Mandibular Incisors Flashcards
What are the numbers of the mandibular central incisors?
24 & #25
What are the numbers of the Mandibular lateral incisors?
23 and #26
Where two adjacent teeth contact:
Interproximal contact
The spaces/spillways that widen out from the contact are called:
Embrasures
Anterior teeth have 4 embrasure spaces:
Incisal, gingival (cervical), facial, lingual
Which is larger in anterior teeth, the incisal or gingival embrasure?
Gingival
Which is large in anterior teeth, the facial or lingual space?
They’re equal
Posterior teeth have 4 embrasure spaces:
Occlusal, gingival (cervical), facial, and lingual
In posterior teeth, is the occlusal or gingival embrasure larger?
They’re equal
Which is larger in posterior teeth, the facial or lingual embrasure?
Lingual
Label
A: gingival (cervical) embrasure
B: incisal embrasure
C: facial embrasure
D: lingual embrasure
Label:
A: occlusal embrasure
B: gingival (cervical) embrasure
C: facial embrasure
D: lingual embrasure
The mandibular incisors are used to:
Cut/ incise food
How many mandibular incisors are there?
4
Mandibular incisors have smaller ____ than any other tooth.
Mesiodistal diameters
Mandibular central incisors are the:
Smallest tooth
In the mandibular arch, what is smaller, the central or lateral incisors?
Central incisors
Mandibular incisors are broader ____ than _____.
Buccolingually (BL) than Mesiodistally (MD)
What outline is the mandibular central incisor?
Trapezoidal
The mandibular central incisor tapers:
Cervically
Describe the incisal outline of the mandibular central incisor:
Straight
What is present on the mandibular central incisors when the tooth erupts?
Mamelons
The crown is approximately 2x as ____ as it is ____.
2x as long IG as it is wide MD
From a facial view of a mandibular central incisor, the mesial and distal outlines are _____ and taper to the ___.
Straight up to the contact areas and taper to the cervix
From a facial view of a mandibular central incisor, the mesioincisal and distoincisal line angle are:
Sharp 90 degree angles
The mandibular central incisor is often described as the:
Only symmetrical tooth in the mouth
From a facial view of a mandibular central incisor, the mesial and distal contact areas are in the:
Incisal 1/3
From a facial view of a mandibular central incisor, both contacts:
Are at the same level
In most teeth, the _____ contact is positioned more cervically than the ____ contact (even if it located in the same 1/3 or junction)
Distal contact ; mesial contact
From a facial view of a mandibular central incisor, describe the length of the crown relative to the root
Crown is shorter than root
From a facial view of a mandibular central incisor, describe the labial surfaces:
Smooth, no developmental depressions
From a facial view of a mandibular central incisor, the labial surface is ______ in the _____ and becomes more ____ ______.
Flat in the incisal 1/3; more convex cervically
From a facial view of a mandibular central incisor, describe the # of roots
Single root
From a facial view of a mandibular central incisor, describe the root:
Narrow MD and curves distally in some cases
From a lingual view of a mandibular central incisor, the crown is _____ in outline.
Trapezoidal
From a lingual view of a mandibular central incisor, the crown is smooth and rounded, slightly concave but has no:
Distinct lingual fossa
From a lingual view of a mandibular central incisor, we can see ____ and only minor elevations.
Mesial and distal marginal ridges
From a lingual view of a mandibular central incisor, describe the cingulum when compared to a maxillary incisor:
Music less distance than in the maxillary incisor
From a lingual view of a mandibular central incisor, is a developmental groove present?
No
From a mesial view of a mandibular central incisor: the tooth is _____ in outline.
Triangular
From a lingual view of a mandibular central incisor, the labial outline is:
Curved (convex)
From a lingual view of a mandibular central incisor, the height of contour of the labial surface is in the:
Cervical 1/3
From a mesial view of a mandibular central incisor, the incisal edge lies _____ to the line the bisecting root
Lingual
From a mesial view of a mandibular central incisor, when worn, the incisal edge angles to the:
Facial
From a mesial view of a mandibular central incisor, the CEJ curves ____ about 1mm more than on the _____
Incisally ; distal
In a mandibular central incisor, the CEJ curves incisally about 1mm more on the ___ than it does on the ____.
Mesial than it does on the distal
On the mandibular central incisor, when worn, the incisal edge angles to the:
Facial
From a mesial view on the Mandibular central incisor, the cervical line extends 1mm more apically on the ____ than on the _____
Lingual; labial
When discussing the mandibular central incisor, the teeth are broader ____ than ____.
