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Lower Primary anterior teeth from CI to Canine
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MADIBULAR TEMPORARY ANTERIOR TEETH
GENERAL CHARACTERISTICS OF PRIMARY ANTERIOR TEETH
Smaller in size than the analogous secondary teeth
Whiter in color Crowns and roots of primary teeth have
a marked constriction at the cervix Labial cervical ridges more prominent
than in permanent teeth No mamelons on the incisal edges upon
eruption Roots are longer and narrower MD
MANDIBULAR TEMPORARY CENTRAL INCISOR
LABIAL Flat surface with no
developmental grooves Mesial and distal sides
of the crown are tapered evenly from the contact areas towards the cervix
Compared to permanent mandibular CI:
MD measurement is smaller
Lali measurement same
MANDIBULAR TEMPORARY CENTRAL INCISOR
LABIAL Crown is wide in
proportion to its length Resembles the
permanent maxillary lateral incisor
Root is long and tapers evenly to the apex
Root is pointed and almost twice the length of the crown
MANDIBULAR TEMPORARY CENTRAL INCISOR
LINGUAL Middle and incisal
thirds may have a flattened surface level with the marginal ridges or may have a lingual fossa
Has prominent cingulum slight lingual fossa and faint marginal ridges
Crown and root converge lingually
MANDIBULAR TEMPORARY CENTRAL INCISOR
LINGUAL Tooth is narrower
lingually Crown and root
converge lingually Tooth is narrower
lingually
MANDIBULAR TEMPORARY CENTRAL INCISOR
MESIAL Cervial line more
curved than in distal aspect
Incsal ridge centered on the root axis line
Convexity of the cervical contours labially and lingually at the cervical third is pronounced
Shows a prominent labial cervical ridge
MANDIBULAR TEMPORARY CENTRAL INCISOR
MESIAL Crowns are wide Lali
due to large cingulum Lali measurement is
only about a millimiter less than that of the primary maxillary central incisor
Root is nearly flat and evenly tapered
Root apex more blunt compared to labial and lingual aspects
MANDIBULAR TEMPORARY CENTRAL INCISOR
DISTAL Cervical line of the
crown is less curved Developmental
depression frequently evident on the distal side of root
MANDIBULAR TEMPORARY CENTRAL INCISOR
INCISAL Incisal ridge is
straight and bisects the crown Lali
Labial surface presents a flat surface slightly convex
Lingual surface presents a flat surface slightly concave
MANDIBULAR TEMPORARY CENTRAL INCISOR
INCISAL Has essentially equal
MD and Lali dimensions with temporary mandibular lateral incisor
Crown tapers towards the cingulum on the lingual side
TEMPORARY MANDIBULAR CANINES
TEMPORARY MANDIBULAR CANINES
Labial Aspect Crowns are longer inciso-
cervically than wide mesiodistally.
Sharp cusp tips like an arrow.
Roots are more tapered and pointed.
Roots shorter than temporary maxillary canines.
Cervical third of proximal crown margins do not converge cervically.
TEMPORARY MANDIBULAR CANINES
Labial Aspect No grooves on labial
surface. No style on incisal
margins. M & D heights of
contour are much nearer the cervix.
Labial surface is convex in all directions.
Three lobes Central lobe Mesial lobe Distal lobe
TEMPORARY MANDIBULAR CANINES
Lingual Aspect Cingulum reduced in
size and less prominent. Cingulum occupies less
than the cervical third of the height of crown.
Lingual ridges barely discernible.
Faint marginal ridges. Single concavity or
fossa. Cingulum narrow in
mesiodistal direction.
MESIAL AND DISTAL VIEW
Cervical ridges are prominent cusp tip is most often located
slightly lingual to the root axis line.
The cervical third of a primary canine is much thicker than incisor.
Cervical lines curve incisally more on the mesial side than on the distal side
The roots are bulky in the cervical and middle thirds, tapering mostly in the apical third where the apex is bent labially
TEMPORARY MANDIBULAR CANINES
Mesial Labial Border
slightly concave The border is divergent
from the long axis of tooth and extends from the mesio-incisal angle to the cervical border
Above the cervical border,the curvature increases as it rounds into the cervial constriction
Lingual Border convex and then
moderately concave before it enters into the convex cingulum.
TEMPORARY MANDIBULAR CANINES
Mesial surface Labial and lingual
borders are divergent inciso-
cervically
TEMPORARY MANDIBULAR CANINES
Mesial Surface Cervical Border
is evenly concave toward the root
Mesial surface of the crown
is convex in the incisal 2/3
Can be flatten or even become concave toward the center of the surface above the cervical line
TEMPORARY MANDIBULAR CANINES
Distal surface Cervical border
Evenly concave toward the root
Of the crown More extensive than
the mesial surface Evenly convex
TEMPORARY MANDIBULAR CANINES
Distal surface Labial border
Moderately concave And becomes convex
above the cervical constriction
Lingual border Firstly convex at the
short distance Then concave and
convex again Influenced by the
cingulum
TEMPORARY MANDIBULAR CANINES
Incisal Crown outline:
diamond- shaped nearly symmetrical,
except for the mesial position of the cusp tips
more bulky in the distal half
Crown is 0.4 mm wider MD than Lali
Cingulum centered or just distal to the center
Actual tooth
Cast