Sr Characteristics Maxillary Central Incisor Sr Characteristics Maxillary Lateral Incisor
no no
1 General characteristics 1 General characteristics
1a Arch Position >Adjacent to the midline 1a Arch Position >Second tooth from the midline
>Mesial contact area with each in euch qardant of the maxillary
other arch.
>Distal contact with lateral >Mesial contact with central
incisors incisor
>Distal contact the deciduous
canine
1b Universal Number Maxillary right central incisor - #8 1b Universal Number >Maxillary right lateral incisors-
Maxillary left central incisors - #9 #7
>maxillary left lateral incisors-
#10
1c General form and >Viewed from the labial & lingual 1c General form and >similar to central only smaller in
function aspects, the crown is trapezoidal in function size
shape >longer incisocervically and
>Widest mesiodistally of any narrower mesdiodistally
anterior tooth >Smaller and more rounded
>The crown is triangular in shape crown than central incisors
when viewed proximally.
2 Developmental >Initiation of calcification: 2 Developmental >Initiation of calcification:
Table 3 to 4 month Table 1 year
>Completion of enamel: >Completion:
4 to 5 years 4 to 5 years
>Eruption: >Eruption:
7 to 8 years 8 to 9
>Completion of root: >Completion of root:
10 years 11 years
3 Labial Aspect 3a Labial Aspect
3a General >Shape is trapezoidal.
>Crown is longer incisocervically
than mesiodistally. But almost
equal in dimension.
>Surface is convex, highest
convexity in the cervical third with
flatness towards incisal third.
3b Mesial outline >Crown is slightly convex but can 3b Mesial outline >The crown is smaller and more
be nearly straight rounded compared to the
>Crest of curvature at the contact maxillary central incisor, with a
area in the incisal third more pronounced curvature.
>The mesioincisal angle is rather >Slightly convex with a more
sharp rounded mesio-incisal angle.
3c Distal outline >Outline convex but more rounded >contact area in the incisal third at
then the mesial the junction of mid third.
>rounded distoincisal angle
3c
>crest of curvature at the contact Distal outline >Rounded distal margin
area which is at the junction of >crest of curvature more gingivally
insical and middle third. >rounded distoincisal angle
3d Incisal Outline >The incisal outline may exhibit 3d
mamelons Incisal Outline > Not so straight because of
>Generally straight and rounded angles.
perpendicular to long axis of tooth
, 3e Cervical Outline >The CEJ curves evenly 3e
toward the root Cervical Outline >same as central with less depth of
>The crown is narrow mesiodistally arc
at the cervical margin then the
incisal
3f Other >Developmental depressions: 3f
considerations Straight shallow depressions extend Other considertions >same as central
from the incisal edge toward the
gingival. Named mesiolabial and
distolabial divide into 3 lobes.
>
4 Lingual Aspect 3b Lingual Aspect
4a General >Trapezoidal >Mesial margin the mesial outline
>Slightly narrow mesiodistally to that of the central incisors
>Lingual Fossa : Large shallow
concavity in the insical third to two
third.
>Cingulum: Convexity in the
cervical portion.
no no
1 General characteristics 1 General characteristics
1a Arch Position >Adjacent to the midline 1a Arch Position >Second tooth from the midline
>Mesial contact area with each in euch qardant of the maxillary
other arch.
>Distal contact with lateral >Mesial contact with central
incisors incisor
>Distal contact the deciduous
canine
1b Universal Number Maxillary right central incisor - #8 1b Universal Number >Maxillary right lateral incisors-
Maxillary left central incisors - #9 #7
>maxillary left lateral incisors-
#10
1c General form and >Viewed from the labial & lingual 1c General form and >similar to central only smaller in
function aspects, the crown is trapezoidal in function size
shape >longer incisocervically and
>Widest mesiodistally of any narrower mesdiodistally
anterior tooth >Smaller and more rounded
>The crown is triangular in shape crown than central incisors
when viewed proximally.
2 Developmental >Initiation of calcification: 2 Developmental >Initiation of calcification:
Table 3 to 4 month Table 1 year
>Completion of enamel: >Completion:
4 to 5 years 4 to 5 years
>Eruption: >Eruption:
7 to 8 years 8 to 9
>Completion of root: >Completion of root:
10 years 11 years
3 Labial Aspect 3a Labial Aspect
3a General >Shape is trapezoidal.
>Crown is longer incisocervically
than mesiodistally. But almost
equal in dimension.
>Surface is convex, highest
convexity in the cervical third with
flatness towards incisal third.
3b Mesial outline >Crown is slightly convex but can 3b Mesial outline >The crown is smaller and more
be nearly straight rounded compared to the
>Crest of curvature at the contact maxillary central incisor, with a
area in the incisal third more pronounced curvature.
>The mesioincisal angle is rather >Slightly convex with a more
sharp rounded mesio-incisal angle.
3c Distal outline >Outline convex but more rounded >contact area in the incisal third at
then the mesial the junction of mid third.
>rounded distoincisal angle
3c
>crest of curvature at the contact Distal outline >Rounded distal margin
area which is at the junction of >crest of curvature more gingivally
insical and middle third. >rounded distoincisal angle
3d Incisal Outline >The incisal outline may exhibit 3d
mamelons Incisal Outline > Not so straight because of
>Generally straight and rounded angles.
perpendicular to long axis of tooth
, 3e Cervical Outline >The CEJ curves evenly 3e
toward the root Cervical Outline >same as central with less depth of
>The crown is narrow mesiodistally arc
at the cervical margin then the
incisal
3f Other >Developmental depressions: 3f
considerations Straight shallow depressions extend Other considertions >same as central
from the incisal edge toward the
gingival. Named mesiolabial and
distolabial divide into 3 lobes.
>
4 Lingual Aspect 3b Lingual Aspect
4a General >Trapezoidal >Mesial margin the mesial outline
>Slightly narrow mesiodistally to that of the central incisors
>Lingual Fossa : Large shallow
concavity in the insical third to two
third.
>Cingulum: Convexity in the
cervical portion.
