jameel

3. MORPHOLOGY OF DECIDUOUS TEETHMORPHOLOGY OF DECIDUOUS TEETH

4. Deciduous dentition
Set traits
Smaller in size
Smaller crown height/tooth length ratio
Greater crown width/height ratio

5. Set traits
More bulging B & L cervical ridges
 Constricted cervix
Buccal cervical ridges on deciduous
molars
 Occlusal aspect: constricted occlusal table

6. Deciduous dentition
Set traits
Molar roots
• More slender & relatively longer
• More bowed & flared outward
• Shorter root trunk
Milk-white in color
Enamel is thinner & pulp chamber is large
Some class, arch & type traits in permanent
dentition are applied to deciduous dentition
Only new traits will be discussed

7. Pulp chamber deciduous v/s
permanent teeth

8. Dental formula

10. Deciduous teeth

11. Deciduous incisors
Eruption
Mandibular before maxillary incisors
Central before lateral incisors
No mamelons, labial grooves or lobes

12. Maxillary Central incisor
UNS--------------------E| |F
FDI--------------------- 51, 61
Eruption time------- 7.5months(FULLER)
Order----------------- 1
Shedding----------- 6-7 years

13. Maxillary Central incisor
Increased mesiodistal width of crown.
Rounded mesioincisal and
distoincisal angle than permanent
successor.
No mamelons on incisal surface+ flat
incisal surface
No labial grooves, depressions or
lobes
Pronounced bulge on labial surface.

14. Maxillary Central incisor
Prominent cingulum.
Prominent marginal
ridges
Deeper lingual fossa.
No lingual pit

15. Maxillary Central incisor
MESIAL ASPECT: wider
labiolingually
Cervical line exhibits less
curvature incisally.
DISTAL ASPECT:
Cervical line curvature
less on distal surface as
compared to mesial
surface.

16. Maxillary Central incisor
Incisal Aspect
Straight incisal edge
Divides the crown into
equal labial and
lingual portions.
Greater mesiodistal
width.

17. Maxillary Central incisor
Single root
Tapers evenly to the
apex
Root longer reltive to
crown length.

18. Maxillary lateral incisor
UNS--------------------D| |G
FDI--------------------- 52, 62
Eruption time------- 9 months(FULLER)
Order----------------- 2
Shedding------------ 7 -8 yrs

19. Maxillary lateral incisor
Much smaller than central
(trapezoidal labially, triangular
proximal aspect)
Crown is wider incisocervically
than mesiodistally.
Distoincisal angle more rounded
than mesioincisal angle
Marginal ridges on lingual
surface more prominent
Deeper lingual fossa.
Lingual fossa is deep

20. Maxillary lateral incisor
Incisal aspect
Much narrower
mesiodistal dimension
more rhomboidal &
more convex.

21. Maxillary lateral incisor
ROOT
Lateral incisor root
relatively longer
Apex not so rounded.

22. Mandibular teeth

23. Mandibular central incisor
UNS-------------------- P, O
FDI--------------------- 81, 71
Eruption time------- 6 months(FULLER)
Order----------------- 1
Shedding------------ 6-7 yrs

25. Mandibular central incisor
Chisel shape incisor morphology
Sharp mesioincisal and distoincisal
angles to the cervial line(90 DEGREES)
Incisal margin straight,no mamelons.
Smooth labial surface lacking
developmental depressions.
Flatter than labial surface of permanent
incisors.
Labially symmetrical crown
Bulge on labial surface at CEJ.

26. Mandibular central incisor
Well developed
lingual cingulum
Less defined marginal
ridges than those of
maxillary deciduous
central incisor.
Shallow lingual fossa

27. Mandibular central incisor
Proximal aspect;
Triangular in shape/ wedge shaped
when seen from mesial or distal
aspect.
Incisal edge located over root centre.
Cervical line contour evenly curved
towards incisal.
Greater labiolingual width than that of
permanent incisors.
Distal aspect shows less depth of
curvature towards incisal.

28. Mandibular central incisor
Straight incisal edge
Divides the labial and
lingual portions of the
crown into nearly equal
halves.
In deciduous maxillary
central incisor the crown
is wider MD.
M & D portions of crown
symmetrical

29. Mandibular central incisor
Single ,long ,slender
Convex labial and
lingual surfaces.
Flattened mesial and
distal surfaces.