Labiolingually than mesiodistally
From a mesial view on the Mandibular central incisor, the crown may have a concavity below the _____ and above the _____
Middle 1/3; cervical line
From a mesial view on the Mandibular central incisor, the root extends straight from the CEJ and tapers apically from the:
Middle 1/3
From a mesial view on the Mandibular central incisor, the root may have a broad ______ along its length
Developmental depression
From a distal view on the Mandibular central incisor, compared to the mesial view the cervical curves incisally 1mm _____ than on the mesial
Less
From a distal view on the Mandibular central incisor, the developmental depression on distal of root is ____ than on the mesial
Greater
From a incisal view on the Mandibular central incisor, what is obvious about the tooth?
The symmetry
From a incisal view on the Mandibular central incisor, the incisal edge is at _____ to a line bisecting the crown ______.
Right angles; labiolingually
From a incisal view on the Mandibular central incisor, the incisal edge lies ____ to the center of the tooth
Lingual
From a incisal view on the Mandibular central incisor, the tooth converges ____.
Lingually
From a incisal view on the Mandibular central incisor, the MD width of the ____ surface is wider than the MD width of the ___ surface
Labial; lingual
From a incisal view on the Mandibular central incisor, the contact areas are centered _____.
Number of roots in a mandibular central incisor:
Single
In a mandibular central incisor, the root is broader ___ than ____.
FL than MD
On the root of the mandibular central incisor, developmental depressions run longitudinally down root on ___ and ___.
Mesial & distal
On the mesial and distal sides of the root of the mandibular central incisor, what are present?
Developmental depressions
On a mandibular central incisor, the ___ depression on the root is usually deeper than the _____ depression
Distal depression; mesial depression
On a mandibular central incisor, the cross section of the root is what shape? And contains:
Round/ovoid ; depressions on mesial and distal
How many pulp canals are present in the root of the mandibular central incisor?
Usually 1
Describe the pulp canal MD and FL of the mandibular central incisor:
MD= narrow
FL= broad
~40% of the time in the mandibular central incisor, how many pulp canals are present
Two
If two pulp canals are present in the mandibular central incisor, what are the names?
Facial and lingual canals
Label:
Facial
Lingual
Incisal
Mesial
Distal
The mandibular lateral incisor resembles what tooth?
Mandibular central incisor
What is larger, the mandibular central or mandibular lateral incisor?
Mandibular lateral incisor
How is the mandibular lateral incisor larger than the mandibular central incisor?
Wider MD
Since the mandibular lateral incisor is wider MD than the mandibular central incisor, all the extra width appears to be added:
To distal aspect of tooth
Label:
Left: mandibular lateral incisor
Right: mandibular central incisor
Label each view of the mandibular lateral incisor
Facial
Lingual
Incisal
Mesial
Distal
From a facial view on the Mandibular lateral incisor, the distal crown height is often ____ compared to the mesial crown height:
Shorter
From a facial view on the Mandibular lateral incisor, the incisal edge slopes:
Downward distally
From a facial view on the Mandibular lateral incisor, the mesioincisal angle is:
A sharp 90 degrees
From a facial view on the Mandibular lateral incisor, the distoincisal angle is:
Rounded
From a facial view on the Mandibular lateral incisor, the lateral is wider ____ than the compared to the central incisor
MD
From a facial view on the Mandibular lateral incisor, the mesial and distal contacts are in the:
Incisal 1/3
From a facial view on the Mandibular lateral incisor, although both mesial and distal contacts are in the incisal 1/3, the distal contact is:
More cervical
From a lingual view on the Mandibular lateral incisor, compare the lingual surface to the mandibular central incisors lingual surface
Same
In the mandibular lateral incisor, the mesial and distal views are:
Quite similar
The developmental depressions on the mesial and distal surfaces of the root on the mandibular lateral incisor are _____ than on the mandibular central incisor
More pronounced (deeper)
On the mandibular lateral incisor, compare the distal and mesial root depressions:
Distal root depression is more marked than on mesial
On the mandibular lateral incisor, the distal aspect is:
Twisted lingually
When the mandibular lateral incisor is viewed from the distal, what cannot be seen?
Lingual surface (marginal ridge)
Label:
Left- mesial
Right- distal
From the incisal view of the mandibular lateral incisor, the Incisal edge is ____ to the center of the tooth
Lingual
From the incisal view of the mandibular lateral incisor, the tooth is not _______.
Symmetrical
From the incisal view of the mandibular lateral incisor, the tooth is not symmetrical, the distal part of the crown appears to be curved ____.
Lingually
From the incisal view of the mandibular lateral incisor, the _____ line angle is positioned more lingual
DF
The root and pulp of the mandibular lateral incisor is similar to the central incisor but:
Slightly larger
Describe the cross-sectional root shape of the mandibular lateral incisor:
Ovoid/round
When viewing the root of the mandibular lateral incisor, the depression on the distal is ____ than in the central incisor.
Deeper
How many pulp canals are present typically in the the mandibular lateral incisor?
Single
~40% of the time in mandibular lateral incisors, ____ canals are present:
2
Label:
Facial
Lingual
Incisal
Mesial
Distal
