Logan Steele
The masseter muscle is a powerful muscle that helps us chew and eat our food. It is one of four pairs of muscles that enable us to chew. Masseter muscle hypertrophy (MH) is a condition that causes the enlargement of the masseter muscle, resulting in a square-shaped or rectangular face. While the exact cause of MH is unknown, it is often associated with emotional stress, chronic clenching, grinding, gum chewing, and other repetitive habits. To treat MH, conservative or non-surgical therapies such as splint therapy and behavior therapy are recommended. Botulinum toxin type A (Botox) injection therapy is also an option, as it helps reduce muscle contractions and can lead to muscle atrophy. Muscle atrophy refers to the wasting or thinning of muscle mass, which can be caused by disuse or neurogenic conditions. In the case of the masseter muscle, botulinum toxin injections can induce muscular atrophy, reducing the volume of the muscle and leading to a slimmer, more V-shaped face. However, it is important to be cautious as there can be negative side effects, such as changes in facial expressions and sunken cheeks.
| Characteristics | Values |
|---|---|
| Cause of Muscle Atrophy | Disuse of muscles, neurogenic conditions, genetic disorders, stroke, ageing, injury, disease |
| Symptoms of Muscle Atrophy | Reduced muscle mass, weakness, numbness, tingling, trouble walking/balancing, difficulty swallowing/speaking, facial weakness, memory loss |
| Botulinum Toxin Injection | Causes muscular atrophy of up to 22%, with peak effects seen at 1-2 weeks, muscle bulk regained within 6 months |
| Botulinum Toxin Side Effects | Change in facial expression, sunken cheeks, facial paralysis, pain at injection site or during mastication, reduced salivary flow |
| Masseter Muscle Hypertrophy Treatment | Conservative management, surgical resection, botulinum toxin type A injection, splint therapy, behaviour therapy |
| Masseter Muscle Hypertrophy Causes | Emotional stress, chronic clenching/grinding, gum chewing, biting nails, tongue or objects, unconscious habits |
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Botox injections
Before receiving Botox injections, individuals typically consult a medical professional who examines their jaw and face to determine the injection site and the number of syringes needed. During the procedure, the medical professional will clean the skin to reduce the risk of infection and may use a topical anaesthetic. The syringe used for the injection will have a very thin needle.
Repeated Botox injections can lead to long-term damage to the masseter muscle. Ultrastructural damage can persist for up to six months after a single injection, and changes may become permanent with multiple injections. Additionally, Botox injections have been associated with bone loss and thinning of the jaw bone, which may be an unwanted side effect.
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Malnourishment
Malnutrition can lead to muscle atrophy, the wasting or thinning of muscle mass. It is important to note that malnutrition-related muscle atrophy is a severe health condition and should not be taken lightly.
Malnutrition can cause muscle atrophy by impairing muscle growth or maintenance. Diets low in lean protein, fruits, and vegetables can lead to muscle atrophy. Malnutrition can also cause muscle atrophy as a result of certain medical conditions that impair the body's ability to absorb nutrients. This includes cachexia, a complex metabolic condition that causes extreme weight loss and muscle atrophy. Cachexia often develops as a symptom of another underlying condition, such as cancer, HIV, or multiple sclerosis (MS). It is important to note that cachexia cannot be completely reversed with nutritional therapy alone.
Malnutrition can also lead to muscle atrophy through the process of sarcopenia. Sarcopenia is age-related muscle atrophy, where the body produces fewer proteins that promote muscle growth. This reduction in available protein causes muscle cells to shrink. While sarcopenia can be slowed by exercise, it is important to note that it is a natural part of the aging process and may not be entirely preventable.
In addition to malnutrition, muscle atrophy can also be caused by immobility, aging, certain medications, injuries, or diseases that impact the musculoskeletal or nervous system. It is important to consult a healthcare professional if you are experiencing any symptoms of muscle atrophy or malnutrition.
It is worth noting that the masseter muscle, which is responsible for chewing and elevating the lower jaw, can be subject to muscle atrophy. This can occur as a result of overworking the muscle through habits such as teeth clenching or grinding, chewing gum, or biting nails. However, the more common condition associated with the masseter muscle is hypertrophy, or enlargement, which can be treated with Botox injections or surgery.
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Lack of exercise
Sedentary lifestyles, desk jobs, and certain medical conditions can contribute to a lack of exercise and physical inactivity, increasing the risk of muscle atrophy. In the case of the masseter muscles, specific habits such as clenching or grinding the teeth, chewing gum, biting the tongue, or chewing on objects like pens can also lead to atrophy. These habits can be unconscious and develop due to increased stress in modern life. Over time, these repetitive actions can cause the masseter muscles to be overworked, leading to pain or hypertrophy (enlargement) of the muscle.