30. Mandibular lateral incisor
UNS--------------------Q , N
FDI--------------------- 82, 72
Eruption time------- 7 MONTHS
Order----------------- 2
Shedding------------ 7-8 years

31. Mandibular lateral incisor
Similar in form to
deciduous central incisor.
Distoincisal angle is
rounded, mesioincisal
angle is sharp.
Labial/lingual aspect:
Incisal outline slopes slightly
towards the distal

32. Mandibular lateral incisor
Lingual Aspect
Cingulum and
marginal ridges little
larger.
Lingual fossa little
deeper.

33. Mandibular lateral incisor
Incisal aspect: crown
not symmetrical.
Cingulum bulges
towards distal.

34. Mandibular lateral incisor
Single root
Longer root than
central incisor
Distal curvature
apically.
Distal longitudinal
groove.

36. Maxillary canine
UNS--------------------C (rt) , H(lt)
FDI--------------------- 53, 63
Eruption time------- 19 MONTHS
Order----------------- 4
Shedding------------ 10-12 years

37. Maxillary canine
MD width > crown
height(Incisocervical measurement)
Labial or lingual views: diamond in
shape
Rounder mesial and distal outlines.
M & D outlines overhang the cervical
line.
M& D contact areas located at the
same level incisocervically.
Mesial cusp slope longer than distal
cusp slope.
No labial ridge or depressions
No imbrication lines.

38. Maxillary canine
Well developed cingulum.
Prominent marginal
ridges.
ML and DL fossae are
present
Tubercle often present on
the cingulum extending
from the cusp tip to
cingulum.

39. Maxillary canine
Mesial aspect :Triangular
in shape
Labial margin convex
incisocervically
Lingual margin concave in
incisal half and convex in
cervical half
Labiolingually tooth is
thicker
Cervical line depth less

40. Maxillary canine
Distal Aspect
Similar to mesial except
that cervical line shows
less curvature.
Incisal aspect
Rhomboidal outline
Exhibits more rounding
incisal than the permanent
canine.
Cusp tip offset to distal.
Mesial cusp ridge
therefore longer.

41. Maxillary canine
ROOT
Single root
Root approx twice the
length of crown
Wider labiolingually
than mesiodistally.

42. Mandibular canine
UNS-------------------- R ,M
FDI--------------------- 83, 73
Eruption time------- 16 MONTHS
Order----------------- 4
Shedding------------ 9-12 years

43. Mandibular canine
Smaller and slimmer
overall than the
maxillary deciduous
canine.
MD width of
mandibular primary
canine< MD width of
maxillary pri canine.
Incisocervical ht> MD
Width.

44. Mandibular canine
Distoincisal slope
longer than
mesioincisal
slope(reverse of
max.dec canine)

45. Mandibular canine
LL diameter < that of
deciduous max.
canine( much
narrower tooth
labiolingually)
Less pronounced
cingulum, MR &
cervical ridges.
Shallower fossae than
max canine.

46. Mandibular canine
Single but shorter root.

48. Maxillary deciduous molars

49. Maxillary 1st
molar
UNS-------------------- B(rt) ,I(lt)
FDI--------------------- 54, 64
Eruption time------- 14 MONTHS
Order----------------- 3
Shedding------------ 9-11 years

50. Maxillary 1st
molar
Most atypical of all primary or permanent molars
Crown doesnot resemble any other primary or permanent
molar crown.
Exhibit some similarities to the crowns of permanent
premolars

51. Maxillary 1st
molar
BUCCAL ASPECT
MD diameter greater than
crown height
Mesial and distal outlines
are convex ,constricted
towards cervix.
Comparatively straight
occlusal outlinetwo
buccal cusps not sharp or
prominent.

52. Maxillary 1st
molar
Essential difference from permanent
tooth
Depth of curvature is much greater
towards the mesial than distal.
Buccal surface smooth and lacks
grooves or depressions.
MOLAR TUBERCLE OF
ZUCKERKANDL; pronounced
bulge on mesial surface of buccal
surface.
Flat surface occlusally

53. Maxillary 1st
molar
LINGUAL ASPECT
Lingual surface shorter
mesiodistally than buccal
surface.
ML cusp quite bulky and
dominates the occlusal
outline
DL cusp is so diminitive
that DB CUSP is also
partially visible from this
aspect.

54. Maxillary 1st
molar
LINGUAL ASPECT
Cervical line is evenly
and slightly curved
towards cervix.
Convex & smooth
surface ,lacking
grooves or
depressions.

