Prosthodontics & Occlusion · single question
Which patient movement is most important to include when border-moulding the LABIAL flange of a maxillary complete denture impression?
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Correct answer: D. Puckering the lips
- A. Wide opening moulds the DISTOBUCCAL flange of the maxillary impression, where the coronoid process passes — but it does not shape the labial flange.
- B. Tongue protrusion moulds the lingual flange of a mandibular impression.
- C. Swallowing is used to mould the posterior lingual region of a MANDIBULAR impression and the retromylohyoid area, not the maxillary labial flange.
- D. CORRECT. PUCKERING (pursing) the lips activates orbicularis oris and the muscles of facial expression that insert into the labial vestibule, which moulds the anterior labial flange to its correct functional extension. An overextended labial flange displaces the denture whenever the patient smiles, speaks or pursesd the lips.
Note: The maxillary border-moulding sequence: labial flange — pucker and pull the lip down and out; buccal flange — pull the cheek out, down and inward with a rotary motion and have the patient move the jaw side to side; distobuccal — wide opening plus lateral excursions for the coronoid process; posterior — the 'ah' sound for the vibrating line.
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