anatomy of deciduous teeth
TRANSCRIPT
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Introduction
There is a certain amount of variation among
individual teeth. Every tooth may not meet all
the criteria for identification. By
understanding the characteristics of each
tooth, you will be able to differentiate among
teeth, as well as between the left teeth and the
right teeth in any particular group.
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Primary maxillary right central
incisor
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•
10 months
• Greater mesiodistal dimension than crown
height
• Contact points – board, extending from the
incisal one third to the gingival one third
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• Flat labial surface
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• Prominent cingulum
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• Root is conical
• Roughly two and half
times as long as the
crown height
• Mesial pulp horn is most
prominent
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• Incisal edge is
- 2.3mm from the pulp horn on the mesialaspect
- 2.4 mm from the pulp horn on the distalaspect
- the pulp horns are approximately 1.2mmfrom the dentin enamel junction
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Primary maxillary right lateral incisor
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MAXILLARY LATERAL INCISOR
• Smaller than central
• Distal incisal aspect
is rounded• More conical
• Pulp chamber – smaller
2.6 mm from the incisaledge to the pulp
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• Pulp is approximately 0.9 mm from the DEJ on
the mesial and distal aspects
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Primary mandibular right central
incisor
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• Flat when viewed from the buccal aspect
• Crown is one third
the length of the rootwith cingulum on the
lingual surface
• Root long and cylindrical
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• Pulp is approximately
- 2.6 mm from incisal edge
- 1.7mm from distal enamel surface
- 1.0mm from the mesial surface
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Primary mandibular right lateral
incisor
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• Distal incisal angle is more rounded
• Pulp has similar dimensions but
is somewhat smaller
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Primary maxillary right canine
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MAXILLARY CANINE
• Long and sharp
• Crown constricted at the
cementinoenamel junction
• marginal ridges are usually lacking
• prominent cingulum
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• long slender root is more then twice the crown
length
• Pulp horn 3.2 mm from the DEJ at the incisal edge
• On the mesial and distal
surfaces the pulp is
approximately 2.1mmfrom the DEJ
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Primary mandibular right canine
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MANDIBULAR CANINE
• Long and narrow tooth,
smaller then maxillary
canine
• Distal marginal ridge is
much
• point of contact is very
close to the cervical third
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Primary maxillary right first molar
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• Primary maxillary first molar is unique in that
it looks somewhat like a molar but also like apremolar
• Occlusal surface consists of three cusps
- mesiobuccal , distobuccal and on lingual
surface
• Square look
• Three slender roots begin in the
cementoenamel junction
• Prominent buccal cervical ridge
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• Pulp horns correspond to each cusp
• From the cusp tip
- mesiobuccal pulp horn is 1.8mm
- distobuccal pulp horn is 2.3mm
- lingual pulp horn is 2.omm
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Primary mandibular right first molar
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• it has four cusps , two buccal and two lingual
• Occusal surface is unique- Mesiobuccal and mesiolingual cusps converge
together to form a rather narrow surface
- Very prominent ridge of enamel, thetransverse ridge, that divides the occusal
surface
- Enamel of the tooth is uniformly 1.2 mm thick
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• Two board but thin mesiodistal roots, one on
the mesial aspect and one on the distal aspect
• Four pulp horns
- Buccal and lingual mesial pulp horns are
2.4mm away from the DEJ
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Primary maxillary right second molar
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• Resembles the permanent maxillary first
molar in appearance but is smaller• Four cusps , two on buccal and two on lingual
aspects
• Fifth cusp or prominence, the cusp of carabelli• Tooth is rhomboidal
• Prominent transverse or oblique ridge
connects the distolingual cusp with themesiolingual cusp
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• Three roots that are curved to accommodate
the developing tooth bud beneath
• Enamel is usually 1-2mm thick uniformly on
the tooth
• Four to five pulp horns ,prominent beneatheach cusp tip
• Mesiobuccal pulp horn, as usual , is the largest
and closest to the DEJ
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• Mesiobuccal pulp horn is usually 2.8mm from the
DEJ, while the distobuccal horn is 3.1 mm from the
DEJ
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primary mandibular right second
molar
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• Smaller permanent manibular first molar
• Five cusps , three on the buccal surface and two on
the lingual surface• Enamel is uniformly 1.2mm thick
• Two roots which are narrow mesiodistally but very
board buccolingually• Five pulp horns corresponding to the five cusps tips
- mesiobuccal pulp horn is largest, extending
2.8mm from the DEJ
- distobuccal pulp horn is 3.1mm from
the DEJ
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