Not every painful bite problem is about where contact happens.

Sometimes it is about how long it happens.

That is why disclusion time matters. It refers to how long the posterior teeth remain in contact during a mandibular excursion. In a healthy system, that time is typically under 0.5 seconds. When separation is delayed, the periodontal ligament mechanoreceptors continue sending signals that keep the temporalis and masseter muscles activated.

This is where occlusion becomes neurophysiology.

In patients with prolonged disclusion time in TMD, the muscles may remain in a reflexive co-contraction pattern rather than relaxing normally. That can contribute to ischemia, metabolic waste buildup, dull muscle pain, and even chronic headache symptoms.

This changes how dentists think about occlusion and muscle hyperactivity. Muscular TMD is not always just stress or parafunction. In some cases, the bite itself may be prolonging the neuromuscular signal every time the jaw moves.

It also changes diagnosis. Traditional articulating paper can show where contacts occur, but it cannot show how long they persist or how strongly they load. That is why objective tools matter when evaluating disclusion time muscle pain and its role in TMD.

For dentists, the takeaway is simple: chronic muscle tenderness is not always mysterious. Sometimes the bite is maintaining the overload.

And that is worth measuring.

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