Impaired mandibular function in spinal muscular atrophy type II: need for early recognition

Area of Science:

• Neurology
• Pediatrics
• Dentistry

Background:

• Spinal muscular atrophy type II (SMA II) is a severe genetic disorder affecting motor neurons.
• Mandibular function is critical for essential activities like eating and speaking.
• Limited research exists on the specific impact of SMA II on mandibular function in young patients.

Purpose of the Study:

• To evaluate mandibular function in pediatric and young adult patients diagnosed with SMA II.
• To identify the prevalence and severity of mandibular impairments in this population.
• To explore the correlation between disease severity and mandibular dysfunction.

Main Methods:

• A case-control study involving 12 patients with SMA II and 12 age- and sex-matched healthy controls.
• Assessment of mandibular function, including mouth opening range and temporomandibular joint (TMJ) movement.
• Correlation analysis between motor function measure scores and observed mandibular limitations.

Main Results:

• 50% of SMA II patients exhibited moderate to severe mandibular dysfunction.
• 75% of patients presented with limited mouth opening (≤30 mm).
• Severe mouth opening limitation in SMA II patients was associated with TMJ rotation rather than normal rotation-sliding mechanics.
• Limited active mouth opening correlated significantly with overall disease severity.

Conclusions:

• Mandibular dysfunction is a prevalent issue in young individuals with SMA II.
• Impaired mandibular function in SMA II can affect chewing and potentially lead to aspiration.
• Early identification and management of mandibular dysfunction are recommended to mitigate associated health risks.