Canine placement

# Canine placed anterior to the orbital plane:
a) Protraction
b) Abstraction
c) Attraction
d) Expansion

The correct answer is A. Protraction.

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ANB Angle Cephalogram

# An ANB angle 2 ° on the cephalogram usually indicates:
a) An unfavorable relationship of mandible to maxilla
b) A favorable relationship of maxillary alveolar base to mandibular alveolar base
c) Poor cranial growth with poor prognosis
d) Retruded maxillary incisor

The Correct answer is B. A favorable relationship of maxillary alveolar base to mandibular alveolar base.

SNA angle relates maxilla to the cranial base. The mean value is 82°. A Larger value indicates prognathic maxilla while a smaller value is suggestive of retrognathic maxilla.

SNB angle relates mandible to cranial base. Its average value is 80°. Larger values indicate prognathic mandible while smaller values indicates retrusive mandible.

AN B angle denotes the relative position of maxilla and mandible to each other. Mean value is 2° .

An increase in this angle indicates class-II skeletal tendency while an angle that is Less than normal or a negative angle is suggestive of a skeletal classIII relationship.

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Frankfort's horizontal plane

# Frankfort's horizontal plane is formed by joining:
a) Porion and Orbitale
c) Porion and sella
b) Nasion and se lla
d) Porion and Nasion

The correct answer is A. Porion and Orbitale.

FHP or Frankfort horizontal plane =  Formed by joining Porion and orbitale
SN plane or anterior cranial base = Formed by joining nasion and sella
Cranial base length = Nasion and Bolton line
Upper facial height = Nasion to ANS (anterior nasal spine)
Lower facial height = ANS to menton
Total facial height = Nasion to menton

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Prolonged retention of primary tooth

# Prolonged retention of primary tooth may lead to
a) Altered path of permanent tooth eruption
b) Root resorption of adjacent tooth
c) Ankylosis of permanent tooth
d) Warping of roots of adjacent teeth

The correct answer is A. Altered path of permanent tooth eruption.

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