Molars Flashcards
(106 cards)
1
Q
What are the molar Numbers?
A
1,2,3 and 14,15,16 and 17,18,19 and 30,31,32
2
Q
the only teeth with no tooth in proximal contact with the distal surface
A
3rd Molars
3
Q
What are quadrant width of max and mandibular molars?
A
Max= 44% of quadrant
Mand= 51% of quadrant
4
Q
What are the 4 functions of molars?
A
- Mastication
- Maintain vertical dimension of face
- Maintain continuity within dental arch
- Keeps cheeks full
5
Q
What happens to the face if molars are missing?
A
Suken face look+ anteiror teeth flare out
6
Q
What can result as the loss of a mandibular 1st molar?
A
- Hole
- Super eruption of the oposing maxillary 1st molar
7
Q
What can result as the loss of a maxillary 1st molar?
A
- Hole
- Tipping and imigration of posteior teeth to feel the space
8
Q
Largest tooth in the mouth, 80mm2 of chewing surface
A
1st molars
9
Q
the relationship between the maxillary and mandibular teeth when they approach each other.
Teeth to teeth relationship
A
Occlusion
10
Q
Explain crown size trend on molars?
A
- Larger MD than BL
11
Q
Explain the trend of buccal to lingual size trend of molars, what is the exception?
A
All molars taper from buccal to lingual in size, EXCEPT maxillary 1st molar with large DL cusp.
12
Q
Explain the trend of mesial to distal sze trend of molars
A
Taper smaller mesial to distal from an occlusal view
13
Q
Explain the trend of mesial to distal height of molars
Buccal View
A
Taper shorter from mesial to distal.
Mesial cusp taller.
Buccal View
14
Q
Explain the height of contour for most molars?
A
Buccal crest of contour is at cervical 3rd, lingual crest of contour is in the middle 3rd.
15
Q
Explain contact locations on molars?
A
- Mesial contact= occlusal 3rd
- Distal contact=middle 3rd
16
Q
What is the crown outline of maxillary molars?
A
Wider FL, Square/rhomboid shape
17
Q
What is the crown outline of mandibular molars?
A
Wider MD, rectangle
18
Q
What molars have an oblique ridge from the ML to the DB cusp?
A
Maxillary Molars
19
Q
What molars have cross like shape central groove?
A
Mandibular Molars
20
Q
How many cusps do maxillary molars have?
A
3-5 Cusps
* DL cusps can be missing sometimes on 2nd maxillary molars.
* Cusp of carabellie can be present on ML of 1st maxillary molar.
21
Q
How many cusps do mandibular molars have?
A
4-5 Cusps
* 1st molars can have a 5th DB cusp
* 2nd molars always have 4 cusps
22
Q
Explain crown tilt in molars?
A
Max molars= no tilt
Mand molar= lingual tilt
23
Q
Number of roots on molars
A
Max= 3 roots; 1 paletal, 2 buccal
Mand= 2 roots
24
Q
Explain roots on maxillary molars
A
3 roots
1. Longest paletal root
2. DB root; shortest
3. MB; wider + longer
25
Explain mandibular roots
2 roots
1. Mesial root (longer, wider)
2. Distal root (shorter, narrower)
26
# Mandibular Molars
Name the buccal cusps of **Mandibular 1st molars** and rank them from greatest to smallest
Largest to Smallest
1. MB
2. ML
3. DL
4. DB
5. D
27
Name the buccal cusps of **Mandibular 1st molars** and rank them from tallest to shortest
Tallest to shortest
1. ML
2. DL
3. MB
4. DB
5. D
28
How many buccal grooves does the mandibular first molar have? Name?
1. Mesio buccal groove
2. Disto buccal groove
29
How many buccal grooves does the mandibular second molar have? Name?
Buccal groove
30
Only 15-20% of mandibular 1st molars are what?
the 4 cusp type. No distal cusp
31
How many cusp on mandibular 2nd molars, name, rank in size.
