oral anatomy Mcqs
1. Which of the following muscle helps in depressing the mandible ___________?
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A. Lateral pterygoid

B. Temporalis

C. Medial pterygoid

D. Massetor

2. Primary teeth differ from permanent teeth in following aspects ?
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A. Thickness of enamel and dentin

B. All of the above

C. Pulp chambers are longer

D. Roots are flaring

3. Mesiodistal width is more than cervico- incisal length of crown in_____________?
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A. Permanent mandibular lateral incisors

B. Permanent central incisors

C. Decidous maxillary central incisors

D. Permanent maxillary canines

4. In which of the following areas is the alveolar process the thinnest_____________?
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A. Lingual to the mandibular first molar

B. Buccal to the mandibular central incisors

C. Lingual to the maxillary canines

D. Lingual to the maxillary central incisors

5. A radiograph of 4- years old child reveals no evidence of calcification of mandibular second pre molar. This indicates______________?
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A. Primary second molar extracted to allow mesial drifting of permanent first molar

B. It is too early to make final predication

C. The child may never develop premolars

D. The teeth may develop later
6. The primary teeth that present the most outstanding morpholgic deviations from permanent teeth are______________?
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A. Central incisors

B. Canines

C. Mandibular first molar

D. Mandibular second molar

7. Difference between primary and permanent enamel is_______________?
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A. In prism arrangement

B. None of the above

C. No difference in enamel, difference in dentin

D. in mineral content

8. Which of the following decidous molars bears the greatest resemblance to a premolar _____________?
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A. Mandibular second

B. Maxillary second

C. Mandibular first

D. Maxillary first
9. How many cusps does the crown of the maxillary first primary molar have ?
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A. 4

B. 5

C. 3

D. 2

10. Desmodont is another name for_____________?
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A. periodontal ligament

B. Dehiscence

C. The tooth with one wall pocket

D. Tooth with three walled pocket

11. In normal occlusion , with which grooves / surface of the permanent mandibular first molar does the mesiobuccal cusp of the permanent maxillary first molar occlude______________?
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A. Distobuccal groove

B. Mesial surface

C. Transverse groove

D. Mesiobuccal surface
12. What is the thickness of the layer of primsless enamel found in primary teeth_____________?
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A. 50?m

B. 75?m

C. 25 ?m

D. 100?m

13. Eruption date of decidous maxillary 2nd molar is ______________?
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A. 20 months

B. 18 months

C. 28 months

D. 24 months

14. Group function occlusion is common in_____________?
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A. Above 30 years

B. 15 -25 years

C. Edentulous patients

D. 10 14 years

15. Kalu, a 6- years old child, received tetracycline. Noticeable discoloration will be seen in______________?
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A. Canines, premolars and2nd molars

B. Incisors and 1st molars

C. Canine and 2nd molars

D. Premolars, incisors and 1st molars

16. The premolar alveoli are what shape in cross section_____________?
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A. Triangular

B. Rectangular

C. Oval

D. Kidney shaped
17. When viewed occlusally, a primary mandibular second molar closely resembles which of the following mandibular teeth ?
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A. Permanent first molar

B. Permanent second molar

C. Second premolar

D. Primary first molar

18. The first permanent tooth to erupt in the oral cavity is the_____________?
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A. Mandibular first molar

B. Mandibular central incisor

C. Maxillary central incisor

D. Maxillary first molar

19. In occlusion the teeth have_______________?
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A. Surface to surface contact

B. Edge to edge contact

C. Cusp to cusp contact

D. Marginal contact

20. Primary canine erupts______________?
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A. After D

B. Before B

C. After B

D. After E

21. The first evidence of calcification of primary anterior teeth begins approximately between ______________?
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A. 9 to 12 weeks in utero

B. 6- to 9 weeks in utero

C. 17 to 20 weeks in utero

D. 14 to 17 weeks in utero
22. Cervical bulge. True is____________?
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A. Enamel rods at cervical region directed occlusally

B. All of the above

C. Is characteristic of decidous teeth

D. Results in constriction at cervical region

23. Resorption of root of primary incisors starts at_____________?
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A. 8 yrs

B. 6 yrs

C. 4 yrs

D. 10 yrs

24. Retrusion of mandible is achieved by _______________?
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A. Temporalis

B. Masseter

C. None of the above

D. Lateral pterygoid

25. When a molar has no opposing tooth, it can become_______________?
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A. Protruded

B. Intruded

C. Retruded

D. Extruded
26. Which of these teeth are highly sturdy and usually the last ones to be lost ?
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A. Canines

B. Premolars

C. First molar

D. Central incisors

27. First evidence of initiation of primary dentition is usually around_____________?
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A. Birth

