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Dental Anatomy 811 > Lecture 4- Permanent incisors > Flashcards

Lecture 4- Permanent incisors Flashcards

1
Q

First permanent tooth to errupt

A

mandibular 1st molar

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2
Q

Last PRIMARY tooth to be lost (at age 12, marking the end of the mixed dentition period)

A

primary 2nd molar

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3
Q

What is special about the maxillary central incisors? (5)

A

1) Esthetically the most prominent teeth
2) Most prone to trauma
3) widest anterior tooth
4) Curvature of the cervical line on mesial aspect of central incisor is greater than that of any other tooth, on any aspect
5) Only maxillary central and mandibular 2nd PM have straight conical roots

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4
Q

Maxillary anterior alignment

A

Inclined mesially form lateral view

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5
Q

labial and lingual geometric shape

A

Trapezoid

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6
Q

Proximal geometric shape

A

Triangle

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7
Q

Incisal geometric shape

A

Triangle/circle

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8
Q

Why is is a trapezoid?

A

Because central incisor is longer cervico incisally than it is wider mesiodistally

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9
Q

Distolabial line is more convex on central incisor than the mesiolabial line. This leads to

A

Point angles:
Mesio-incisal sharp approaching 90 degrees
Disto-incisal angle more convex
(pattern that is repeated in most teeth)

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10
Q

Mesial contact area

A

located at incisal third

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11
Q

Incisal embrasure size trend

A

INCREASE as you move POSTERIORLY

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12
Q

lingual embrasure is larger than labial embrasure

A

1) All teeth have lingual convergence

2) Proximal contact is facial to the center

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13
Q

Lingual pit

A

Sometimes found in lingual fossa

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14
Q

Cervical line on central incisor/proximal aspects

A

Curvature of the cervical line on mesial aspect of central incisor is greater than that of any other tooth, on any aspect

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15
Q

Incisal aspect of incisors

A

Mesiodistal dimension is slightly Greater than labiolingual dimension (bolded)

Cingulum off center to distal side

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16
Q

Incisal aspect of incisors

A

Lingual embrasure is larger than facial embrasure in ALL teeth

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17
Q

Incisal root

A

STRAIGHT CONICAL ROOT (incisors and 2nd maxillary premolar)

18
Q

How many canals do incisors have? (pulp space morphology)

A

one

19
Q

Occlusion of maxillary central incisor

A

Occludes with mandibular central AND lateral incisors

20
Q

Maxillary lateral incisor

A

The last permanent incisor to erupt

21
Q

Peg shaped lateral

A

lateral incisor that is significantly smaller than it should be

22
Q

congenitally missing lateral incisor

A

3rd most common congenitally missing tooth

options for treatment: implants or removable prosthesis

23
Q

Maxillary lateral incisor vs maxillary central incisor

A

lateral- more rounded outlines, more convex (more rounded incisal edge and incisal angles/mesial and distal)

smaller in all dimensions EXCEPT root length

24
Q

Proximal contact area

A

Mesial: Junction of incisal and middle thirds
Distal: middle third

25
Q

Embrasure area

A

Distoincisal embrasure is larger than mesioincisal embrasure (bolded)

26
Q

Lingual aspect of lateral incisors

A

The marginal ridges, cingulum, and incisal ridge are more pronounced (bold) so more accentuated lingual fossa

27
Q

lingual aspect of lateral incisors

A

lingual pit and lingual developmental groove are more likely

28
Q

Proximal aspect of lateral incisors

A

Incisal ridge is in line with center of the root

29
Q

Incisal aspect of lateral incisors

A

Looks like a triangle or OVAL outline (due to prominent cingulum)

Incisal ridge is thicker labiolingually compared to the central incisor

30
Q

Pulp space morphology/number of canals of lateral incisors

A

one

31
Q

root of lateral incisors

A

single root; distal curvature

32
Q

Occlusion of lateral incisors

A

mandibular lateral incisor and canine

33
Q

third most common tooth to be congenitally missing

A

maxillary lateral incisor

34
Q

What is special about the Permanent Mandibular Central Incisor?

A

It is the smallest tooth

It is the most symmetrical tooth

35
Q

labial surface of mandibular incisors is

A

bilaterally symmetrical (mesial half is identical to distal half)

36
Q

Proximal contacts and embrasures of mandibular central incisors

A

Both mesial and distal contact areas are at the same level at the incisal third (bolded) of crown near the mesial and distal incisal angles

Both incisal embrasures are the same size and very small

37
Q

lingual aspect of mandibular central incisors

A 
The marginal ridges are ill defined
 lingual fossa small and shallow
Shallow smooth cingulum
No lingual pit  
(bolded)
38
Q

Incisal aspect

A

Labiolingual greater than mesiodistal dimension (opposite maxillary teeth).
(bolded)

39
Q

Root of mandibular central incisors

A

Root is convex labially and lingually and flattened mesially and distally (bolded)

40
Q

Pulp space morphology mandibular central incisors

A

TWO canals with prominent single pulp horn (bold)

41
Q

occlusion

A

with maxillary central incisor

Dental Anatomy 811 (4 decks)

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