tooth morphology Flashcards
how many teeth are in the Primary Dentition
20 teeth, 5 in each quadrant
how many teeth are in the secondary dentition
32 teeth, 8 in each quadrant
cusp
The pointed or rounded part of a tooth’s biting surface.
Marginal ridges
A linear, rounded border of enamel that forms the mesial and distal margins of anterior teeth. • Mesial and distal borders of occlusal surfaces on posterior teeth.
cingulum
• A “U”- or “W” -shaped ridge at the base
of the palatal surface of the crown of the
upper incisors and canine teeth
pit
a small indentation in the crown of the
tooth
fissures
A deep furrow, cleft, or groove. • A normal groove or furrow on the surface of a tooth, that may divide it into different parts. • A developmental break or fault in the enamel of a tooth
groove
• any furrow or channel on a bodily
structure or part
cervical margin
The slightly constricted part of a tooth,
between the crown and the root.
• The point at which enamel meets
cementum.
What “tip” will help you identify
left from right?
Mesio incisal angle is
sharp
• Disto incisal angle is
rounded (upper left)
Smallest tooth in the primary dentition
lower central primary incisors
Upper surface called…
Lower surface called…
palatal
lingual
Upper first primary molar
Three roots-two buccal and one palatal
Pronounced bulge on mesial side of buccal surface-molar tubercle of Zuckerkandl
lower first primary molar
Molar tubercle of Zuckerkandl present on buccal
surface over the mesial root
• Four cusps- buccal cusps compressed
labiolingually with no clear separation between
them
• Mesiobuccal cusp largest
• Tooth is longer mesiodistally than labiolingually
• Two roots flattened mesiodistally
lower second
primary molar
- Occlusal outline rectangular
- Five cusps-3 buccal 2 lingual
- Buccal cusps approx. equal in size
- Two divergent roots
upper central secondary
incisors (5)
- Single root
- Shape of crown
- Large palatal cingulum
- Cingulum pit
- Marginal ridges on concave palatal surface
upper lateral secondary incisors
- Similar to central incisor but crown is smaller
- Single root
- Incisal edge
- small palatal cingulum
- More concave than central incisor
- A pit may be present-foramen caecum incisivum
- Marginal ridges
lower central secondary incisors
Smallest tooth in the secondary dentition
• Smooth featureless lingual surface
• Cingulum less developed - marginal ridge less prominent
• The root surface has a distinct groove along the length
upper secondary canine?
Single root - longest rooted tooth
• Conical crown with pronounced cervical
bulge and pointed cusp
• Distal slope longer than mesial slope
• Cingulum on palatal surface
upper first premolar
Two roots
• Two cusps
• Canine fossa on the mesial surface
• Fissure shape on the occlusal surface
lower premolar
One root
• Occlusal surface- two cusps, two fossae
secondary molar?
Three roots
• Occlusal surface- four
cusps
• Cusp of Carabelli
