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Restorative dentistry > Mandibular Premolars (permanent) > Flashcards

Mandibular Premolars (permanent) Flashcards

1
Q

Which mandibular permanent premolar is smaller / bigger?

A

Mandibular first premolar is smaller than mandibular second premolar.

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2
Q

What is the relationship of the lingual and facial cusp on a mandibular premolar?

A

Facial cusp is much bigger than lingual cusp

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3
Q

In comparison to maxillary premolars are the mandibular premolars more or less similar?

A

Mandibular premolars are less similar (they have more distinguishing features)

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4
Q

What are the Universal numbers of the mandibular first premolar?

A

21 (left)

28 (right)

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5
Q

From the facial view, what is the shape (not geometrical) of the mandibular first premolar?

A

Pentagonal

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6
Q

From the facial view, what is the geometrical shape of the mandibular first premolar? which way does it taper?

A

Facial View –> Trapezoidal / tapering cervically

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7
Q

Which two teeth in the entire mouth have similar HOC (medial & distal)

A

Mandibular Central and Mandibular first premolar

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8
Q

Where is the mesial & distal HOC on a mandibular first premolar?

A

M-HOC & D-HOC are both at middle third

Distal may be slightly occlusal

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9
Q

Which cusp on a mandibular first premolar is longer / shorter?

A

MB cusp is shorter

DB cusp is longer

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10
Q

Which premolar has the most variable lingual cusp?

A

mandibular first premolar

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11
Q

What feature is found on a mandibular first premolar that is between the mesial marginal ridge and the Lingual Cusp?

A

Mesial marginal groove

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12
Q

What is the geometric shape of a mandibular first premolar from a proximal view?

A

Rhomboidal

Inclined lingually

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13
Q

Where is the buccal cusp tip in relationship to the root on a mandibular first premolar from a proximal view?

A

Buccal cusp tip on a mandibular first premolar is centered over root midline (mandibular second premolar is not)

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14
Q

Where is the lingual cusp tip in relationship to the root on a mandibular first premolar from a proximal view?

A

Lingual cusp tip is centered over lingual root surface with the tip slightly more lingual

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15
Q

From mesial view, at what angle is the mesial marginal ridge inclined on a mandibular first premolar ?

A

Mesial Marginal ridge on a mandibular first premolar is inclined 45 degrees?

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16
Q

From proximal view, which marginal ridge is more cervical in a mandibular first premolar?

A

Mesial marginal ridge is more cervical than the distal marginal ridge in a mandibular first premolar

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17
Q

What is the general view of mesial and distal marginal ridges on premolars?

A

Generally, distal marginal ridge is more cervical than mesial marginal ridge (exception is mandibular first premolar )

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18
Q

What groove is found on the mesial side of the mandibular first premolar?

A

Mesial Lingual groove

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19
Q

Is there a distal marginal groove present on a mandibular first premolar?

A

No

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20
Q

From which view can one see more of the occlusal table on a mandibular first premolar (mesial or distal) and why?

A

Mesial because mesial marginal ridge is more cervical than distal marginal ridge

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21
Q

How does the distal marginal ridge compare to the mesial marginal ridge on a mandibular first premolar? (2 main factors)

A

Distal marginal on a mandibular first premolar is more occlusal and more horizontal (mesial marginal ridge is more vertical and cervical)

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22
Q

What outline does the mandibular first premolar have?

A

Diamond shape

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23
Q

Which is longer FL or MD on a mandibular first premolar ?

A

FL>MD on a mandibular first premolar

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24
Q

What shape is the occlusal table on a mandibular first premolar

A

Triangular in shape

25
Q

Do the Buccal and Lingual cusp on a mandibular first premolar offset in any way? if so, which way?

A

Buccal & Lingual cusp are offset mesially on a mandibular first premolar

26
Q

Form an occlusal view on a mandibular first premolar, how much space doe the buccal cusp take up?

A

2/3rds of an occlusal surface

27
Q

Does the mandibular first premolar have a pronounced transverse ridge?

A

Yes unlike maxillary first premolar

28
Q

Which fossa on a mandibular first premolar is larger?

A

Distal fossa on a mandibular first premolar is larger and more circular than mesial fossa, which is more linear.

29
Q

Which posterior tooth has the shortest F-L dimension?

A

Mandibular First Premolar

30
Q

Which premolar is the smallest?

