If the name Botox ® has managed to move from being a trademark to a popular language, it's because it has become the leading product in the field of anti-aging aesthetic medicine, to smooth out expression lines. In fact, botulinum toxin has other less known indications, such as the possible treatment of torticollis, bladder incontinence, hyperhidrosis, strabismus or bruxismus or teeth grinding. A closer look at the treatment of teeth grinding by botulinum toxin injection.
Causes : where does the teeth grinding of bruxism come from?
- The word bruxism has its origin in a Greek word meaning "teeth grinding".
- Bruxism is defined as a para-function of the manducational apparatus:
- The manducatory apparatus groups together the structures that occur before digestion. It is the upper palate, the tongue and the masticatory apparatus (jaws dental arches).
- A parafunction is defined as a function without purpose. It is therefore different from a dysfunction, a function that is basically useful but poorly performed.
Bruxism is expressed by contractions of the jaws with dental grinding, often involuntary and nocturnal.
The exact aetiology of bruxism is very widely discussed, with probably a bad position of the mandible at rest, psychosomatic causes, dental causes (mucous coating of the wisdom teeth, malocclusion...), oral causes (inflammation of the masseter...) ...
The patient is not always aware of this. Sometimes it is the dentist who suspects teeth grinding at night because he notices abnormally worn teeth.
How does Botox stop teeth grinding?
Botox ® can suppress teeth grinding by its myorelaxing action on muscle relaxation.
This neurotoxin stops the transmission of signal between the nerve and muscles: the functioning of the junction (synapse) requires a chemical signal, acetylcholine. The botulinum toxin will saturate the receptors of this neuro-mediator, which can no longer act.
As the muscle no longer receives information, it relaxes (myorelaxing effect) and stops contracting (flaccid paralysis). This effect is reversible over approximately 4 to 6 months.
To correct bruxism, botulinum toxin injections will restore harmony in the excessive muscle contractions acting to lower and raise the maxilla.
By relaxing the muscles as the masseter does, the manducator is no longer under tension and the jaw is relaxed.
The grinding of the teeth becomes less strong and usually disappears in the end.
The consequences of bruxism are various: altered sleep, early wear of the dental enamel, chewing pain, TMJ (temporomandibular joint) disorders, vertebral contractures, tooth loosening...
TMJ disorders often have a chronic evolution, with cracking mouth movements, difficulty opening the jaw, a square modification of the lower third of the face, hearing problems or the occurrence of tinnitus…
In which cases Botox injection against bruxism is indicated?
- Botox injection in the masseters muscles aims to :
- Relax the masseters responsible for the teeth grinding of bruxism. It is sometimes possible to remove a daytime orthosis such as a gutter;
- Restore harmony to the lower third of the face on a square jaw resulting from hypertrophy of the masseter muscle;
- Reduce the painful jaw of the TMJ, combined with excessive muscle contraction.
Botulinum toxin injection in masseters is very well tolerated. The injection of botox in the jaw is contraindicated in patients with an allergy to egg white or in subjects with a neuromuscular disorder such as myasthenia gravis.
Le Follow a botox injection for bruxism treatment
The process is identical to any botulinum toxin injection session, and takes about 20 minutes.
The esthetic doctor will choose the points of the muscle where to inject, and the dosage. He uses fine needles to inject the product intramuscularly (cheek area).
The results of botulinum toxin injection against teeth grinding
The effect takes a few days, between five and ten.
To treat bruxism, the result is optimal from D 15.
To shape a square jaw because the masseter is too contracted, the final effect is a little delayed, starting at D21/J30. In the following weeks, the muscle will be further thinned.
Any Botox injection will see its effect disappear in 5 to 6 months, implying a new Botox injection twice a year.
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