4 cusps ; MB, DB, ML, DL
Tallest cusp= ML
Biggest cusp= MB
32
Name the buccal cusps of **Mandibular 2nd molars** and rank them from tallest to shortest
Tallest to shortest
1. ML
2. DL
3. MB
4. DB
33
Name the buccal cusps of **Mandibular 2nd molars** and rank them from largest to smallest
Largest to Smallest
1. MB
2. DB
3. ML
4. DL
34
Explain proximal cotact of mandibular molars
Mesia= more occlusal
Distal= More middle 3rd
35
Explain CEJ on molars
Cut straight across and somtimes dips into frucation area
36
The mesial contour on mandibular is what?
Straighter
37
Compare roots on mandibular molars
1st= wider roots, more bent at apex (distal shorter)
2nd= closer roots, straighter
38
On mandibular molars, the ____ cusp is wider than the ____ cusp
ML wider than DL.
| Can oven be viewd from buccal side cause theyre taller.
39
40
What is the purpose of the lingual till of mandibular molars
Prevents cheeks biting
41
Expalin crest of contour on mandibular molars
Lingual= middle 3rd
Buccal= Cervical 3rd
42
# Mandibular molars
ridge forms a buccal bulge running mesiodistally and is often more prominent in mesial half
Cervical Ridge
43
WHat cusps side are more pointed on mandibular molars?
Lingual cusps more pointed & longer than buccal cusps.
44
When looking at a mandibular molar froma proximal view, which side is higher?
Mesial higher, tapes down distally.
45
Compare the marginal ridges on mandibilar molars
* MMR is more occlusal
* DMR is more cervical
46
Explain the roots of mandibular molars
Mesial root is broader FL and longer than the distal root. You cant see anything past mesial root.
47
Explain the canals in mandibular molar roots
Mesial Root has 2 canals
Distal root has 1 canal
48
# Mandibular
How many cusps do 1st molars have?
5 cusps; MB biggest, Distal smallest
49
# Mandibular
How many cusps do 2nd molars have?
4 cusps; MB largest, DL the smallest
50
On what molars are buccal pits and decay common?
Mandibular molars
51
# occlusal view
**Buccal cervical ridge **more prominent on mesiobuccal outline on what mandibular molars?
Mandibular 2nd molars =
52
# occulsal view
**Buccal cervical ridge** more prominent near the middle (over **distobuccal** cusp), making outline more **pentagon** shaped what mandibular molar?
Mandibular 1st molars
53
How many transverse ridges do mandibular molars have, what is the extra?
Both mandibular molars have 2 transverse ridge (MB-ML) and (DB-DL) and 1st molars have seperate triangular ridge on Distal cusp.
54
How many fossa do mandibular molars have?
3 fossa; 3 pits. Central is largest.
55
What mandibular molar has more zig zag central groove.
Mandibular 1st
56
On both mandibular molars the mesial and distal contacts are slighlty more ____ so the ____ embasure is larger.
Contact more buccal, lingual embasure larger.
57
What is the largest maxillary tooth?
Mandibular 1st Molar
57
58
What are the names of the two buccal cusps of a maxillary molar?
DB and MB
59
Which cusp tip may also be visible from the buccal view on max molars?
ML cusp, b/c it is much taller and does a lot of work
60
____ groove separates the mesiobuccal and distobuccal cusps, but is not caries prone on what molars?
Buccal groove on Max Molars
61
What cusps form the oblique ridge on max molars?
ML to DB
62
Where are proximal contact on max molars?
Mesial contact= middle 3rd
Distal contact= cervical 3rd
63
Which one is the longest maxillary molar root? Which is the shortest?
Longest= Paletal
Shortest= Distal-buccal
64
How does the root trunk on the Max first molar compared to that of a Max second molar? How about root divergence?
Max 1st= short root trunk
Max 2nd= thicker
65
Explain root trends on max molars
Max 1st= wider roots
Max 2nd= closer roots
66
On Max molars the occlusal cervical dimension is what compared to FL?
Shorter. Max crowns are wide and short
67
How many cusp can you see from mesial view of a max molar?
