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74 Cards in this Set
- Front
- Back
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Which cusp ridge of the mand 1st is longer
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Distal
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Which cusp is longer on the mand 1st
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Facial
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From the lingual view of the mand 1st PM what surfaces besides the lingual can you see
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most of mesial, most of distal, large portion of occlusal
NOTE: on the mand 2nd PM from the lingual you only see the lingual in the Y form |
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cant delete
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cant delete
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The prominence of what facial feature makes the facial grooves more evident
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prominence of facial ridge
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In the occlusocervical direction where are the proximal contacts of mand 1st premolars more precisely located
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just cervical to junction of middle and occlusal third
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From facial to lingual the mesiodistal width of the mand first pre molar does what
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converges as you move lingually
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the lingual surface of the mand 1st premolar is best described as what two things
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narrow and convex
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the mand 1st PM has how many lobes that formed it
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4 lobes, 3 facial and 1 lingual
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The nonfunctioning cusp of the mand 1st PM is which one
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lingual -indicative of all mand post teeth
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Viewed proximally the mand 1st PM strikes it's antagonist in the upper arch where.
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in the central portion of the occlusal surface
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which crown surface combines with the occlussal surface to form the major part of the tooth
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large facial lobe
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The comparison of occlussal surfaces between max and mand 1st PM is what
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the max occlusal surface is much larger
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which proximal contact area is smaller on the mand 1st PM
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mesial contact
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the mand 1st PM differs from the max 1st PM in relation to the central grooves, HOW?
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the mand 1st PM usually doesnt have a full central groove due to the transverse ridge splitting it in half
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what feature bisects the mand 1st PM occlusal table into mesial and distal halves
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Prominent Transverse ridge(transvers ridge formed by 2 triangular ridges)
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what two features meet up to form the transverse ridge on a mand 1st PM
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lingual ridge of facial cusp and facial ridge of lingual cusp. (can also be called triangular facial ridge and triangular lingual ridge respectively)
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the transverse rigdge splits the occlusal surface of a mand 1st PM into 2 fossae what are they
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mesial and distal fossa
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what ridge of the mand 1st PM contributes most to the transverse ridge
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lingual ridge of facial cusp(facial triangular ridge)
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what direction does the mesial groove of the mand 1st PM run
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faciolingual
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what separates the mesial marginal ridge from the mesial ridge of the lingual cusp on the mand 1st PM
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mesiolingual groove - it originates from the mesial fossa and runs down onto lingual surface(Unique feature of mand 1st PM)
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between the mand canine and mand 1st PM which has a more round cusp tip
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mand 1st PM
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in which arch is the 1st PM cusp tip of the facial cusp located more distal from the long. axis of the tooth
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maxillary
NOTE mand 1st PM facial cusp located mostly centered mesiodistally |
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in the mandibular arch both the canine and 1st PM have what distal cusp ridge feature in common
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they are longer than their respective mesial cusp ridges
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in the max arch the relationship between lengths of distal and mesial cusp ridges of the canine and 1st PM are what
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the max canine has a longer distal cusp ridge while the max 1st PM has a longer mesial cusp ridge
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from a proximal view the facial cusp of the mand 1st PM is tilted which direction
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lingually
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Which marginal ridge more closely parallels the slope of the lingual cusp of the facial ridge on a mand 1st PM
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the mesial marginal ridge
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which cervical line is slightly more curved on the mand 1st PM, mesial or distal
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mesial(sticks with convention all other teeth we have seen)
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the proximal contacts of the mand 1st PM are located where faciolingually
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facially - lends to lingual embrasure having more depth/bigger
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mand 1st PM HOC's lie where
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middle 1/3 on lingual -1mm and cervical 1/3 on facial- < 1/2mm
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The mand 1st PM usually has how many roots
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1
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Sometimes a longitudinal groove can be found on proximal surfaces of mand 1st PM's, which one is it usually found on
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Mesial
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the mand 1st PM is usually described as what
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narrow and pointed
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which pulp horn is usually absent on mand 1st PMs
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lingual-due to cusp developement
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the root canal of a mand 1st PM is widest in what direction
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faciolingual - similar to canines
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root bifurcations are rare in the mand 1st PM, if found they are usually located where?
