Dentosphere : World of Dentistry

# Canine placed anterior to the orbital plane: a) Protraction b) Abstraction c) Attraction d) Expansion The correct answer is A. Protraction. CLICK HERE FOR MORE MCQs

# 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 ...

# 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 CLICK HERE FOR MORE MCQs.

# 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. CLICK HERE FOR MORE MCQs.