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Dentistry Module 4 > Tooth Morphology > Flashcards

Tooth Morphology Flashcards

(84 cards)

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1
Q

What does height of contour (HOC) refer to?

A

The widest part of a tooth

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2
Q

Which tooth is usually the tallest in the oral cavity?

A

Mandibular canines

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3
Q

What shape are the maxillary central and lateral incisors described to have from a facial view?

A

Trapezoid shape

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4
Q

Which corner on a maxillary central incisor is sharper, usually at 90 degrees? Mesial or distal?

A

Mesial

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5
Q

Which corner on a maxillary central incisor is more rounded, Mesial or distal?

A

Distal

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6
Q

On a maxillary central incisor, which direction incisally is larger? Mesio-distal or bucco-lingual?

A

Mesio-distal

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7
Q

How many root canals does a maxillary central incisor have?

A

1

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8
Q

What maxillary tooth is the narrowest?

A

Permanent maxillary lateral incisor

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9
Q

Which maxillary incisor has a convex crown and root?

A

Maxillary lateral incisor

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10
Q

Which tooth is most likely to be malformed?

A

Maxillary lateral incisor

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11
Q

How many root canals does maxillary lateral incisor have?

A

1

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12
Q

Which permanent tooth is the first to erupt in the mouth?

A

Permanent mandibular central incisor

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13
Q

Which 4 teeth in the mouth only make occlusal contact with one opposing tooth, unlike the rest of teeth?

A

Upper third molars, and lower central incisors

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14
Q

Which tooth has the shortest root?

A

Mandibular central incisor

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15
Q

In a mandibular central incisor, where does the incisal edge fall relative to the long axis of the tooth?

A

Lingual

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16
Q

What is a key feature of the mesial and distal root surfaces of mandibular central incisors?

A

Developmental depressions

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17
Q

How many root canals does a mandibular central incisor have?

A

70 % 1 root canal
30% 2 root canals

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18
Q

What distinguishes the mandibular lateral incisor from the central incisor the most?

A

The mandibular lateral incisor’s distal marginal ridge peaks out from the medial view (distal twist)

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19
Q

How many root canals does the mandibular lateral incisor have?

A

55% have 1 root canal
45% have 2 root canals

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20
Q

Which incisor is the most likely to have two pulp canals?

A

Mandibular lateral incisor

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21
Q

What anterior teeth have the lowest value, appearing darker?

A

Canines

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22
Q

What is the canine eminence?

A

Prominence on the surface of the maxillary bone caused by the bulky canine root

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23
Q

The canine is the longest tooth in the oral cavity, at around 3cm. True or false?

A

True

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24
Q

Which anterior tooth has the largest cingulum on its lingual aspect?

