drg arie anatomy

8/17/2019 Drg Arie Anatomy

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MORPHOLOGY OF DECIDUOUS TEETHMORPHOLOGY OF DECIDUOUS TEETH

Dental AnatomyDental Anatomy

Ari CahyonoAri Cahyono


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Deciduous dentition

Set traits

Smaller in size Smaller crown height/tooth length ratio

Greater crown width/height ratio


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Set traits More bulging B & L cervical ridges

Constricted cervix

Buccal cervical ridges on deciduous

molars

Occlusal asect! constricted occlusal table


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Deciduous dentition

Set traits Molar roots

" More slender & relativel# longer

" More bowed & $lared outward

" Shorter root trun%

Mil%white in color 'namel is thinner & ul chamber is large

Some class arch ! ty"e traits in "ermanent

#entition are a""lie# to #eci#$o$s #entition

Only ne% traits %ill &e #isc$sse#


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Deciduous incisors

'rution Mandibular be$ore maxillar# incisors

Central be$ore lateral incisors

(o mamelons) labial grooves or lobes


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Maxillar# Central incisor

*he onl# incisor with MD breadth +crown height

M & es, D ro$iles overhang root

ro$iles (o labial grooves) deressions or

lobes

Cingulum

Bulging & more incisall# located Ma# extend $urther toward the incisal

edge - lingual ridge .nmar%ed b# its or grooves

Ms are clearl# evident


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Maxillar# Central incisor

Constricted cervix $romall asects

0n roximal sur$acesCL is more convexincisall#

Conical root with

rounded aex Diamondshaed $rom

incisal asect


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Maxillar# lateral incisor

Much smaller than central M & D ro$iles are more in line

with root ro$iles

Distal incisal angle is more

rounded

Labial sur$ace is more convex

MD

Lingual $ossa is deeer Ms more rominent

CL is similar to that o$ central

ounded $rom incisal asect


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Mandibular central incisor

Bilaterall# s#mmetrical

12 degree M0 & D0 angles

0ncisal margin is horizontal

3rominent cingulum with lingual

margin extending incisall#

Ms are less mar%ed than those o$max, incisors

Lingual $ossa is shallower


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Mandibular central incisor

Labial sur$ace is $lat MD

CL is similar to that o$ Max, incisors

oot 4 times the height o$ the crown (arrow & conical with ointed aex


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Mandibular lateral incisor

0ncisal edge sloes distall#

D0 angle is rounded

D ro$ile is more rounded

Greater crown height/MD ratio than mand, central

LL diameter + MD


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Mandibular lateral incisor

Cingulum) $ossa & Msare similar to those o$

mand, Central oot

(arrow & conical 5ex has D inclination D sur$ace has narrow

vertical deression


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Maxillar# canine

MD width + crown height Labial or lingual views! diamond in

shae

M & D ro$iles overhang root6s

7OCs are much near the cervix than in ermanent

Labial & lingual cervical 8/4s aremar%edl# convex

M rominence is related to race Minimal in Caucasians 3rominent in Mongoloid

(o labial ridge or deressions


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Mandibular canine

Crown height + MD width Less cervicall# converging M & D

ro$iles

Labial or lingual asects! arrow in

shae (o labial ridge or grooves

7OCs are much near the cervix than

in ermanent

LL diameter 9 that o$ deciduousmax, canine

Less rominent cingulum or Ms &

shallower $ossae than in deciduous

max, canine


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Maxillar# 8st molar

Most at#ical o$ all rimar# or ermanent molars

0ntermediate between a remolar & a molar

Smallest molar in all but BL diameter


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Cuss Bicused :onl# MB & ML cus

are resent;

5 small DB cus is $re


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Buccal asect MD diameter ++ crown height M art is higher OC than D

because it is more ro=ectedcervicall# onto the root area Mar%ed cervical constriction oot

" >er# little root trun% " 4 roots strongl# divergent

" L root is midwa# between the ? Broots

Maxillar# 8st molar


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Mesial asect Mesial marginal groove B 7OC is more cervicall#

located than L Buccal cervical ridge is more rominent in 8st molars thanin ?nd

oots" B roots are straight & buccall#directed

" L root is banana shaed with

strong B curved aical 8/4

Maxillar# 8st molar


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Occlusal asect *raezoidal M & D ro$iles are straight & slightl# L convergent B cus + L B triangular ridge more rominent than L

B groove searates DB cus $rom MB Central it Central groove *ransverse ridge :obli


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Morhologicall# considereda model $or the ermanent8st maxillar# molar

5llows rediction o$ whatthe 8st maxillar# molar willloo% li%e

*his concordance is calledisomorh#

Set traits Cervical constriction Cervical 8/4 bulging Little root trun% oots thinner & divergent

Maxillar# ?nd molar


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Molari$orm unli%e max, 8st Acused tooth

Buccal asect ? cus! MB & DB

M hal$ + D hal$ M hal$ ro=ects more occlusall# &

occuies ?/4s o$ crown area M ro$ile is straight D ro$ile is curved and overhanging CL inclines downward $rom D to M oots

" ? divergent roots M & D

" M is longer

Mandibular 8st molar


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Lingual asect ? cuss! ML & DL

ML cus is conical & larger

than DL Outlines o$ B cuss are

visible

CL is more straight &horizontal than that o$ the B

asect



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Mesial asect Buccal cervical ridge :BC; rom MB cus ti a straight incline to

BC *ransverse ridge connecting MB & ML M M is high & rominent Mesial marginal groove searates M M

$rom ML cus ridge

CL is convex occlusall# & lower on the Bend oot

" 'xtremel# broad BL :sometimes as broadas the crown;

" re


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Distal asect 5ll A cuss & M root ro$iles

are visible

B ro$ile is less bulging than

$rom mesial asect D M is lower and less

rominent than M M

CL is more straight &horizontal than that o$ Masect



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Occlusal asect ithout the BC) it is rectangular BL width is grater $rom M than D MB cus is the largest) $ollowed b#

ML) DB & DL

M *ransverse groove) interruted b# Central groove extends $rom M it to

central it M it

" ? sulemental grooves o$ which MLcrosses M M

Central it B& L grooves O$ten a D it



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Morhologicall# considereda model $or the ermanent8st mandibular molar

5llows rediction o$ whatthe 8st mandibular molarwill loo% li%e

*his concordance is calledisomorh#

Set traits Cervical constriction Cervical 8/4 bulging Little root trun% oots thinner & divergent

Maxillar# ?nd molar


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Deciduous teeth size & erution

*oothCrownheight

MD crowndiameter

BL crowndiameter

*oothlength

5ge aterution

E8 or F8 F,2 mm F,E mm E,2 mm 8F,2 mm ,E mths

E? or F? E,F mm E,8 mm A,2 mm 8E,H mm H mths

H8 or 8 E,2 mm A,? mm A,2 mm 8A,2 mm F,E mths

H? or ? E,? mm A,8 mm A,2 mm 8E,2 mm mths

E4 or F4 F,E mm ,2 mm ,2 mm 81,2 mm 8F?2 mths

H4 or 4 F,2 mm E,2 mm A,H mm 8,2 mm 8F?2 mths

EA or FA E,8 mm ,4 mm H,E mm 8E,? mm 8?8F mths

EE or FE E, mm H,? mm 82,2 mm 8,E mm ?242 mths

HA or A F,2 mm , mm ,2 mm 8E,H mm 8?8F mths

HE or E E,E mm 1,1 mm H, mm 8H,H mm ?242 mths


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drg arie anatomy

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