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  • 1

    How Does Shedding Occur?

    The permanent teeth exert pressure against

    Deciduous Teeth

    p gthe deciduous rootscausing their resorption Anterior Teeth

    Shedding (root resorption)takes about 3-4 years

    Posterior Teeth

    Retained Deciduous tooth

    Differences Between id & i iDeciduous & Permanent Dentition

    Anatomical

    Histological Histological

    Differences Between Deciduous & Permanent Dentition

    1. Number2. Size 3. Color4. Development5. Calcification6. Root Resorption7. Hardness8. Morphologic Differences

    1. Number1. Number2. Size 3. Color4. Development5. Calcification6. Root Resorption7. Hardness8. Morphologic Differences

    20 Deciduous TeethPredecessors

    Permanent Teeth32 successors

    Non-successors20

    12

  • 2

    The crowns are smaller

    2. Size1. Number2. Size3. Color4. Development5. Calcification6. Root Resorption7. Hardness8. Morphologic Differences

    The roots are shorter

    Whiter in color

    3. Color1. Number2. Size 3. Color4. Development5. Calcification6. Root Resorption7. Morphologic Differences

    Less whiter

    Deciduous Teeth

    Permanent Teeth

    Shorter time for crown development

    4. Development of Teeth

    1. Number2. Size 3. Color4. Development5. Calcification6. Root Resorption7. Hardness8. Morphologic Differences

    p( Deciduous incisor 4 M.I.U 4 M.)

    ( Permanent incisor 4 M. 4-5 Y.)

    Shorter time for complete

    Crown completed

    Evidence of calcification

    Deciduous Dentition

    4 M4 M.I.U. Central incisors

    5Shorter time for completeroot formation

    ( Deciduous incisor (1-1.5 Y.) ( Permanent incisor ( 2-3 Y.)

    5 M4.5 M.I.U Lateral incisors

    9 M5 M.I.U Canines

    6 M5 M.I.U. First molars

    10-12 M6 M.I.U Second molars

    Prenatal systemic disturbancesAffect calcification of primary teeth

    5. Calcification

    1. Number2. Size 3. Color4. Development5. Calcification6. Root Resorption7. Hardness8. Morphologic Differences

    Postnatal systemic disturbances

    Affect calcification of primary teeth

    yAffect calcification of permanent teeth

  • 3

    from the pressureDue to permanent successors

    1. Number2. Size 3. Color4. Development5. Calcification6. Root Resorption7. Hardness8. Morphologic Differences

    6. Root Resorption

    7. Hardness

    Less harder than permanent teeth

    8. Morphologic Differences

    Anterior Teeth

    1. Number2. Size 3. Color4. Development5. Calcification6. Root Resorption7. Hardness8. Morphologic Differences

    a. Wider mesiodistally in comparison to their length

    b. Prominent cervical ridge

    Crowns

    a. Narrowb. Labial inclination (upright position)c. Twice length of crown ( C1: R 2 )

    Roots

    Posterior TeethDeciduous Teeth

    a. Prominent buccal ridgeb. Constricted tooth neckc. Narrower occlusal surface buccolingually

    Crowns

    a. Slender, long & flatb. Flarying out apicallyc. Very short trunks or absent

    Roots

    lEnamel

    Enamel Dentin

    Pulp

    Histological Differences betweenDeciduous and Permanent Teeth

    Deciduous Molar

    Enamel

    DentinThin

    Dentinlimited thickness and less hardness

    Enamel-dentin junctionRelatively smooth

    Enamel

    Dentin

    Permanent Molar

  • 4

    Large size of the pulp and prominent pulp horns

    Permanent Molar

    Deciduous Molar

    Deciduous Teeth

    Morphology of TeethMorphology of TeethMorphology of TeethMorphology of Teeth

    M h ll i i

    It resembles the permanent maxillary central incisor EXPECT:

    DeciduousMaxillary Central Incisor

    Much smaller in size

    The crown mesiodistally is greater than cervicoincisally

    The labial surface is smooth without developmental lineswithout developmental lines

    The lingual surface shows less developed marginal ridge and cingulum

    It resembles the permanent maxillary lateral incisor EXCEPT:

    Deciduous Maxillary Iateral Incisor

    Deciduous Teeth

    Smaller than permanent lateral

    The crown length cervicoincisally is greater than its mesiodistal width

    The distoincisal angle is more rounded

  • 5

    Deciduous Maxillary Canine

    It is similar to the permanent maxillary canine EXCEPT:

