MCQs on Complete Dentures : Impression Procedures


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# In making a final impression for a complete denture, the most important area of the impression is :
A. Ridge area of maxilla and buccal shelf of mandible
B. Lingual border area of mandible
C. Junction of hard and soft palate of maxilla and distolingual area of mandible
D. Mid palatal area of maxilla and ridge of the mandible

# The stabillity of a mandibular complete denture will be enhanced when:
A. the level of occlusal plane is above the dorsum of the tongue
B. the tongue rests on the occlusal surface
C. the lingual contour of the denture is concave
D. the posterior teeth on the denture have a broad buccolingual width


# The primary stress bearing area of maxillary complete denture is:
A. Alveolar ridge
B. Buccal flange
C. Palate
D. Posterior palatal seal area

# The mean denture bearing area of edentulous mandible and maxillla respectively is:
A. 14 cm2 and 24 cm2
B. 24 cm2 and 14 cm2
C. 14 mm2 and 24 mm2
D. 24 mm2 and 14 mm2

# While taking impression of flabby fibrous tissue on maxillary ridge for complete denture care is taken to:
A. Use a tray with spacer
B. Not maintain intimate contact with tissues
C. Use a close fitting tray
D. Following normal procedures

# In primary impression, the stock tray should be _____ mm larger than ridge.
A. 2 mm
B. 4 mm
C. 6 mm
D. 8 mm


# Passive impression technique involves:
A. Impression with silicone
B. Impression compound
C. Impression plaster
D. Alginate

# Primary stress bearing area in mandibular edentulous ridge is :
A. Buccal shelf
B. Crest of the ridge
C. Retromolar pad
D. Lingual flange

# Vomitting during impression making procedures may be prevented by :
A. Sedating the patient
B. Injecting local anesthetic
C. Asking patient to come empty stomach
D. Changing the impression material

# Retromolar pad :
A. Should not be covered by lower denture
B. Should be covered by lower denture
C. Has tendon of temporal muscle attached to it
D. Disappears on eruption of mandibular last molars

# Which material is used in a custom tray?
A. High fusing compound
B. Reversible hydrocolloid
C. Metallic oxide paste
D. Irreversible hydrocolloid

# The following property of saliva affect denture retention :
A. Quality and quantity of serous and mucous saliva
B. Quantity of mixed saliva
C. Quantity of only serous saliva
D. None of the above

# How should the lingual extension of the mandibular impression be tested ?
A. By functional movements of the facial muscles
B. By vigorous extreme movements of the tongue
C. By functional movements of the tongue
D. By lateral and protrusive movement of the mandible

# The relationship of the denture base that resists dislodgement of denture in horizontal direction is :
A. Stability
B. Pressure
C. Support
D. Retention

# Denture bearing area of the ridge is :
A. Non keratinized
B. Keratinized
C. Para keratinized
D. None of the above
# The thickness of the spacer used in special tray is :
A. 2.5 mm
B. 2.0 mm
C. 1.5 mm
D. 1.0 mm

# The main purpose of covering the retromolar pad area is:
A. Stability
B. Retention
C. Support
D. Contraction

# Selective pressure impression technique is indicated in :
A. Firm healthy mucosal covering over the ridge
B. Flabby ridges
C. Knife edge with movable mucosa
D. When sharp bony spicules are present over the ridge

# Emergency retentive force is :
A. Atmospheric pressure
B. Surface tension
C. Cohesion
D. Adhesion

# An important factor that aids in stability of complete denture is :
A. Harmonious occlusion
B. Proper extension of denture bases
C. Polishing of denture bases
D. None of the above

# To make an impression of hyperplastic tissue, one should:
A. Use wax for impression
B. Use elastomeric impressions to displace the tissues
C. Ensure intimate contact of impression material to the tissue
D. Use especially fitted tray

# The zinc oxide eugenol impression paste is used to enhance quality of:
A. Modeling compound impression
B. Reversible hydrocolloid impression
C. Alginate impressions
D. Wax impressions

# Muscle which has influence in the formation of buccal frenum of maxilla:
A. Levator anguli oris
B. Quadratus labii superioris
C. Triangularis
D. Inferioris

# Atmospheric pressure as a factor of retention is effective only:
A. if saliva is present
B. if adequate peripheral seal is present
C. if principle of mucostatics is applied
D. if good neuromuscular coordination is present

# The purpose of boxing an impression is:
A. Boxing preserves the border width after border moulding
B. To serve as a base for cast poured
C. Both A and B
D. None of the above


# If a complete denture patient has genial tubercle at the level of the crest of mandibular ridge, the denture base:
A. can cover them
B. should not cover them
C. should cover them and relief is a must
D. should cover them but relief is not necessary

# The masseteric notch in distobuccal corners of the mandibular denture is due to:
A. action of buccinator on masseter
B. action of masseter on buccinator
C. action of palatoglossus on buccinator
D. action of superior constrictor on masseter