Premolar Comparisons Flashcards

1
Q

Maxillary buccal view: crown symmetry

A

Greater symmetry on maxillary 2nd premolar

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2
Q

Maxillary buccal view: occlusal-cervical dimension

A

Larger on maxillary 1st premolar

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3
Q

Maxillary buccal view: cervical width

A

Wider cervical neck on maxillary 2nd premolar

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4
Q

Maxillary buccal view: buccal cusp sharpness

A

Sharper on maxillary 1st premolar

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5
Q

Maxillary buccal view: buccal cusp ridge lengths

A

Mesial cusp ridge on maxillary 1st premoler is longer

Mesial cusp ridge on maxillary 2nd premolar is shorter

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6
Q

Maxillary buccal view: buccal cusp ridge depressions

A

More often found on maxillary 1st premolar

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7
Q

Maxillary buccal view: buccal ridge prominence

A

More prominent on maxillary 1st premolar

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8
Q

Maxillary mesial view: cusp height difference

A

Larger on maxillary 1st premolar

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9
Q

Maxillary mesial view: mesial crown concavity

Note its significance

A

Present on maxillary 1st premolar (good place for bacteria deposit –> cavities)

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10
Q

Maxillary mesial view: mesial marginal ridge groove

A

Present on maxillary 1st premolar

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11
Q

Maxillary mesial view: number of roots

A

Maxillary 1st premolar = 2 (buccal and pharyngeal)

Maxillary 2nd premolar = 1 root

(Important to know for root canals)

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12
Q

Maxillary mesial view: developmental root depression

Give the significance of this morphology

A

Deeper on maxillary 1st premolar (can be area for caries)

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13
Q

Occlusal view: outline form

A

More rounded on maxillary 2nd premolar

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14
Q

Maxillary occlusal view: lingual cusp displacement

A

Greater mesial displacement of lingual cusp on maxillary 1st premolar

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15
Q

Maxillary occlusal view: mesial surface convexity

A

Greater on maxillary 2nd premolar

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16
Q

Maxillary occlusal view: buccal ridge prominence

A

More prominent on maxillary 1st premolar

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17
Q

Maxillary occlusal view: mesial marginal ridge groove

A

Present on maxillary 1st premolar

18
Q

Maxillary occlusal view: central developmental groove lengths

A

Slightly longer on maxillary 1st premolar

19
Q

Maxillary occlusal view: marginal ridge width

A

Wider on maxillary 2nd premolar

20
Q

Maxillary occlusal view: location of pits

A

Maxillary 1st premolar = closer to marginal ridges

Maxillary 2nd premolar = closer to center of tooth

21
Q

Maxillary occlusal view: mesio-buccal and disto-buccal line angles

A

More prominent and angular on maxillary 1st premolar

22
Q

Mandibular buccal view: occlusal cervical crown dimension

A

Greater on mandibular 1st premolar

23
Q

Mandibular buccal view: buccal cusp height

A

Greater on mandibular 1st premolar

24
Q

Mandibular buccal view: buccal cusp sharpness

A

Greater on mandibular 1st premolar

25
Q

Mandibular lingual view: llingual cusp heights

A

Greater on mandibular 2nd premolar

26
Q

Mandibular lingual view: occlusal surface visibility

A

Greater on mandibular 1st premolar

27
Q

Mandibular lingual view: lingual groove presence

A

Present on mandibular 2nd premolar with 3 cusps (1 buccal, 2 lingual)

28
Q

Mandibular lingual view: marginal ridge positions

A

1st premolar = mesial is more cervical than distal

2nd premolar = distal is slightly more cervical than mesial

29
Q

Mandibular mesial view: lingual cusp heights

A

Greater on mandibular 2nd premolar

30
Q

Mandibular mesial view: buccal cusp locations

A

2nd premolar = slightly more buccal

31
Q

Mandibular mesial view: marginal ridge angulations

A

1st premolar = lingual slope

2nd premolar = horizontal

32
Q

Mandibular mesial view: mesio-lingual groove

A

Present on mandibular 1st premolar (do not confuse with 2nd premolar lingual groove)

33
Q

Mandibular mesial view: difference in cusp heights

A

Greater on mandibular 1st premolar

34
Q

Mandibular mesial view: occlusal surface visibility

A

Greater on mandibular 1st premolar

35
Q

Mandibular occlusal view: number of cusps

A

1st premolar = 2 cusps

2nd premolar = 2 or 3 cusps

36
Q

Occlusal view: bucco-lingual crown dimension

A

Greater on mandibular 2nd premolar

37
Q

Mandibular occlusal view: crown outline form

A

1st premolar = diamond shaped

2nd premolar = square or oval

38
Q

Mandibular occlusal view: pits locations

A

1st premolar = mesial and distal

2nd premolar = mesial, distal and central

39
Q

Mandibular occlusal view: occlusal table size

A

Larger on mandibular 2nd premolar

40
Q

Mandibular occlusal view: developmental groove form

A

1st premolar = straight line

2nd premolar = Y-shaped

41
Q

Tooth numbers of premolars

A

maxillary premolars = 1.5, 1.4, 2.4, 2.5

mandibular premolars = 3.5, 3.4, 4.4, 4.5