A

Mandibular First Premolar

31
Q

Which posterior tooth is the only tooth to exhibit more cervical M-HOC than the D-HOC

A

Mandibular First Premolar

32
Q

Much of the occlusal surface of the Mandibular First Premolar is visible from the lingual view, a characteristic not seen in other posterior teeth

A

…

33
Q

What is the cross section of a Mandibular First Premolar at the cervical region?

A

Ovoid

wider buccally than lingually

34
Q

What tooth number are the Mandibular Second Premolar

A

20 & 27

35
Q

Which is larger, Mandibular First Premolar or Mandibular Second Premolar? (Crown & Root)

A

Mandibular Second Premolar

36
Q

Which is larger, Maxillary First Premolar or Maxillary Second Premolar?

A

Maxillary First Premolar

37
Q

Generally, how many cusps does a Mandibular Second Premolar have?

A

3 cusps and 5 developmental lobes

38
Q

From facial view, how is the cusp tip of a Mandibular Second Premolar centered?

A

cusp tip of a Mandibular Second Premolar is centered mesiodistally (where as mandibular first cusp tip is offset mesially).

39
Q

From the lingual view, where is the HOC on a Mandibular Second Premolar?

A

Lingual HOC on a Mandibular Second Premolar is from middle third to occlusal third

40
Q

what are the name of the three cusps on a Mandibular Second Premolar?

A

Mesiolingual, Distolingual, and Buccal cusp

41
Q

Which lingual cusp is larger on a Mandibular Second Premolar

A

Mesiolingual cusp is larger than distolingual cusp on a Mandibular Second Premolar

42
Q

What separates the Mesiolingual and Distoliwngual cusps on a Mandibular Second Premolar?

A

Lingual Groove

43
Q

Where is the buccal cusp tip of a Mandibular Second Premolar in relationship to the midline from the mesial view

A

Buccal cusp tip is facial to the tooth midline from proximal view

44
Q

How does the mesial and vital marginal ridge compare on a Mandibular Second Premolar

A

Distal marginal ridge is more cervical than mesial marginal ridge on a Mandibular Second Premolar

45
Q

How many cusps are visible from the mesial view of a Mandibular Second Premolar?

A

One can only see 2 cusps from mesial view of Mandibular Second Premolar

46
Q

How many cusps are visible from the distal view of a Mandibular Second Premolar?

A

All three cusps are seen on a Mandibular Second Premolar

47
Q

What are the 3 occlusal groove patterns on a Mandibular Second Premolar

A

Y-Type (3 cusp)
U-Type (2 cusp)
H-Type (2 cusp)

48
Q

Explain the Y-Shape Groove pattern on a Mandibular Second Premolar

A

Y-Shape is formed by lingual groove joining central groove
Works only for Mandibular Second Premolar with 3 cusp tips
No Transverse ridge

49
Q

What are the three pits and fossae named on a Y-Type occlusal groove pattern of a Mandibular Second Premolar

A

3 pits: Mesial, Central, Distal

3 fossae: 2 triangular (mesial and distal) and 1 central fossa

50
Q

What is the comparison of a Y-type to U & H shape groove pattern on a Mandibular Second Premolar

A

U or H shape groove pattern on a Mandibular Second Premolar apply for 2 cusp and are
More Rounded
Have more pronounced Transverse Ridge
DO not have lingual groove or central pit

51
Q

In a 2-cusp variety for a Mandibular Second Premolar, which way is the lingual cusp pointed?

A

On a 2-cusp variety of a Mandibular Second Premolar, the lingual cusp is offset mesial

52
Q

Is bifurcation possible for Mandibular Second Premolar?

A

Yes

53
Q

What si the root cross section of a Mandibular Second Premolar at the cervical third?

A

Root Cross section of a Mandibular Second Premolar is ovoid

54
Q

How doe the occlusal outline compare between Mandibular First and Second Premolar

A

Occlusal outline is more rounded in first and is more square in second

55
Q

Form proximal view, which mandibular premolar has the buccal cusp tip centered over midline?

A

Mandibular First Premolar buccal cusp tip is centered over root midline
Mandibular Second Premolar buccal cusp tip is facial to the midline.

56
Q

Does the Mandibular Second Premolar have a lingual crown taper?

A

Mandibular Second Premolar does not have a lingual crown taper
The MD dimension of the lingual half meets or exceeds the MD dimension of facial half

57
Q

The Mandibular Second Premolar is the only premolar that has a central Fossa

A

…

58
Q

Which posterior tooth may be congenitally missing?

A

Mandibular second

59
Q

Which anterior tooth may be congenitally missing?

A

Maxillary lateral incisor

Restorative dentistry (6 decks)

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