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Primary teeth:eruption, Anatomy and morphology

By: A. Rashed M.Assistant Professor of Pediatric Dentistry

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• Which primary teeth, erupt first?• When do they erupt?

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• Which primary teeth, erupt second?• When do they erupt?

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• Which primary teeth erupt third?• When do they erupt?

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• Which primary teeth fourth?• When do the erupt?

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Upper A > upper B

Lower A < lower B

Upper A & B > lower A & B

(permanent and primary)

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Primary versus permanent incisors

• Size• Mesio-distal/inciso cervical• Incisal edge • Color• Cervical tapering

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Clinical situation

Chief complaint: My daughter’s permanent teeth are yellow

and big! Can they be restored and bleached?!...

How old is the child?

What will you answer?

Will the appearance improve?

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Cervical tapering?

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• What are the erupt fifth?• When do they erupt?

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• What primary teeth erupt fifth?• When do they erupt?

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How old is this baby?What problems may these teeth cause?

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• What primary teeth erupt 6th?• When do they erupt?

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• What primary teeth erupt 7th?• When do they erupt?

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Early childhood caries (ECC) :nursing caries: baby bottle tooth decay

mostly involved teeth:maxillary incisors

maxillary primary first molarsmandibular primary first molars

Mandibular incisors are not usually involved

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Why do you thinkmandibular incisors are not usually involved?

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Why do you think maxillary incisors,

maxillary primary first molars, andmandibular primary first molars

are involved more that other teeth?

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What can we do to prevent ECC?

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What primary teeth erupt 8th?When do they erupt?

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What primary teeth erupt last?When do they erupt?

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Lunch time!