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Medical Emergencies · patient case question

What is the most likely cause of the whistling sound during his speech?

Patient case: Repaired Tetralogy of Fallot and an Anterior Diastema

Patient: 24-year-old male

Chief Complaint: “I whistle when I talk and I’d like to close the gap between my front teeth.”

Background: Tetralogy of Fallot repaired at age 3 using a prosthetic conduit. His cardiologist’s most recent report documents a residual peri-prosthetic leak immediately adjacent to the prosthetic patch material. No drug allergies. Otherwise healthy and asymptomatic.

Medications: None

Vital Signs: BP 118/72 mmHg · HR 74 bpm · RR 16 · T 98.4°F

Findings: A 4 mm maxillary midline diastema with no other spacing. Generalized moderate calculus with bleeding on probing; scaling and root planing is planned for this visit. Air escape is audible during sibilant sounds.

  1. An anterior open bite
  2. The maxillary midline diastema
  3. A high labial frenum attachment in isolation
  4. Reduced occlusal vertical dimension
Show answer and explanation

Correct answer: B. The maxillary midline diastema

  • A. Incorrect. An anterior open bite can affect speech, particularly the production of “s” and “th”, but the stem specifies a midline diastema with no other spacing and no vertical discrepancy.
  • B. Correct. During sibilant sounds the tongue directs a narrow stream of air against the lingual surfaces of the maxillary anterior teeth. A 4 mm gap in the midline allows air to escape forward through the space, producing an audible whistle. Closing the diastema resolves it.
  • C. Incorrect. A high frenum attachment may contribute to the persistence of a diastema, but the frenum itself does not obstruct or redirect airflow. The space is what produces the sound.
  • D. Incorrect. Reduced vertical dimension produces an aged facial appearance, angular cheilitis, and cheek biting. It does not cause air escape during sibilants.

Note: Worth remembering as a prosthodontic parallel: the same principle explains why excessive spacing between denture teeth, or an overly thick palatal contour, distorts sibilant sounds in a complete denture patient.

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