To prevent or reverse muscle atrophy due to lack of exercise, regular physical activity and a healthy diet are crucial. Exercises such as resistance training and water exercises can help improve muscle strength and mobility. Additionally, physical therapy and ultrasound therapy can aid in stimulating muscle activity and promoting healing. Maintaining a healthy diet and proper nutrition can also support muscle health and prevent atrophy.
In the case of masseter muscle atrophy, specific treatments such as splint therapy, behaviour therapy, and botulinum toxin (Botox) injections can be used to reduce muscle contractions and address overworked masseter muscles. However, it is important to consult with a healthcare professional before starting any treatment plan to ensure a proper diagnosis and effective approach.
While lack of exercise can contribute to muscle atrophy, it is important to note that other factors, such as age, genetics, and certain medical conditions, can also play a role in muscle wasting. Therefore, a comprehensive approach to maintaining muscle health should consider multiple factors and may involve various interventions.
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Neurotoxins
Botulinum neurotoxins (BoNTs) are paralytic agents used to treat a variety of conditions in jaw muscles. They are a lethal toxin produced by anaerobe C. botulinum, which is responsible for producing the disease of botulism. There are seven types of botulinum toxins, out of which only type A and B are commercially available for pharmacological uses. Botulinum toxin type A is a potent neurotoxin that binds permanently to the motor end-plate at the neuromuscular junction and blocks the release of acetylcholine from presynaptic vesicles. This results in muscular paralysis and subsequent atrophy.
The masseter muscle is commonly targeted by botulinum neurotoxins for facial contouring and the treatment of masseter hypertrophy (MH). MH is an uncommon disorder that can cause aesthetic and functional problems, such as a change in facial smiling expression, sunken cheeks, and facial muscle paralysis. The treatment of MH includes conservative management, surgical resection, and the injection of botulinum toxin type A, which offers a minimally invasive approach.
The injection of botulinum toxin type A into the masseter muscle has been shown to induce muscular atrophy of up to 22%, with a median reduction of 30.9% of masseter bulk reported in one study. The peak effect of the toxin is seen at 1-2 weeks, with the peak changes in lower facial contour obtained at 12 weeks. The use of ultrasonographic guidance has been found to be a more effective and safer approach for injecting botulinum neurotoxins into the masseter muscle, as it allows for the evaluation of the complex structure of the muscle and its intermingled muscle fibers.
It is important to note that there are potential side effects and complications associated with the use of botulinum neurotoxins. These include bruising, hematoma, headaches, dizziness, pain at the injection site, and altered facial expressions. Additionally, the possibility of persistent muscular deficits and cumulative tissue damage has been reported, even several months after treatment. Therefore, it is crucial to carefully consider the potential risks and benefits before undergoing any neurotoxin treatment.
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Emotional stress
Stress can affect the function of all the components of the masticatory system, leading to differentiated symptoms and, ultimately, systemic and structural dysfunctions. Emotional stress can cause tension and clenching of the jaw, leading to the overworking of the masseter muscles. This can result in either pain or hypertrophy of the muscle.
Additionally, psychological stress is known to attenuate body size and lean body mass. Studies have shown that acute daily psychological stress can induce atrophic gene expression and loss of muscle mass. This is thought to be a result of decreased food intake due to stress and increased secretion of glucocorticoids by the adrenal glands.
The effects of emotional stress on the masseter muscle can be addressed through behaviour therapy, relaxation techniques, stress management, and thermal therapy. It is important to learn to become aware of behavioural habits that may contribute to overworking the masseter muscles and to develop techniques to mitigate their effects.
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Frequently asked questions
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by disuse of muscles or neurogenic conditions.
Disuse atrophy can be caused by leading a sedentary lifestyle, malnourishment, not getting enough exercise, having a desk job, or old age. Neurogenic atrophy is caused by an injury or disease affecting nerves that connect to the muscles.
The masseter muscles are a set of powerful muscles used for chewing. Masseter muscle hypertrophy refers to the enlargement of the masseter muscle. This can be caused by emotional stress, chronic clenching or grinding, gum chewing, or simply a preference for chewing on one side. To cause atrophy in the masseter muscle, you can stop chewing gum, stop clenching and grinding your teeth, and adopt a softer diet.
Masseter muscle hypertrophy can be treated with conservative management, surgical resection of the enlarged muscle and/or bone, or injection of botulinum toxin type A (Botox).
