Maxillary Central and Lateral Incisors
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What are the numbers of the Central and Lateral incisors , Maxillary and Mandibular ?
Which central incisors are larger , the mandibular or maxillary ?
- Maxillary -7, 8, 9 , 10
- Mandibular - 23,24,25,26
Maxillary are larger
Draw a tooth with the following terms and define them ?
Cervical line (CEJ)
Mamelons - projections on the incisal edge
Cervical line (CEJ) -line where cementum and enamel meet
Cingulum - a projection on the lingual side of the tooth
Lingual Fossa- the depression on the lingual side
Marginal Ridge - The ridges along the depression running cervical to incisal
Which CEJ is more severe , the mesial or distal line ?
The mesial CEJ is much more severe.
What are at least five common traits of the central incisor ?
- King's crown lingual fossa
- Marginal ridges are more parallel
- cingulum present
- 2 to 3 mamelons
- triangle from incisal view
- Largest M-D incisal lenght
Where are the maxillary central incisors located ?
Do they touch at there adjacent mesial surfaces ?
What are they numbered ?
They have the smallest M-D of all anterior teeth?T or F ?
They are located at the midline
Yes , they have adjacent mesial surfaces
# 8 and 9
False , they are the widest M-D
What is the basic crown shape facially of the maxillary central incisor ?
Is the surface generally flat ? Y or N
Are there developmental depressions visible? Y or N
Basic crown shape is trapezoidal
Is the incisal edge parallel to the long axis ? Y or N ?
Where is the facial height of contour located incisal , middle , or cervical third ?
When are mamelons visible ?
No , it is perpendicular to the long axis.
They are usually seen in newly erupted teeth , but can also be seen if teeth are not worn down.
Which side is more straight on the Maxillary central Incisor , Distal or Mesial ?
Which angle is the sharpest , the DI or MI ?
Where is the Mesial Contact located in terms of (HOC) third ?
The mesial side is more straight while the distal curves outward.
The MI is much sharper
Mesial contact area (HOC) at Incisal third
Which outline is more convex on the 8 and 9 teeth ? Distal or Mesial ?
Which angle is more rounded ? the DI or MI?
Where is the distal contact (HOC) located on the distal side of the 8 and 9 tooth ?
It is located at the juntion Incisal-middle third.
What is the anatomical feature that lies immediate to the mesial ridge ?
Which teeth have cingulum ?
Which teeth have the height of
contour at the cervical third ?
All Anterior teeth - 12
All Anterior teeth - 12
From the Mesial view what does the crown of the maxillary central incisor look like ?
Is the incisal edge along the axis to the apex of the root ? Y or N
What third is the mesial contact area in ?
Crown basically triangular
- Mesial contact area is at Incisal third
What is the ratio of the crown at root ?
2/5 crown and 3/5 root.
Name 4 characteristics that show you have a Central Maxillary Incisor ?
- Presence of incisal edge, sloping lingually
- M-D width broad (8-9 mm)
- Relatively flat facial surface
- M and D incisal corners relatively sharp
How do you tell the difference between the Left and Right Central Maxillary Incisors ?
•Mesial outline straighter than distal* (distal has more convexity than mesial)
•MI angle is sharper than DI*
•Mesial height of contour more incisal than distal*
•CE line curvature is more on the mesial than the distal
Where is the lateral maxillary incisors located ?
What are the Universal numbers associated with those teeth ?
What is different about the central and lateral maxillary teeth?
Second tooth from mid-line, Between maxillary central and maxillary canine
#7 and #10
It tends to be more rounded , smaller in all dimensions except for root.Displays more variation in form*
What is the most special thing about the maxillary lateral incisor ?
Displays more variation in form* of all incisors ,however the 3rd molar shows more variation.
What is similar about lateral and central maxillary incisor ?
It generally has smaller dimensions , but the ROOT ASPECT IS THE SAME crown 2/5 root 3/5
Is the mesial outline of the lateral maxillary incisor more convex than the central maxillary incisor ? Y or N
- Y, the mesial outline of the lateral is more convex than the central.
Is the distal or mesial outline more convex on the maxillary lateral incisor ?
- The Distal Incisal corner is much more convex.
Which incisor has the greatest rounding ?
Which has a deeper lingual fossa , lateral or central maxillary incisors ?
What is the shape of the lateral maxillary incisor lingual fossa ?
Which of the two have more prominent marginal ridges ?
Which has a lingual pit ?
Maxillary lateral incisors
lateral maxillary incisors
Pope's hat or triangular
lateral maxillary incisors have more prominent ridges.
Lateral maxillary incisor
Is the facial outline of the maxillary lateral incisor convex ? Y or N
Is the lateral maxillary incisor's lingual outline U shaped looking from the mesial or distal view ?
Is the Incisal edge inline with the axis of the tooth ? Y or N
No, it is S-shaped
Is the height of contour more cervical or incisal on the Maxillary lateral Incisor ?
It is more cervical and similar to it's mesial side.
Does the maxillary lateral incisor have more convexity than the maxillary central incisor? Y or N
Compare and contrast the MD and FL lengths of this tooth? is it the same or different ?
Where is the Incisal edge located relative to facio-lingual dimension ?
MD ≥ FL dimension
- It is right in the middle
How many roots does the lateral maxillary incisor possess ?
Which way does the root/s face ?
A single Root
the root is deflected distally
Which tooth has more variations then the maxillary incisor lateral ?
Can this tooth be congenitally missing ? Y or N
Do these teeth ever have a peg shaped form ? Y or N
the 3rd molar
How do you tell if you have Maxillary Lateral Incisor ?
•Smaller in size than max central
•More distinct lingual anatomy
•Presence of deeper lingual fossa
•Presence of lingual pit
•Incisal outline more rounded
•M and D outlines more rounded
How do you tell if you have a right or left Maxillary Lateral Incisor ?
•MI corner sharper than DI corner*
•Mesial height of contour more incisal than distal’s*
•Distal outline more convex*
•Apex deflected distally
Explain the aspects of measurement ?
What teeth have Lingual Fossa ?
Which incisor is most rounded ?
Maxillary lateral incsor
Explain the difference between the MD vs FL from the incisal view of the Central and Lateral Incisor ?
- Central Incisor - MD > FL
- Lateral incisor - MD > FL
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