maxillary permenent lateral incisor
TRANSCRIPT
GOOD MORNINGGOOD
MORNING
MAXILLARY PERMANENT LATERAL INCISORS
MAXILLARY PERMENENT LATERAL INCISOR
PRESENTING BY AISWARYA DILEEP 1st BDS NO :7
INTRODUCTION
There are four lateral incisors in both arches The Maxillary lateral incisor is a tooth that is located mesially from both side of maxillary central incisors . Distally from both side of maxillary canines. It supplements central incisors in function they are similar anatomically . Functions are shearing or cutting food ,helps in speech and support for lips.
TOOTH NUMBERING SYSTEMSUNIVERSAL SYSTEM - 7,10
ZSIGMONDY / PALMER - 2 2
FDI SYSTEM - 12,22
CHRONOLOGY •First evidence of calcification : 10-12 months•Enamel completed : 4-5 years•Eruption : 8-9 years•Root completed : 11 years
DIMENSIONS
Cervico incisal Length of crown : 9.0 mmLength of the root : 13.0 mm Mesiodistal diameter of crown : 6.5 mmMesiodistal diameter of crown at cervix : 5.0mmLabio or Buccolingual diameter of crown : 6.0 mmLabio or Buccolingual diameter of crown at cervix : 5.0 mmCurvature of cervical line -Mesial : 3.0 mmCurvature of cervical line –Distal : 2.0 mm
ASPECTS
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LINGUAL ASPECT (PALATAL)Marginal ridges and Cingulum are more prominentFossa will be rounded at the mesiomarginal ridge which is straight and longer whereas distal marginal ridge will be slightly curved and small.Root is narrower
MESIAL ASPECTThe crown is shorter and root is relatively long.The curvature of the cervical line is marked in the direction of the incisal ridgeLabial outline of the root from this aspect is straightCingulum often appears more convex in outlineRoot appears as a tapered cone with bluntly rounded apical endLine drawn through centre of the root tends to bisect the incisal ridge of the crown
DISTAL ASPECT
Width of the crown distally appears thicker than it does on the mesial aspect from marginal ridge to labial faceCurvature of the cervical line is usually a millimeter or so less in depth than on the mesial sideA developmental groove present distally on this crown extending on the root The distal contact area is located farther from the incisal margin as compared to the mesial contact area
INCISAL ASPECT
oIt sometimes resembles central incisor or canineoIt is more or less ovoid in formoCingulum may be large ,as is the incisal ridgeoLabiolingual dimensioon may be greater than usual in comparison with mesiodistal dimensionoExhibit more convexity labially and lingually from incisal aspect than maxillary central incisoroThe mesiolabial and distolabial line angles are much more rounded and the lobes of labial surface are less clearly demarcated in the lateral incisors is,because of the high degree of convexity of the labial surface
TRAITS
ARCH TRAITS MAXILLARY LATERAL INCISOR
1. Rectangular , broader crown2. Mesial and distal out line is
convex3. Mesioincisal and distoincisal
angle is rounded 4. Prominent marginal ridge5. Fossa will be deep and ‘V’
shaped
6. More prominent cingulum
MANDIBULAR LATERAL INCISOR
1. Long and narrower mesiodistally
2. Long Mesial and distal out line is straight
3. Mesioincisal and distoincisal angle is straight and sharp
4. Less prominent marginal ridge
5. No fossa 6. Less prominent cingulum
TYPE TRAITS CROWN
1. LABIAL ASPECT
MesiodistallyMesioincisal angle Distoincisal angleMesial profileDistal profile Mesial contact
Distal contact
Labial surface
2. LINGUAL ASPECT
Marginal ridges and cingulum
Lingual fossa
CENTRAL INCISOR
WideSharp (90 degrees)Slightly roundedStraightRoundIncisal third
Junction of incisal and middle thirdsRelatively flat
Moderately pronounced
Moderately deep
LATERAL INCISOR
NarrowSlightly roundedDistinctly roundedSlightly roundedHighly roundedJunction of incisal and middle thirdMiddle third
Rounded
More prominent
Deep
CROWN
3. MESIAL ASPECT
CEJContact area
Cingulum
4. INCISAL ASPECT
OutlineLabial surfaceLobesMesio and Distolabial angles
CENTRAL INCISOR
Moderately curvedIncisal third
Moderately convex
TriangularSlightly convexVisible labiallyProminent
LATERAL INCISOR
Less curvedJunction of incisal and middle thirdConvex
OvoidHighly convexSlightly visible to absentRounded
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