Tongue thrust

Introduction

Tongue thrust, also known as reverse swallow or immature swallow, is a term used to describe a specific tongue movement pattern. The understanding and interpretation of tongue thrust varies among professionals, leading to different perspectives on its classification and implications.

Illustration depicting the action of tongue thrusting.

Definition and Characteristics

Tongue thrust refers to the action where the tongue pushes against or protrudes between the front teeth during swallowing, speech, or while the tongue is at rest.

Adaptive Lip Seal Mechanism

Some professionals regard tongue thrust as a normal adaptive lip seal mechanism, essential for:

• Nasal breathing: Facilitating unobstructed airflow through the nasal passages.
• Normal swallowing: Ensuring efficient and safe swallowing without choking or aspiration.

Oral Myofunctional Disorder

Alternatively, tongue thrust is sometimes perceived as an oral myofunctional disorder. In this context, it's seen as:

• A disruptive tongue muscle pattern.
• Clinically abnormal, particularly when the tongue consistently protrudes anteriorly, often between the teeth, to seal lips that might not close properly on their own.

Diagram showing the oral myofunctional disorder and its impact on dental alignment.

Clinical Implications

Persisting tongue thrust beyond the neonatal period can have several implications:

• Dental Malocclusion: The consistent forward pressure of the tongue can lead to dental misalignment or maintain an already existing open bite.
• Speech Difficulties: Tongue thrust can interfere with articulation, affecting the clarity of speech.
• Digestive Issues: Improper swallowing may impact the initial stages of digestion.

Differing Professional Views

The existence of multiple perspectives on tongue thrust stems from varying clinical observations and research interpretations. This has led to:

• Different treatment recommendations: Ranging from no intervention for those seeing it as a natural mechanism, to speech or occupational therapy for those viewing it as a disorder.
• Varied clinical practices: While some professionals might recommend orthodontic or therapeutic interventions, others might adopt a wait-and-watch approach.

Conclusion

Tongue thrust, as a phenomenon, exists at the intersection of dental, speech, and occupational therapies. Its interpretation varies, leading to different clinical approaches. Regardless of perspective, it's crucial for healthcare professionals to be informed, collaborate across disciplines, and ensure that patients and their families understand the condition and any proposed interventions.