Botox For Bruxism

Understanding the Muscles of Mastication

Size and Relevance to TMJ, Bruxism and Botox

The muscles of mastication are key players in jaw movement and are directly involved in conditions like TMJ (Temporomandibular Joint Disorders) and bruxism (teeth grinding). Here’s a look at these muscles, arranged from largest to smallest, and their relevance to these conditions:

Muscles That Botox Treatments Commonly Target

1. Masseter Muscle: This is the largest and most powerful muscle of mastication. It plays a significant role in clenching the jaw and is often involved in bruxism. This muscle is commonly injected in botox bruxism treatments. Botox injections in the masseter muscle can also be used for cosmetic jawline slimming.
2. Temporalis Muscle: Located over the temples, the temporalis assists in closing the jaw and clenching. If symptoms indicate, administering Botox injections in the temporalis muscle can also effectively treat bruxism (eg associated headaches)

Muscles That Botox Treatments Seldom Target

1. Medial Pterygoid: This muscle, while smaller than the masseter and temporalis, assists in elevating the jaw and plays a role in grinding movements from side to side. It can be involved in TMJ disorders by contributing to uneven jaw movements and strain.
2. Lateral Pterygoid: The smallest of the mastication muscles, the lateral pterygoid helps open the jaw and move it from side to side. Its function is crucial in the mechanics of the TMJ and can be a source of dysfunction in TMJ disorders.

Botox For Teeth Grinding (Bruxism)

A review by Colgate shows that Botox offers notable benefits for treating bruxism, which is the term for teeth grinding. This treatment benefits those without success and other methods to change this involuntary behaviour. Botox works by being injected into the muscles that control jaw movement, primarily the masseter muscle and possibly the frontalis and temporalis muscles, depending on individual needs. This helps to reduce muscle activity that leads to teeth grinding, alleviating associated symptoms like jaw pain, headaches, and dental wear.