lower primary anterior teeth from ci to canine

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