of loading across the joint. A study in the Angle Orthodontist in 2011 found an association between specific occlusal features and joint sounds, although the effect size was modest.
Psychological stress increases muscle activity and is frequently reported by patients whose clicking has recently become painful. A study in the Journal of Orofacial Pain in 2013 reported that stress and anxiety scores were elevated in patients with painful joint disorders.
The clinician asks when the sound began, whether it is painful, whether the jaw has ever locked and whether habits such as clenching or gum chewing are present. A study in the Journal of the American Dental Association in 2016 found that a structured history identified clinically significant disorders with reasonable accuracy before examination.
Range of movement, deviation on opening, joint tenderness and muscle palpation are recorded, and the sound is characterised as a click or as crepitus. A study in the Journal of Oral Rehabilitation in 2018 reported that clinical examination alone was sufficient for diagnosis in most cases of disc displacement.
Imaging is reserved for atypical presentations, suspected degeneration or cases that fail conservative treatment, since magnetic resonance imaging remains the reference standard for disc position. A study in Dentomaxillofacial Radiology in 2015 reported that imaging altered management in only a minority of routine clicking cases.
Soft food, avoiding wide opening such as during yawning, and limiting chewing gum reduce load on the joint during a symptomatic period. A systematic review in the Journal of Oral Rehabilitation in 2018 concluded that conservative measures remain the first line for disc displacement.
A stabilisation splint can reduce parafunctional loading, and physiotherapy improves coordination of the masticatory muscles. A study in the Journal of the American Dental Association in 2017 reported that splint therapy produced modest improvements in pain scores but did not reliably eliminate clicking.
Irreversible interventions such as occlusal adjustment or extensive prosthodontics have no reliable evidence for treating joint noise and may worsen the situation. A review in the Journal of Orofacial Pain in 2015 cautioned against irreversible treatment in the absence of a clear diagnosis.
Keeping the teeth apart with the lips closed and the tongue resting on the palate reduces daytime clenching, and chewing should be balanced between both sides. Regular breaks from screen work reduce the sustained low-level muscle activity that accompanies concentration.
Oral hygiene should not require the mouth to be held open for long periods, and a compact brush helps reach the posterior teeth without extreme opening. A powered brush such as the BrushO with a small head and a two minute timer shortens the time the jaw remains in a strained position, which matters for patients whose muscles are already sensitive.
Joint sounds often persist for years without significant change, and a study in the Journal of Dental Research in 2016 found that most patients with clicking at baseline still had clicking at follow-up but had not developed pain. Reassurance is therefore a legitimate part of management rather than a dismissal of the complaint.
Reduced parafunction, better sleep and management of stress are associated with improvement in painful cases. A study in the Journal of Oral Rehabilitation in 2019 reported that structured patient education alone produced measurable improvement in a substantial proportion of participants.
Jaw clicking usually reflects anterior disc displacement with reduction and is present in a large proportion of the adult population without causing harm. Assessment is warranted when clicking is accompanied by pain, locking, limited opening or deviation, and conservative measures such as soft food, splint therapy and habit change remain the first line of care.
(内容由AI生成,仅供参考)
Sep 28
Sep 28
Jul 30
Jul 30
Jul 29
Jul 22
Jul 19
Jul 17

Wisdom teeth, or third molars, are the last teeth to erupt, and a large proportion of them never achieve a functional position. When a wisdom tooth is trapped beneath the gum or bone, it is described as impacted, and the decision to remove it is one of the most common surgical judgments in dentis...

Disk displacement is the most common internal derangement of the temporomandibular joint (TMJ) and a frequent reason for orofacial pain consultations. Magnetic resonance imaging (MRI) is the accepted gold standard for confirming the position of the articular disk because it visualizes soft tissue...

Pulp sensibility testing remains the first diagnostic step before any endodontic intervention. Cold, heat and electric pulp tests (EPT) probe the neural response of the pulp through enamel and dentin, and their results decide whether a tooth needs root canal treatment, a direct pulp cap or simple...

Mouthguards protect teeth from sports trauma and night-time grinding, but a dirty guard can become a reservoir for bacteria, fungi and oral disease. Studies show that used mouthguards accumulate plaque, streptococci and Candida within days of normal wear, and poor hygiene has been linked to gingi...

Halitosis, or persistent bad breath, affects a large share of the adult population and carries real social and psychological consequences. In the vast majority of cases the source is the mouth itself, and the most important reservoir is the coating on the dorsal surface of the tongue. Understandi...

Root canal treatment succeeds only when instrumentation stops at the right place. Working length is the distance from a stable coronal reference point to the apical constriction, and every millimeter of error changes the outcome: over-instrumentation pushes debris and irrigant beyond the apex, wh...

Dry mouth is one of the most common complaints in dental practice, yet it is frequently underestimated. Xerostomia is the subjective feeling of oral dryness, while salivary hypofunction is the measurable reduction in saliva output, and the two do not always coincide. Because saliva protects teeth...

Diabetes affects more than blood sugar, and the mouth is often one of the first places where the disease makes itself known. The relationship is genuinely bidirectional: uncontrolled diabetes increases the risk and severity of periodontal disease, while severe gum inflammation makes blood sugar h...

Enamel is the hardest tissue in the human body, but it is not indestructible. Dental erosion is the chemical dissolution of enamel by acids that are not produced by bacteria, and modern diets supply those acids in abundance. Understanding how acidic foods and drinks attack the tooth surface is th...

A good toothbrush should work as well in a hotel bathroom as it does at home, and that is exactly what BrushO Travel Mode is designed to do. By lowering motor speed and trimming acoustic output, Travel Mode keeps the full two-minute cleaning routine in a form that is discreet enough for shared ro...