final Premolars

Question 1

most premolars have how many cusps? exception?

Answer 1

have 2 cusps; buccal and lingual

*Ex: 2nd man CAN have 3; buccal, mesiolingual and distolingual

Question 2

mesial distal marginal rdiges are normally _____ for premolars? exception?

Answer 2

normally horizontal

*Ex: mand 1st premolar has a 45 degree MESIAL marginal ridge

Question 3

mesial contacts are typically _____ and distal are typically ______? exception?

Answer 3

mesial are typically are the junction (more occlusal) and distal typically more cervical in the middle 3rd
*Ex: mandibular 1st premolar mesial contact is more cervical due to 45% angle of mesial marginal ridge

Question 4

both mesial and distal contacts are more lingual or buccal?

Answer 4

buccal

Question 5

facial shape of premolars?

Answer 5

pentagonal

Question 6

occlusal outline of maxillary premolars?

Answer 6

trapezois

Question 7

occlusal outline of mandibular premolars?

Answer 7

rhombus

Question 8

the buccal cusp tip is ____ to the mid-line root axis? exception?

Answer 8

mesial

*Ex: max 1st premolar buccal cusp is distal to midroot axis

Question 9

mesial cusp ridge of buccal cusp is____ the distal cusp ridge? exception?

Answer 9

mesial cusp ridge of buccal cusp is SHORTER than the distal cusp ridge
*Ex: maxillary 1st premolar mesial ridge is longer

Question 10

mesial marginal ridges are more ____ than their distal marginal ridges? exception?

Answer 10

mesial marginal ridge more OCCLUSAL than distal

*Ex: mandibular 1st premolar mesial marginal ridge is cervical

Question 11

premolars are wider ___ then ____

Answer 11

wider facialingually than mesiodistally

Question 12

the apical 3rd portion of roots bend?

Answer 12

distally

Question 13

all premolars taper towards the lingual or facial? exception?

Answer 13

LINGUAL

*Ex: 3 cusp mandibular 2nd premolar (bc they have two lingual cusps making it larger)

Question 14

mandibular lingual cusps are shorter or longer than maxillary lingual cusp?

Answer 14

shorter

Question 15

maxillary lingual cusps are distal or lingual to root axis?

Answer 15

mesial

Question 16

both maxillary premolars have what root depressions?

Answer 16

mesial AND distal

Question 17

what tooth has the mesial root depression spreading up through the crown?

Answer 17

maxillary 1st premolar due to bifurcated root

Question 18

** what is the only tooth that has a buccal cusp tip distal to the root and the mesial cusp ridge is taller?

Answer 18

maxillary 1st premolar

Question 19

angles of buccal cusps for maxillary and mandibular?

Answer 19

max 1= 105

max 2= 120-125

Question 20

mesial marginal ridge grooves are almost always present on?

Answer 20

maxillary 1st premolars

Question 21

buccal ridges are more prominent on maxillary 1st or 2nd premolars?

Answer 21

max 1st premolar

Question 22

buccal cusp tip is mesial or distal to the root on 2nd max premolar?

Answer 22

mesial

Max 1st is distal

Question 23

angles of buccal cusps for mandibular 1st and 2nd premolar?

Answer 23

mand 1= 110

mand 2= 130

Question 24

what is unique about the mandibular 1st premolar lingual cusp?

Answer 24

WAY SMALL and nonfunctional (think about 45 degree angle again)

Question 25

**mesial lingual groove on the mandibular 1st premolar separates?

Answer 25

the mesial marginal ridges and lingual cusp

Question 26

the second mandibular 3 cusp premolars have a _____ groove separating the two lingual cusps

Answer 26

lingual groove

Question 27

what premolar is LEAST LIKELY to have root depressions (mesial)?

Answer 27

mandibular 2nd premolar

Question 28

what tooth has a “mesiolingual corner”?

Answer 28

2nd mandibular premolars