MAXILLARY PERMENENT LATERAL INCISOR

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GOOD MORNING GOOD MORNING

MAXILLARY PERMANENT LATERAL INCISORS:

MAXILLARY PERMANENT LATERAL INCISORS MAXILLARY PERMENENT LATERAL INCISOR

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PRESENTING BY AISWARYA DILEEP 1 st BDS NO :7

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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 .

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TOOTH NUMBERING SYSTEMS UNIVERSAL SYSTEM - 7,10 ZSIGMONDY / PALMER - 2 2 FDI SYSTEM - 12,22

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CHRONOLOGY First evidence of calcification : 10-12 months Enamel completed : 4-5 years Eruption : 8-9 years Root completed : 11 years

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DIMENSIONS Cervico incisal Length of crown : 9.0 mm Length of the root : 13.0 mm Mesiodistal diameter of crown : 6.5 mm Mesiodistal diameter of crown at cervix : 5.0mm Labio or Buccolingual diameter of crown : 6.0 mm Labio or Buccolingual diameter of crown at cervix : 5.0 mm Curvature of cervical line - Mesial : 3.0 mm Curvature of cervical line –Distal : 2.0 mm

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ASPECTS

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LINGUAL ASPECT (PALATAL) Marginal ridges and Cingulum are more prominent Fossa 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

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MESIAL ASPECT The crown is shorter and root is relatively long. The curvature of the cervical line is marked in the direction of the incisal ridge Labial outline of the root from this aspect is straight Cingulum often appears more convex in outline Root appears as a tapered cone with bluntly rounded apical end Line drawn through centre of the root tends to bisect the incisal ridge of the crown

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DISTAL ASPECT Width of the crown distally appears thicker than it does on the mesial aspect from marginal ridge to labial face Curvature of the cervical line is usually a millimeter or so less in depth than on the mesial side A 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

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INCISAL ASPECT It sometimes resembles central incisor or canine It is more or less ovoid in form Cingulum may be large ,as is the incisal ridge Labiolingual dimensioon may be greater than usual in comparison with mesiodistal dimension Exhibit more convexity labially and lingually from incisal aspect than maxillary central incisor The 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

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TRAITS ARCH TRAITS MAXILLARY LATERAL INCISOR Rectangular , broader crown Mesial and distal out line is convex Mesioincisal and distoincisal angle is rounded Prominent marginal ridge Fossa will be deep and ‘V’ shaped More prominent cingulum MANDIBULAR LATERAL INCISOR Long and narrower mesiodistally Long Mesial and distal out line is straight Mesioincisal and distoincisal angle is straight and sharp Less prominent marginal ridge No fossa Less prominent cingulum

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TYPE TRAITS CROWN LABIAL ASPECT Mesiodistally Mesioincisal angle Distoincisal angle Mesial profile Distal profile Mesial contact Distal contact Labial surface LINGUAL ASPECT Marginal ridges and cingulum Lingual fossa CENTRAL INCISOR Wide Sharp (90 degrees) Slightly rounded Straight Round Incisal third Junction of incisal and middle thirds Relatively flat Moderately pronounced Moderately deep LATERAL INCISOR Narrow Slightly rounded Distinctly rounded Slightly rounded Highly rounded Junction of incisal and middle third Middle third Rounded More prominent Deep

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CROWN 3. MESIAL ASPECT CEJ Contact area Cingulum 4. INCISAL ASPECT Outline Labial surface Lobes Mesio and Distolabial angles CENTRAL INCISOR Moderately curved Incisal third Moderately convex Triangular Slightly convex Visible labially Prominent LATERAL INCISOR Less curved Junction of incisal and middle third Convex Ovoid Highly convex Slightly visible to absent Rounded

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THANK YOU