55. Maxillary 1st
molar
MESIAL ASPECT
Disparity b/w the buccolingual
widths at its cervical and
occlusal margins much more
than in max.first permanent
molars.
Wider dimension cervically
due to prominent cervical ridge
on buccal and greater taper of
buccal and lingual outlines
towards occlusal.

56. Maxillary 1st
molar
Mesial Aspect
Buccal outline dominated by
cervical ridge and crest of
curvature is in cervical
third.Remainder of buccal outline
straight.
Lingual outline convex.More
cervically located crest of
curvature than in permanent
molars
Occlusal outline MB+ ML
cusps and mesial marginal ridge
make up the occlusal outline.
ML cusp more generous in height
than MB cusp.

57. Maxillary 1st
molar
MESIAL ASPECT
Cervical line slightly
curved towards
occlusal.

58. Maxillary 1st
molar
Distal Aspect
Considerably smaller than the mesial surface.
Tapering of buccal surface towards the distal
therefore much of the buccal surface visible from
distal aspect.
DB cusp more prominent than minute DL cusp.
Distal marginal ridge less pronounced than mesial
marginal ridge.
Cervical line is straight to slightly curved
occlusally.

59. Maxillary 1st
molar
OCCLUSAL ASPECT
unusual five sided figure
Cusps: 4 cusps 1) MB cusp
2) DB cusp
3) ML cusp
4) DL cusp

60. Maxillary 1st
molar
Mesiolingual cusp
Largest cusp and
longest.
Mesiobuccal cusp
MB cusp greater than
distobuccal.
Distobuccal cusp
Distolingual cusp
Smallest cusp.

61. Maxillary 1st
molar
Transverse ridge:
prominent T-ridge
Formed by lingual
cusp ridge of MB cusp
and buccal cusp ridge
of ML cusp.
Oblique Ridge
Extends from ML cusp
to DB cusp.

62. Maxillary 1st
molar
Fossae: 3 fossae
1) central fossa
2) mesial
triangular fossa
3) distal
triangular fossa

63. Maxillary 1st
molar
ROOTS
no root trunk.
Root trunk: defined as that
portion of root situated
b/w cervical line and the
point of furcation.
Three roots: 1) MB root
2) DB ROOT
3) Palatal root
Slender and flared roots
Largest +longest palatal
root.

65. Maxillary 2nd
molar
UNS-------------------- A,J
FDI--------------------- 55, 65
Eruption time------- 24 MONTHS
Order----------------- 5
Shedding------------ 10-12 years

66. Maxillary 2nd
molar
Primary maxillary second
molar larger than primary
maxillary first molar
Closely resembles the
permanent maxillary first
molar in form but is
smaller in all dimensions.
Usually has a Cusp of
Carabelli ,as its permanent
counterpart.

68. Mandibular 1st
molar
UNS-------------------- L &S
FDI--------------------- 84, 74
Eruption time------- 12 MONTHS
Order----------------- 3
Shedding------------ 9-11 years

69. Mandibular 1st
molar
Primary mandibular first
molar has crown unlike
any tooth of either
dentition.
Prominent buccal cervical
ridge on mesial half of
buccal surface.
The HOC on the buccal is
at cervical one third
The HOC on the lingual is
in the middle one third.

70. Mandibular 1st
molar
CUSPS: 4 cusps:1)MB
2) ML
3) DB
4) DL
The two mesial cusps are
considerably larger than
distal cusps.

71. Mandibular 1st
molar
A transverse ridge
passes b/w the
mesiobuccal and
mesiolingual cusps.

72. Mandibular 1st
molar
Roots
2 roots i.e mesial and
distal .
Mesial wider than
distal root.

73. Mandibular 2nd
molar
UNS-------------------- K&T
FDI--------------------- 85, 75
Eruption time------- 20 MONTHS
Order----------------- 5
Shedding------------ 10-12 years

74. Larger than the primary
mandibular first molar.
This tooth closely
resembles the
permanent mandibular
first molar, disregarding
size and general
differences.
5 cusps similar to
permanent mand first
molar.
Mandibular 2nd
molar

75. Mandibular 2nd
molar
Major differences are: The 3
buccal cusps (MB,DB&
distal) are nearly equal in
size.
Occlusa table relatively
longer buccolingually and
less pentagonal than that of
the first permanent molar.
The mesial root is longer and
wider than the distal root
whereas they are of equal
length in permanent first
molar.

77. ANY QUESTIONS