Prosthodontics & Occlusion · single question
When taking an impression of the lower arch, the posterior denture tissue type as the posterior border ends is:
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Correct answer: C. Non-keratinized and minor salivary glands
The posterior border of the maxillary complete denture (posterior palatal seal/post-dam) terminates at the vibrating line. This area consists of non-keratinized mucosa overlying minor salivary glands (in the soft palate). This tissue is compressible and allows for a peripheral seal. The non-keratinized tissue with glands is softer and more adaptable than keratinized or bony tissue.
- A. INCORRECT. Major salivary glands (parotid, submandibular, sublingual) are not located in this region, and the tissue here is not keratinized.
- B. INCORRECT. Cancellous bone is not encountered at the posterior denture border. The hard palate (anterior) is underlaid by cortical bone, but the posterior border is in the soft palate territory.
- C. CORRECT. The posterior border of the complete denture terminates at the vibrating line (soft palate region), which contains non-keratinized mucosa overlying minor salivary glands. This tissue is compressible and accommodates the posterior palatal seal.
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