Quiz 3. Posterior and Primary Dentition Flashcards
What teeth are present in the Posterior Dentition
2 Premolars
2 Molars
8 on each arch
16 Total
When talking about occlusal we’re referring to?
Only talking about molar/premolar
Where are the marginal ridges on the posterior teeth?
Distal and mesial
What is a cusp tip?
Pointy part sticking up (all of them have)
What’s the inclined plane
From cusp -> middle
Central groove
Where most cavities occur
Marginal groove
Goes over marginal edge
Height of contour
Lingual Higher
Buccal lower
Premolar (Bicuspids)
Chew and grind a lot on them, not built for that
Mostly crowns are on premolars
Replace molars in primary dentition
What kind of concavities do premolars have?
Proximal root concavities
Where are the mesial and distal contacts of premolars?
cervical to junction of occlusal and middle thirds
What do the premolars consist of?
Occlusal table w/ marginal ridges, cusp, cusp tips, ridges, inclined planes, grooves, fossae, pits
What kind of ridge does a premolar have?
Buccal ridge
Buccal Features of 1st premolar
More likely to have 2 roots than 2nd
Buccal developmental depression
Not everyone has
Max R 1st premolar #5
Proximal root concavities
Larger crown than 2nd molar
Developmental groove: where cavities form
5 Max (1st premolar) cusp details
2 cusps, bicuspid
Buccal cusp > Lingual
Mesial cusp Longer than distal
5 Max (1st premolar) root details
2 roots(bifurication)
Long trunk
2 pulp chambers
What is special about the mesial marginal groove on tooth #5?
Goes all the way down side into mesial surface (disappears over the side)
4 Max 2nd premolar Characteristics
Single root
Buccal cusp>Lingual (slightly)
Smaller crown than 1st
Mesial groove stops nowhere close to edge (Not on mesial)
4 Max (2nd premolar) Additional
Occlusal: Mesial/distal pit, central groove
Cingulum on anterior
Cusps on posterior
28 Mand 1st premolar
Single root
Lingual cusp
What tooth does #28 resemble?
It looks more like a canine than a molar
Where does #28 mesiolingual groove happen?
Comes onto lingual
Additional info of #28
Extract if need room for braces
If need fillings, termed “snake eyes”
29 Mand. R 2nd premolar
Single rooted
Shaped like a small molar
Larger crown than 1st
29 Cusps
Cusps similar in size
Usually have 3 cusps, although some people only have 2, varies from person to person
2= U or H shape (occlusal)
3= Y shape (occlusal)
29 2nd premolar Additonal
Mesial/distal pit, central groove
3 Max 1st molar
Trifurication- 4 root canals
Divergent roots
Largest tooth in max arch/crown in dentition
3 First Molar Cusps
4 major cusps: 2 buccal 2 lingual
Cusp of Carabelli: Mesiolingual cusp (3 lingual, 2 Buccal) *Some people have and some don’t
3 First Molar additional features
Distolingual cusp is smaller
Permanent Molars Root for Maxillary
Maxillary: 3 roots, 2 are always buccal (mesio/disto buccal root) 1 lingual/palatal root
Permanent Molars for Mandibular Root
Only have 2 roots: mesio and distal root
Permanent Molars 4 main cusps
Lingual groove: where cavities form
Oblique ridge: big ridge of enamel, don’t cut through. Do fillings all around tooth to leave alone (distobuccal->mesiolingual cusp)
3 Mesial Drift:
Teeth drift toward front of mouth
Lean/tilt with missing molar
Better to lose top than bottom, top tend to continue to grow if bottom isn’t present
2 Mand. 2nd Molar
Smaller crown than 1st molar 3 or 4 Cusps Oblique ridge Lingual> Buccal Some have no distolingual cusp
17 Max 3rd molar
Trifurication- but they’re fused (large variation)
Curve distally
Easy to extract, quick, bone is thin
Smaller crown than second
17 Max 3rd molar additional fact
Some get an extra 3rd molar way in the back even after wisdom teeth
30 Mand 1st molar
1st permanent to erupt
Widest crown front to back (mesiodistally)
Buccolingual
Side to side
30 Mand. 1st molar cusps
5 cusps (Y-groove) 3 Buccal (slightly shorter) 2 Lingual
30 Mand. 1st molar root
Bifurcated roots, 3 different canals
2 Mesial
1 Distal
30 Mand 1st molar, Mesial drift
Teeth tilted on side, perio issues. Tooth grows into empty space
31 Mand 2nd molar
Generally 2 roots(less divergent), Fused together on some
Small mesiodistally than 1st molar
4 cusps
Smaller than first crown
32 Mand. 3rd molar
Roots (irregularly) tilted toward distal, Fused
Impacted Commonly
Smaller crown than 2nd
Dilaceration
Crooked or bent roots
Mulberry Molars
Happens to molars, look like berries
Caused by syphilis
Enamel Pearls
Extra enamel developed, show up on x-rays
Developmental thing
In Furications
Fusion or Concrescence
2 tooth buds fused/hooked together
Cementum overgrew and fused teeth together, look fine on outside
Detigerous Cyst
Can destroy bone, weakens it
Would have to go in and remove
Primary Posterior
8 Posterior
Nice Diastimas in children teeth is a good thing.
Braces are going to be needed if there is crowding
Primary vs Posterior
No pre-molars
Detect decay early in primary dentition. Bigger pulp and thinner enamel
What is the only primary tooth that is wider than it is tall?
Primary Maxillary Central Incisor
Which molar is closest in anatomy from primary to permanent?
2nd molars
