drg arie anatomy
TRANSCRIPT
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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
Mandibular 8st molar
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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
Mandibular 8st molar
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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
Mandibular 8st molar
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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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