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apically
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mand 1st PM's usually erupt at what age
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10(10-12)
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half of the mand 1st PM is like a what tooth and the other is like what other tooth
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half like ant tooth and half like post
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the tooth shape of the mand 1st PM is described as what
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diamond, with a triangular occlusal table
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the angle of the mesial and distal marginal ridges of the 1st PM differ how
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the mesial tends to be at a 45 degree and the distal is horizontal
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best way to tell a mand 1st PM is how
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oclussaly you can notice narrow flat mesial surface
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the cusp tip of the mand 1st PM is centered how faciolingually and mesiodistally
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faciolingually - dead over center
mesiodistally- definitely centered Wilson's Words |
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some variations in mand 1st PM occur due to what
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lingual cusp being located mesially or distally
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in twins most all teeth are very close to identical except they can vary most in what tooth
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Mand 1st PM
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The 2nd mand PM is only PM to have what
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central fossa or central devolopmental pit
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the second mand PM usually erupts at what age
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11(10-12)
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what are the 3 forms of the mand 2nd PM
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Y shaped, H form and U shaped
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how many lobes does the 2nd mand PM Y form, form from
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5
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the largest of the two lingual cusps on a mand 2nd PM is
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the mesiolingual
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how many triangular ridges does the Y form of the mand 2 PM have
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3 triangular ridges thus 2 transverse ridges
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how many fossae does the occlusal surface of the mand 2nd PM Y form have
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3- mesial, distal and central
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What is the most common form of the mand 2nd PM
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Y shaped with 3 cusps
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Describe the lingual groove on the mand 2nd PM Y Form
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It comes from the central fossa and runs down the between the 2 lingual cusps
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What is the shape of the mand 2nd PM's Y form occlusal table said to be
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Square - due to faciolingual width being equal to mesiodistal width when looking at occlusal view
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what is the second most common form of the 2nd mand PM
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H form has only 2 cusps-facial and lingual
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Describe the 2 cusps on the H form mand 2 PM
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the 2 cusps are about equal length - facial might be slightly longer
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one way to tell mand 1st PM from 2nd is how
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look proximally at sloped occlusal table(mesial and distal marginal ridges)-the 1st is more slanted
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what surfaces can you see from the lingual view of mand 2nd PM
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just lingual side
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list the 3 cusps in order from biggest to smallest on the Y form of the 2nd PM
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Facial, meisolingual, distolingual
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on the Y shaped form of the mand 2nd PM which cusp is biggest
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Mesiolingual -use this feature to determine mesial side of tooth during identif.
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The mand 2nd PM has what root shape commonly
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bayonette
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On the mand 2nd PM which marginal ridge is more cervical - Mesial or Distal
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Distal Marginal Ridge is more cervical
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which crown is longer, mand 1st PM or 2nd PM
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mand 1st PM
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Which has the bigger root, mand 1st PM or 2nd PM
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2nd PM has a bigger root in all dimensions. both can curve slightly distal
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how many roots do mand PMs usually have
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1
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On the mand 2nd PM you have two variations in regards to pulp horn number
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2 cusp form(both H and U) has 2 pulp horns and 3 cusp form(Y) has 3 pulp horns
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the lingual surface of the mand 2nd PM in relation to the 1st PM is what
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wider meisodistally and taller occlusocervical
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due to the greater lingual development on the mand 2nd PM the distal and mesial marginal ridges appear to be arranged in what relationship to the long axis of the tooth
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Perpendicular
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In the mouth, the ________ is tipped slightly lingual to the long axis of the tooth while the ________ is tipped slightly facial to the long axis of the tooth
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Mand 2nd PM, Mand 1st PM
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on a mand 2nd PM, the central pit is located where in a faciolingual direction
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slightly lingual
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in a proximal view of the mand 2nd PM which marginal ridge is located more gingivially
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distal
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Where and how big are the HOC's on the mand 2nd PM
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Facial- cervical 1/3, 1/2 mmm
Ligual- Middle 1/3, 1 mm |
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How does the root of mand PM appear in a cross section
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oval shaped with widest portion being faciolingual measurement
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Where might you see a slight concavity on the root of a mand 2nd PM
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on the distal or mesial end under where the longitudinal groove is
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