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Premolars Flashcards

(53 cards)

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1
Q

what are the # of maxillary premolars

A

5, 4, 12, 13

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2
Q

general characteristics of maxillary premolars

A
  • have occlusal surface
  • two cups: lingual and buccal
  • do not refer them as bicuspid
  • succedaneous teeth
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3
Q

how many lobes for maxillary premolars

A
  • 4 lobes
  • 3 buccal lobes: MB, B, and DB form the buccal cusp
  • 1 lingual lobe forms the lingual cusp
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4
Q

what is the central developmental groove

A

-demarcation between the buccal and lingual lobes

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5
Q

maxillary first premolar buccal view

A
  • resembles a canine
  • roughly trapezoidal
  • mesial cusp arm longer and straighter
  • distal cusp arm shorter and more curved
  • buccal height of contour in cervical third
  • mesial concavity below mesial contact
  • prominent buccal ridge
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6
Q

maxillary first premolar contacts

A
  • mesial and distal: in middle third
  • mesial contact is offset buccally
  • distal is generally pretty convex and offset buccally
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7
Q

maxillary first premolar lingual view

A
  • crown tapers lingually
  • more narrower than buccal
  • smoothly convex
  • lingual cusp 1mm shorter and pointed. Can see buccal cusp from lingual view
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8
Q

maxillary first premolar interesting fact

A
  • mesiolingual cusp arm (ML) is shorter than the distolingual cusp arm
  • OPPOSITE of the buccal cusp
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9
Q

maxillary first premolar mesial view

A
  • shape: trapezoidal
  • 2 cusps visible: buccal and lingual
  • buccal cusp is taller
  • buccal height of contour: cervical
  • lingual height of contour: middle third
  • have mesial developmental depression/concavity
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10
Q

maxillary first premolar roots

A
  • 50-60% have 2 roots
  • long root trunk (about 1/2 to 2/3 lenght of the root)
  • has furcation
  • buccal: resembles the root of the canine just shorter
  • broad BL, narrow MD
  • have mesial developmental depression
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11
Q

maxillary first premolar distal view

A
  • doesnt have the mesial concavity, mesial developmental depression or see marginal ridge developmental groove
  • CEJ curve less than mesial
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12
Q

maxillary first premolar occlusal view

A
  • hexagonal outline
  • BL dimension greater than MD
  • Crown wider buccal than lingual
  • each cusp is composed of 4 ridges
  • mesiobuccal cusp ridge is longer than distobuccal
  • mesiolingual cusp ridge is shorter than distolingual
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13
Q

maxillary first premolar pulp

A
  • overall cross section looks kidney shaped, two pulps or one
  • if two, the buccal is larger
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14
Q

maxillary second premolar #

A

4, 13

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15
Q

maxillary second premolar general characteristics

A
  • resembles the 1st premolar but it is smaller
  • more rounded
  • single root
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16
Q

maxillary second premolar buccal view

A
  • similar to premolar
  • MB and DB line angles less prominent
  • buccal cusp ridge not as obvious/long
  • mesiobuccal cusp is shorter
  • developmental depressions not as developed
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17
Q

maxillary second premolar lingual view

A

-lingual cusp longer than 1st premolar so less visability of the buccal profile of the tooth from the lingual aspect

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18
Q

maxillary second premolar mesial view

A
  • buccal and lingual cusp about equal in size but shorter compared to 1st premolar
  • No mesial marginal ridge developmental groove
  • No mesial developmental depression
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19
Q

maxillary second premolar roots

A
  • single root
  • broad BL, narrow MD
  • no developmental depressions
  • 2 pulp horns
  • 50% have 2 canals
  • transverse: oval shaped root and pulp
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20
Q

maxillary second premolar distal view

A
  • similar to mesial

- buccal and lingual cusp about equal in size but shorter compared to 1st premolar

