Posterior Palatal Seal

# Excess height of the posterior palatal seal of a complete maxillary denture will usually result in which of the following?
A. Increased retention
B. A tingling or tickling sensation
C. Unseating of the denture
D. Gagging

The correct answer is C. Unseating of the denture.

Over contouring or excessive beading of the posterior palatal seal causes too much pressure to be exerted on the palatal tissues resulting in the unseating of upper dentures. 

The posterior palatal seal is typically placed approximately on the vibrating line between the hard and soft palate and provides a physiologically acceptable tissue pressure within the compressible portion of the soft palate to attain retention and peripheral seal. 

Over extending the coverage of seal will cause gaggling and painful swallowing for the part of the patient. 

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Vertical Dimension of Occlusion (VDO)

# A denture that is fabricated with excessive Vertical Dimension of Occlusion (VDO) may result in:
A. Inefficient mastication
B. Perioral rhytides (wrinkles)
C. Trauma to supporting soft tissue
D. Sagging oral commissures

The correct answer is C. Trauma to supporting soft tissue. 

Perioral rhytides, sagging oral commisures and deep labiomental groove is an indication that the vertical dimension of occlusion is insufficient. 

Excessive vertical dimension of occlusion (VDO) causes pain in the soft tissue under the denture because excessive force is created during occlusion. 

Excessive VDO manifests as a "full mouth" as well as a difficulty pronouncing words. 

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Most Sensitive to X Ray

# Which of the following are most sensitive to X ray?
A. Tooth buds and salivary glands
B. Nerve and muscle tissue
C. Hair and nails
D. Cartilage

The correct answer is A. Tooth buds and Salivary glands

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Non keratinized gingival tissue

# Which of the following is an example of non keratinized gingival tissue?

A. Outer gingival epithelium 

B. Gingival col

C. Marginal gingiva 

D. Attached gingiva

The correct answer is B. Gingival col.

The gingival tissue is made up of 75% Para keratinized epithelium, about 15 % keratinized and only 10% non keratinized epithelium.

The keratinized area of the gingiva includes the attached gingiva and some portions of the outer gingival epithelium. 

The para keratinized gingiva includes the marginal gingiva and portions of the outer gingival epithelium.

The non keratinized portion of gingiva includes the gingival col, junctional epithelium and sulcular epithelium.

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