Only two cusps (plus Carabelli, if present) visible from mesial view** since distal cusps are shorter**
68
How many cusp can you see from distal view of a max molar?
4 cusps, since distal cusps are much shorter, you may be able to see some of the facial and lingual surfaces as well.
69
Explain marginal ridges on max molars
MMR is more occlusal, DMR is more cerivical, see more past.
70
Tubercles are More Common on ____ Marginal Ridges than __
More common on MMR
71
How many roots can you see on a max molar from a mesial view?
Only 2 (MB & Lingual) , becauase MB root is wider and taller covering the DB root.
You can see all 3 roots from distal
72
Max 2nd molars have 3 larger cusps (mesiobuccal, distobuccal, and mesiolingual) and one smaller or absent cusp ?
The DL cusp
73
Max 1st molars have 4 cusp plus a ____ on the ____ cusp
Cusp of Carabellie on large ML cusp
74
Max First and second have ____ greater than ____ dimension
BL narrower than MD dimesion
75
Explain Occlsual shape of Max 1st molars and why
Buccal half of crown is narrower than lingual half due to the large DL cusp.
Rhomboid almost square.
| occlusal view
76
# What molar
More rectangular outline
Mandibular 2nd molar
77
What is the transverse ridge on max molars?
MB to ML cusp
78
79
Occlusal preperations of maxillary molars may not what?
NOT pass the oblique ridge
80
Explain proximal contacts on maxillary molars
They are both slightly buccal to the midline, so the lingual embasure is larger.
81
Explain main traits of all 3rd molars
* Smaller
* Bulbous+ smaller occlusal table
* Wrinkled surface
* Fused roots, open apices
* Roots bend distally
82
only maxillary teeth to occlude with only one tooth
Maxillary 3rd molars
| Mandibular centrals also.
83
3rd molars when they havent fully errupted may be covered witha tissue flap called
Opperculum
84
Trauma and infection to the opperculum may cause
Pericoronitis
85
What are the shortest permanent teeth? Short crowns and roots
3rd molars
86
# What varitation on what tooth?
Extra cusp on buccal surface of cusp
mandibular molars
87
Possible extra lingual cusp on mandibular molars
Tuberculum intermedium
88
Extra cusp (tubercle) on distal marginal ridge of mandibular first molar is called
tuberculum sextum
89
Which three grooves radiate out from the central fossa in a maxillary first molar?
* Central
* Transverse groove of oblique ridges
* Buccal
90
Which cusp on a maxillary first molar has two ridges: one that forms part of a transverse ridge and the other that forms part of an oblique ridge?
Mesiolingual
91
Which cusp is the largest and longest on a maxillary second molar?
Mesiolingual
92
Which cusp is most likely to be absent on a maxillary second molar?
Distolingual
93
Of the four fossae on a maxillary first molar, which is the largest?
Central
94
From which view are only two roots visible on a maxillary first molar?
Mesial
95
Which two cusps have the ridges that make up or join to form the oblique ridge on a maxillary molar?
ML and DB
96
Which two cusps have a triangular ridge that make up or join to form a transverse (not oblique) ridge on most maxillary molars?
MB and ML
97
List cups of max 1st molar from largest to smallest
Largest to smallest
1. ML
2. MB
3. DB
4. DL
5. CC (if present)
98
Which of the following grooves radiate out from the central fossa in a mandibular second molar?
Central, Lingual, Buccal
99
Which cusp is the largest and longest on a mandibular second molar?
ML
100
Which cusp may be absent on a mandibular first molar?
Distal
101
When the distal cusp is present which groove(s) would not be present?
Mesiobuccal and distobucclal; it would just be a buccal groove
102
From which view is only one root visible on a mandibular first molar?
Mesial
103
Which root may occasionally be divided or bifurcated on a mandibular first molar?
Meisal root
104
On a five-cusped molar, which cusp does not have a triangular ridge that forms part of a transverse ridge?
Distal
105
Which two pairs of cusp triangular ridges make up or join to form the two transverse ridges on a **mandibular second molar?**
DB-DL and MB-ML