    Deciduous Teeth

    Smaller in size

    More constricted at the cervix

    MCA & DCA at the center of the middle thirdmiddle third

    Longer and sharper cusp

    Root length twice crown length

    Deciduous Mandibular Canine

    It is similar to the permanent:EXCEPTmandibular canine

    Deciduous Teeth

    Smaller in size

    More pointed cusp tip

    Developmental depression along the labial surface of the root

    Deciduous MaxillaryFirst & Second molar

    Deciduous Teeth

    It is much wider PR

    Four cusps and three roots

    Deciduous Maxillary First Molar

    mesiodistally at the contact areas than at the cervix

    The occlusal line is scalloped with no definite cusp

    MBRDBR

    PR

    The buccal surface is smoothThe roots are long and slender with short root trunk Buccal Aspect

  • 6

    The crown converges in a lingual direction

    DeciduousMaxillary First molar

    DBRMLC is the longest and

    sharpest of all cuspsDLC cusp is poorly develop

    and sometimes absent

    All three roots are seen from

    PR

    MBR

    DBR

    All three roots are seen from this aspect and the palatal root is larger than the others

    MLC DLC

    Lingual Aspect

    Prominent cervical ridge

    h d

    DeciduousMaxillary First molar

    The crown is wider buccolingually at the cervical ridge than at the occlusal third

    MBR LR

    The LR appears slender and extends lingually to a marked degree Mesial Aspect

    Rectangular with shortest sides represented by the marginal ridges

    Four cusps and two fosse; central and mesial triangular

    DeciduousMaxillary First molar

    Oblique ridge connecting the MLC with DBC

    Central developmental grooveBuccal developmental groove

    Th d l t l MLC

    DBCMBC

    DLC

    Three developmental grooves radiating from the mesial triangle fossa; one buccally, one lingually and one toward the marginal ridge

    Occlusal Aspect

    Occlusal Aspect

    MBCBDG

    DBC

    MBC

    CDG

    MTFCF

    BDG

    MLCDLC

  • 7

    Five cusps and three rootsMBR

    DBR

    DR

    It is similar to the permanentmaxillary first molar EXCEPT:

    Deciduous Maxillary Second Molar

    The crown is more constricted at the cervix Prominent cervical ridge

    The rootsDBC MBC

    maxillary first molar EXCEPT:

    Root Trunk is short and sometimes absent

    More slender and twice the length of the crown and greatly flare out

    MLCDLC

    V

    d d b lDeciduous Mandibular First molar & Second molar

    Mesial outline is straight

    Four cusps and two roots

    Deciduous Mandibular First Molar

    Cervical line dipping apically where it joins with the mesial root

    DCA

    Distal outline is marked convex making the DCA extends distally to a great degree

    Mesial

    Roots long, slender and flaring greatly

    Short root trunk

    Buccal Aspect

    MRDR

    The crown and root

    DeciduousMandibular First MolarLingual Aspect

    converge lingually MLC DLC

    MLC is long & sharpDLC is rounded and well develop

  • 8

    The crown is roughly h b id l

    MBCMLC

    DeciduousMandibular First MolarMesial Aspect

    rhomboidal

    Prominent cervical ridge

    MBC & MLC connected by developed MMR

    MR

    by developed MMR

    Mesial rootParallel outlines with long developmental depression along the full length of the root

    Mesial Aspect

    MBCMLC

    DeciduousMandibular First Molar

    The prominent cervical ridge is observed from this aspect

    Occlusal AspectDeciduous

    Mandibular First Molar

    Four cusps , MLC is the largest cusp

    Central fossa and mesial

    CR

    Central fossa and mesial triangle fossa with CDG extends between them

    It has five cusps and two rootsIt is similar to the permanent

    Deciduous Mandibular Second Molar

    Smaller in size

    MBC, DBC, DC are almost equal in size

    MB DB DC

    p:EXCEPTmandibular first molar

    The roots are more slender, flaring out

    Short root trunk

  • 9

    DBC MBCDC

    Occlusal AspectDeciduous

    Mandibular second molar

    CF

    CDG

    MBTRDBTR

    MLTRDLTR

    DTR

    MTFDTF

    MLCDLC

    MLTR

    3 years oldOcclusal Dental formula

    A B C D EA B C D E

    A B B C C D D E EA M1/3 D 2/3 MS DS M 1/3 D 2/3 1/5 4/5

    Deciduous Teeth

    Occlusion of Deciduous Teeth

    Occlusal Dental formula

    A M1/3

    D2/3 MSDS M1/3

    D2/3 1/5 4/5

    5 years old

    Deciduous Teeth

    Occlusion of Deciduous Teeth

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