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21
Q

maxillary second premolar contacts

A

-distal and mesial contact in middle third and offset to the buccal

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22
Q

maxillary second premolar occlusal view

Study These Flashcards
A
  • rounded or oval
  • MB and DB line angles are more rounded
  • central developmental groove is shorter so mesial and distal marginal ridges are wider
23
Q

maxillary second premolar heights of contour- mesial

24
Q

maxillary second premolar heights of contour- distal

25
maxillary second premolar heights of contour- buccal
cervical third
26
maxillary second premolar heights of contour- lingual
middle third
27
mandible first premolar #
21, 28
28
mandible premolar general characteristics
- 20, 21, 28, 29 - succedaneous teeth - first molars come from 4 lobes - second molars come from 5 lobes
29
mandible first premolar buccal view
- shape: trapezoidal - prominent buccal ridge (well developed middle buccal lobe) - buccal cusp resembles the mandibular canine but with a more rounded tip - mesial slope of the buccal cusp is short than distal slope (opposite of the maxillary 1st premolar) - M and D heights of contour in middle third - surface is convex
30
mandible first premolar root
- shorter than the canine - curves distally - grooved longitudinally on the M and D surfaces - rare but could be bifurcated
31
mandible first premolar lingual view
- crown and root taper lingually - lingual cusp is small, might resemble a canine - occlusal surface slopes lingually - smoothly convex in all directions - M and D concave from cervical margin to contact areas - mesiolingual developmental groove
32
Mesiolingual developmental groove of mandible first premolar
- demarcates the lingual lobe from the mesiobuccal lobe | - separates mesial marginal ridge from lingual cusp
33
mandible first premolar root
- pointed apex - developmental depressions or grooves mesially on the root - distal is less grooved has no deep groove
34
mandible first premolar mesial view
- outline: rhomboidal - very curved/convex - cusp tip is centered over midline of root - buccal height of contour at junction of middle and cervical thirds - lingual height of contour in middle third (overhangs root trunk) - 1/3 difference of height between lingual and buccal cusp tips from CEJ
35
mesial marginal ridge on mandible first premolar
slopes cervically, can see on the lingual side. Gives it like a right angle on the mesial and distal views.
36
what is something distinct about mandible first premolar
-only tooth in which the mesial marginal ridge is at a lower level than the distal marginal ridge
37
mandible first premolar distal view
-smoothly convex -distal height of contour is in middle third -
38
mandible first premolar contacts
- distal: in middle third - distal contact are broader than mesial - contacts are centered buccolingually
39
mandible first premolar occlusal view
- diamond in outline - buccal cusp and buccal ridge are pronounced - lingual cusp is small and resembles cingulum of canine - crown is wider buccally than lingually - MB and DB line angles prominent and rounded - cusps maybe seperated by a central groove as in the maxillary premolars
40
mesiobuccal and distobuccal cusp ridge
mesiobuccal cusp ridge is shorter than distobuccal cusp ridge
41
transverse ridge in mandible first premolar
- the single ridge formed by the buccal and lingual triangular ridges joined together - separates the mesial occlusal fossa from the distal occlusal fossa
42
mandibular second premolars #s
20 and 29
43
mandibular second premolars occlusal view
can have two different occlusal surfaces
44
interesting facts about mandibular second premolars
- 2 types of mandibular 2nd molar | - 3 cusp type with 5 lobes OR 2 cusp type with 4 lobes
45
mandibular second premolars buccal view
-resembles the mandibular first premolar -BUT the buccal cusp is shorter and less pointed -
46
mandibular second premolars contact areas
- M and D contacts are broad - appear higher due to the small buccal cusp - in the middle third
47
mandibular second premolars root
- compared to the mandibular first premolar it is broader MD | - apex is more blunt
48
mandibular second premolars lingual view
- differs from mandibular first premolar: - lingual lobes are better developed - less of the occlusal surface is visible
49
lingual groove of mandibular second premolars
- separates the two lingual cusps | - the mesiolingual and distolingual cusps
50
mandibular second premolars mesial view
- differs from mandibular first premolar: - crown and root are wider BL - buccal cusp tip not as lingually placed - buccal cusp is shorter - lingual and buccal cusps more equal in size - NO mesiolingual development groove is present - mesial marginal ridge is at right angles
51
mandibular second premolars distal view
-similar to mesial but has more occlusal surface is visible
52
mandibular second premolars occlusal view with 3 cusp
- square in shape - 2 lingual cusps and one buccal - Y shaped *** (mesial, distal, lingual developmental grooves) - have a central pit - mesial triangular fossa and distal triangular fossa
53
mandibular second premolars occlusal view with 2 cusp
- outline is rounded - H or U shaped developmental grooves**** - H is more commonly seen - may or may not have mesial and distal pits

Morphology (5 decks)

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