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BDS1 Tooth Morphology > Premolars > Flashcards

Premolars Flashcards

1
Q

What is the palatal surface of an upper first premolar like compared to the buccal surface?

A

Slightly lower and much narrower

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2
Q

What is the distal surface of an upper first premolar like?

A

Very convex

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3
Q

What is the mesial surface of an upper first premolar like?

A

Convex only in its occlusal half, its cervical half is very concave

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4
Q

What is the canine fossa?

A

The concavity that continues on to the cervical region of the root
- This is the surface which contacts the distal surface of the upper canine

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5
Q

What is a distinguishing feature of the upper first premolar?

A
  • A well-defined developmental groove in the enamel of the mesial marginal ridge
  • This groove is in alignment with the developmental depression on the mesial surface of the root but is not usually connected with it
  • The groove continues with the central groove of the occlusal surface
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6
Q

What shape is the occlusal surface of the upper first premolar?

A
  • Roughly oval
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7
Q

Which cusp of the upper first premolar is wider and higher than the other cusp?

A

The buccal cusp

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8
Q

Which cusp shows a marked mesial displacement?

A

The lingual cusp

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9
Q

What are the 2 cusps of the upper first premolar joined by?

A

Marginal ridges, of which the mesial is higher

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10
Q

What are the features of the sharp fissure running mesio-distally on the occlusal surface of an upper first premolar?

A
  • Does not reach the distal marginal ridge but often extends across the mesial marginal ridge on the mesial surface
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11
Q

How many roots does an upper first premolar have?

A
  • Over 50% of upper first premolars have 2 roots, one buccal and one lingual
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12
Q

Where is the bifurcation of the roots on an upper first premolar?

A

A variable distance from the cervical margin

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13
Q

Which surface of the root of an upper first premolar is more deeply grooved than the other surface and shows concavity in the cervical region?

A

The mesial surface

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14
Q

Which part of the root of an upper first premolar usually has a marked distal curvature?

A

The apical part

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15
Q

What is the upper second premolar like compared to the upper first premolar?

A
  • Usually smaller
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16
Q

What are the 2 cusps of an upper second premolar like?

A
  • Usually similar in width and height, due tot the reduction in size of the buccal cusp
17
Q

Is there a developmental depression evident on the mesial surface of the crown of an upper second premolar?

A

no, however the mesial surface of the crown is convex

18
Q

Which cusp of the upper second premolar has slight mesial displacement?

A

The lingual cusp

19
Q

How many roots does an upper second premolar usually have?

A
  • Only 15% have 2 roots, although the single root is usually deeply grooved
20
Q

Does the sharp fissure on the occlusal surface of the upper second premolar reach the marginal ridges?

A

No

21
Q

What way is the buccal surface of a lower first premolar inclined?

A
  • Inclined strongly lingually
22
Q

What is the lingual surface of a lower first premolar like compared to the buccal surface?

A
  • Slightly narrower and much lower than the buccal surface
23
Q

What is the occlusal surface of a lower first premolar like?

A
  • Almost round
24
Q

Which cusp of a lower first premolar is displaced distally?

A
  • Lingual
25
Q

What is the crown of a lower second premolar like compared to a lower first premolar?

A

Much larger than that of the first

26
Q

What is the occlusal surface of a lower second premolar like?

A
  • The lingual cusp is much larger than that of the first and displaced mesially
27
Q

How many lingual cusps does a lower second premolar have?

A

There may be 2 lingual cusps, if so, the mesial cusp is larger

28
Q

Which fossa on the occlusal surface of a lower second premolar is generally larger?

A

The distal fossa

29
Q

Which marginal ridge of the lower second premolar is more cervical?

A

Distal marginal ridge

30
Q

What does unilateral mean?

A

Affecting only one side

31
Q

What does bilateral mean?

A

Affecting both sides

32
Q

What does ipsilateral mean?

A

Belonging to or occurring on the same side of the body

33
Q

What does contralateral mean?

A

Occurs on the opposite side of the body

BDS1 Tooth Morphology (5 decks)

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