B. 4 months after birth

C. One year after birth

D. 4 months in utere
28. Number of teeth seen on X- ray at birth_______________?
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A. 22

B. 20

C. 30

D. 24
29. The highest ( longest ) and sharpest cusp on the decidous mandibular first molar is____________?
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A. Distolingual

B. Mesiobuccal

C. Distobuccal

D. Mesiolingual
30. Forward moment of mandible is done by_________?
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A. Medial pterygoid

B. Temporalis anterior fibers

C. Lateral pterygoid

D. Temporalis- posterior fibers

31. The direction of enamel rods in decidous teeth is_____________?
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A. Inclined in an apical direction in the cervical third of crown

B. Same as permanent teeth

C. Inclined in an occlusal direction in the cervical third of crown

D. None of the above

32. Generally in majority of children, the sequence of eruption of permanent teeth in mandible is____________?
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A. 6-1-2-4-5-3-7-8

B. 1-6-2-3-5-4-7-8

C. 6-1-2-4-3-5-7-8

D. 6-1-2-3-4-5-7-8
33. First permanent molars begin to calcify at ______________?
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A. About 1 year after birth

B. At birth

C. Before decidous incisors

D. 6 months of intra utrerine life

34. The most common sequence of eruption of the permanent maxillary teeth in children is_______________?
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A. 2-3-1-6-7-5-4-8

B. 6-1-2-4-3-5-7-8

C. 1-6-2-3-4-7-5-8

D. 6-1-2-3-4-5-7-8

35. The usual order of appearance of the primary teeth in the mouth is____________?
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A. Central incisors, lateral incisors, first molars canines, second molars

B. Central incisors, lateral incisors, first molars second molars, canines

C. Central incisors, lateral incisors, canines, second molars, first molars

D. Central incisors, first molars, lateral incisors, second molars, canines

36. Calcification of third molar begins at__________________?
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A. 8 years

B. 16 years

C. 18 months

D. 8 months

37. With respect to their permanent successors the sum of the mesidodistal diameters of the first and second decidous molar is generally ____________?
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A. Not related

B. Less

C. Greater

D. The same

38. The key to occlusion is_______________?
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A. Maxillary permanent second molar

B. Maxillary primary second molar

C. Maxillary primary first molar

D. Maxillary permanent first molar
39. Roots of primary and secondary teeth are different in that the primary roots are more divergent and flaring. The other difference _____________?
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A. Primary roots show less a accessory and lateral canals

B. Primary roots are shorter

C. Primary roots resorb more easily

D. None of the above

40. The eruption are of maxillary permanent lateral incisor is_____________?
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A. 8-9 years

B. 8-9 months

C. 10-11 years

D. 6-7 years

41. The sharpest cusp of primary first molar tooth is____________?
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A. Mesiolingual

B. Mesiobuccal

C. Distolingual

D. Distobuccal

42. A six- year molar begins to calcify at______________?
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A. 1 years after birth

B. Six months IU

C. At birth

D. 3 years age

43. The last primary tooth to be replaced by a permanent tooth is usually the_____________?
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A. Mandibular canine

B. Maxillary canine

C. Maxillary second molar

D. Mandibular second molar

44. Which muscle is responsible for translation of condyle ?
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A. Lateral pterygoid

B. Medial pterygoid

C. Superior constrictor of pharynx

D. Masseter

45. Facial occlusal line in the maxillary arch is formed by_______________?
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A. Non- supporting cusps

B. Supporting cusps

C. Stamp cusps

D. Centric holding cusps

46. Which statement is correct about decidous dentition?
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A. The primary dentition is initiated at 10<sup>th</sup> month in uterus

B. Mandibular first molar erupts at one and half years of age

C. The crowns of primary dentition are more yellowish than permanent

D. Calcification of maxillary primary first premolar is completed at birth

47. At birth the following teeth are calcifying____________?
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A. Primary canines & second molars

B. Primary incisors & first molar

C. Permanent 3rd molar

D. Permanent canines

48. Calcification of all teeth except last molars are completed by____________?
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A. 8 years

B. 4 years

C. 6 years

D. 2 years

49. The crowns and roots of primary molar at their cervical portions are more____________?
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A. Buliker anteroposteriorly

B. Bulkier mesiodistally

C. Slender mesiodistally

D. Slender anteroposteriorly

50. Which of the following is true about calcification of teeth ?
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A. Calcification of all primary teeth and few permanent teeth complete at birth

B. Calcification of primary teeth starts around birth

C. Calcification of primary teeth is almost complete at time of birth

D. Calcification of all permanent teeth complete at birth