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1Mandibular Permanent Lateral Incisor

Labial/

BuccalGeometric

outline of

the crown

Trapezoid

Small uneven side cervically and

Long side occlusally

Outlines

of the

crownand root

Crown Outline

Mesial outline is very slightly convex with distal outline

more convex Mesio-incisal angle is sharp

Disto-incisal angle is rounded

Incisal edge is sloping distally; if the tooth is newly

erupted, the mamelones will be seen. Mamelones are

small projections of enamel present on the incisal 1/3 of

newly erupted teeth.

Root Outline The mesial and distal outline of the root tapered to a

point of apex

Centralized on a long axis with the apex curved distallySurface

anatomy

of the

crown

and root

Elevations

Crown surface is smooth and convex with maximum

convexity at the cervical 1/3 representing the cervical

ridgelinear elevation found on cervical 1/3 on the

labial/Buccal aspect of all teeth.

Root surface is smooth and convex

Depression

Shallow developmental grooves could be seen separating

the mamelonesdevelopmental grooves are linear

depressions representing the complete union or fusion

of the lobes

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2Mandibular Permanent Lateral Incisor

Palatal/

LingualGeometric

outline of

the crown

Trapezoid

Small uneven side cervically and

Long side occlusally

Outlines

of the

crownand root

Lingual outline is reverse of labial outline

Crown Outline Mesial outline is very slightly convex with distal outline

more convex

Mesio-incisal angle is sharp

Disto-incisal angle is rounded

Incisal edge is sloping distally; if the tooth is newly

erupted, the mamelones will be seen. Mamelones are

small projections of enamel present on the incisal 1/3 of

newly erupted teeth.

Root Outline

The mesial and distal outline of the root tapered to apoint of apex

Centralized on a long axis with the apex curved distally

Surface

anatomy

of the

crown

and root

Elevations

Mesial and Distal Marginal ridgeMesial and Distal

marginal ridges are linear elevations found on the

lingual aspect of all anterior teeth located on the mesial

and distal borders of each tooth.

Cingulum is twisted distallylinear elevation found on

the lingual aspect of all anterior teeth located on the

cervical 1/3 of the tooth.

Incisal RidgeLinear elevation found on the lingual

incisal 1/3 of incisors

Depressions

Lingual Fossalinear depression found on the lingual

aspect of all anterior teeth

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3Mandibular Permanent Lateral Incisor

Mesial

and

Distal

Geometric

outline of

the crown

Triangular in shape

Base is cervically

Apex incisally

Outlinesof the

crown

and root

Crown OutlineLabial: convex with maximum convexity at the cervical 1/3

which represents cervical ridge Linear elevation found on

the cervical 1/3 of labial/buccal aspect of all teeth

Lingual:

Convex incisally which represent incisal ridge

Concave in middle 1/3 which represent lingual fossa

Linear elevation found on the lingual incisal 1/3 of

incisors

Convex cervically which represent cingulum linear

elevation found on the lingual aspect of all anterior teethlocated on the cervical 1/3 of the tooth.

Cervical: curves incisally (Mesial is always more curved than

distal)

Root Outline

The outline are nearly straight from the cervical line to the

middle 1/3 then tapered to a pointed apex

Surface

anatomy

of the

crown

and root

The crownhave smooth and convex proximal surfaces

Mesial contact area is in the centre of incisal 1/3

Distal contact area is in the junction of middle and

incisal 1/3

The Rootis smooth but have longitudinal developmental

depressions which is deeper distally than mesially.

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4Mandibular Permanent Lateral Incisor

Occlusal Geometric

outline of

the crown

Diamond shaped

Labiolingual dimension is greater than the

mesiodistal dimension

Outlinesof the

crown

and root

Crown OutlineConvex labially and tapers lingually due to

lingual convergence.

Root Outline

can not be seen from this view

Surface

anatomy

of the

crown

and root

Elevations

Cingulum is twisted distally, found

lingually

Incisal ridge

Incisal edge is sloping distally

Cervical ridge found labially Mesial and Distal Marginal ridge

Depressions

Lingual fossa