Most common reason to repeat impression is:

# Most common reason to repeat impression is?
a) Improper positioning of tray
b) Too less or excess material
c) Voids that are irreparable
d) Improper mixing

The correct answer is A. Improper positioning of tray.

The most common reason to repeat an impression is improper positioning of the impression tray. If the tray position is improper, the flange of the impression which lies on the side of deviation will be excessively thick and the flange of the impression opposite to the deviation will be thin.

The other reasons are improper consistency, large voids, movement of the tray during setting and too little or too much impression material.

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Relieving mid-palatine area in complete dentures

# The purpose of relieving mid-palatine area in complete dentures is to prevent:
a) Pressure on palate
b) Midline fractures in dentures
c) Incorrect centric relation
d) Resorption of bone

The correct answer is A. Pressure on palate.

Mid palatine raphe is the median suture area covered by a thin submucousa and the mucosa layer is practically in contact with the underlying bone. For the reason the soft tissue covering the median palatal sutures is non resilient and may need to be relived to avoid trauma from the denture base.

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Maxillary canine missing FPD

# In a case where maxillary canine is missing and we have to make a tooth-supported FPD, the abutment will be:
a) Central incisor, Lateral incisor and 1st premolar
b) Lateral incisor, 1st premolar 2nd premolar
c) Lateral incisor and 1st premolar
d) It depends upon periodontal status of remaining teeth

The correct answer is A. Central incisor, lateral incisor and first premolar.

Missing maxillary canine or mandibular canine (one tooth) come under complex fixed partial dentures and central incisor, lateral incisor and 1'1 premolar acts as abutments, whereas for other teeth(incisors, premolars and molars) the adjacent teeth in relation to the missing tooth are enough

to act as abutments.

FPD replacing canines can be difficult because the canine often lies outside the inner abutment axis.

An edentulous space created by the loss of a canine and any two contiguous teeth is best restored with a RPD.

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The posterior tooth that gives a better support is:

# The posterior tooth that gives a better support is:
a) With convergent roots
b) Divergent roots
c) Conical roots
d) Curved roots

The correct answer is B. Divergent roots.

- Roots with greater labiolingual width than mesiodistal width are preferable to roots that are round in cross section.

• Long, irregularly shaped and divergent roots offer great support.

• Short, conical and blunted roots offer poor support.

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