A

Maxillary canine

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25
How many root canals does the maxillary canine have?
1
26
On what side of the mandibular canine is there a straight line from crown to root?
Mesial
27
which tooth in the oral cavity has the longest crown inciso-cervically?
Mandibular canine
28
What is meant by ‘shark arc’ on mandibular canines, when viewed from the medial aspect?
The facial aspect has a continuous, convex surface from crown to root
29
How many root canals does a mandibular canine have?
95% 1 root canal 5% 2 root canals
30
Which anterior tooth is most likely to have a bifurcated root (buccaly and lingually)?
Permanent mandibular canine
31
Which premolar is the largest?
The maxillary first premolar
32
How would you decipher if a premolar is maxillary or mandibular?
Maxillary premolars are more oval shaped, whereas mandibular premolars are more rounded
33
What is the defining feature of a maxillary first premolar?
It has a mesial marginal ridge groove
34
How many cusps do premolars have?
Two
35
How many pulp horns does a maxillary first premolar have?
Two
36
how many root/s does a permanent maxillary first premolar typically have, 85% of the time?
Two roots
37
Which tooth is notorious for root tip fracture during extractions?
Permanent first maxillary premolars
38
How does the buccal cusp of the second maxillary premolar differ from the first maxillary premolar?
The cusp is blunter
39
Permanent maxillary second premolars have a bifurcation. True or false?
False, no bifurcation only one root
40
How many root canals do permanent maxillary second premolars typically have, 75% of the time?
1 root canal
41
Which premolars are the smallest in the mouth?
Permanent mandibular first premolars
42
What is the permanent mandibular first premolars most prominent feature on its lingual aspect?
Mesio-lingual developmental groove
43
What is the permanent mandibular first premolars most prominent feature on its occlusal aspect?
Uniquely prominent transverse ridge
44
What is important to note about the lingual cusp of permanent mandibular first premolars?
It is very short
45
Which posterior teeth are the only ones that can occasionally have 1 pulp horn?
Permanent mandibular first premolars
46
How many root canals to permanent mandibular first premolars typically have, 75% of the time?
1 root canal
47
What is the defining cusp feature of permanent mandibular second premolars?
Lingual groove separating two lingual cusps
48
Which lingual cusp of permanent second mandibular molars is larger? Mesial or distal?
Mesial
49
Typically, how many root canals to permanent mandibular second premolars have?
1 root canal
50
Which tooth is widest bucco-lingually in the entire mouth?
The permanent maxillary first molar
51
What defining feature of the first permanent maxillary molar can be seen from the lingual aspect?
The cusp of carabelli
52
Which cusp on the permanent maxillary first molar is the cusp of carabelli attached to?
The mesio-lingual cusp
53
Which root on the permanent maxillary first molar is the longest and diverges the most?
The palatal root
54
What is the most important feature of the occlusal surface of permanent maxillary first molars?
Oblique ridge
55
what side of the permanent maxillary first molar is the oblique ridge closest to?
The distal side
56
How many pulp horns does a permanent maxillary first molar have?
4
57
How many root canals can a permanent maxillary first molar have?
70% 4 root canals 30% 3 root canals
58
What side of the permanent maxillary first molar crown do the root canals favour? (usually found)
The mesial side
59
which root, of the permanent maxillary first molar, usually has two root canals?
The buccal root
60
How do permanent maxillary second molars roots differ from permanent maxillary first molar’s?
They are less divergent and lean more distally
61
Which cusp is most likely to be missing in the ‘ heart-shaped’ variant of permanent maxillary second molars?
The disto-lingual cusp
62
How many root canals can permanent maxillary second molars have?
65% have 4 root canals 35% have 3 root canals
63
Which permanent teeth are the widest mesio-distally?
Permanent mandibular first molars
64
Which permanent tooth is most likely to become carious?
Permanent mandibular first molar
65
How many roots does a Permanent mandibular first premolar have?
Two roots (mesial and distal)
66
What is the main differences between the mesial and distal roots of the Permanent mandibular first molar?
The mesial root curves more and is biconcave (as it has two root canals), whereas the distal is straighter with a narrower root
67
How many cusps does a Permanent mandibular first molar have on its occlusal surface?
5
68
how many pulp horns do Permanent mandibular first molars have?
5
69
How many root canals do Permanent mandibular first molars have typically (65% of the time)?
3 root canals
70
How many root canals can Permanent mandibular first molars have?
65% have 3 roots 32% have 4 roots 3% have 2 roots
71
Which molar tooth has the longest roots?
Permanent mandibular first molar
72
How do Permanent mandibular second molar roots differ from Permanent mandibular first molars?
The roots are more parallel (almost convergent)
73
Which permanent teeth are the most likely to have a cervical enamel projection?
Permanent mandibular second molars
74
What are cervical enamel projections and what complications are associated with them?
Where the enamel dips down into the furcation area, this can male the tooth vulnerable to periodontal pocket in this area (risk of periodontitis)
75
what is the defining feature of Permanent mandibular second molar’s crown?
Mesio-buccal cervical bulge
76
How many cusps do Permanent mandibular second molars have?
4
77
How many pul horns do Permanent mandibular second molars have?
4
78
How many root canals do Permanent mandibular second molars have 55% of the time?
3 root canals
79
How many root canals do Permanent mandibular second molars have 45% of the time?
4 root canals
80
What percentage of people are missing at least one permanent third molar?
35%
81
What percentage of people have at least one impacted permanent third molar?
90%
82
Which permanent teeth have the shortest crown?
Maxillary third molars
83
Which posterior permanent teeth have the shortest roots?
Mandibualr third molars
84
Which permanent teeth have the most variable morphology, often with root convergence?
Mandibular third molars

Dentistry Module 4 (20 decks)

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