Deciduous Teeth Flashcards
Active Eruption
Vertical movement of teeth
Passive Eruption
Gingiva recedes, no actual vertical movement takes place as we age
Is eruption of primary and permanent teeth into the oral cavity active eruption or passive eruption
ACTIVE
Primary teeth are lighter or darker opacity of enamel???
lighter
Pulp chambers of primary teeth are large or small compared to permanent teeth
large
Pulp horns of primary teeth are closer or farther from the occlusal plan
closer
Dentin is thinner or thicker in primary teeth
thinner
Explain exfoliation, resorption and eruption
Exfoliation: shedding or eliminating
something from the surface of the body,
as in loss of teeth from jaw bone • Primary roots are resorbed • Permanent teeth move vertically as part of
active eruption, and the primary tooth
loosens • Sometimes, the primary teeth do not
loosen and extraction is required
removal of hard tissues such as bone, enamel, dentin or cementum
Resorption
replace resorbed portions of root
cementoblasts
odontoblast
removal of the primary’s root
(dentin, cementum, and small portions of the
enamel crown)
odontoclasts
absorb alveolar bone between the
primary and permanent teeth
osteoclasts
Shedding and eruption is ____ with
osteoclasts and osteoblasts working to repair
bone as it resorbs
intermittent
**Which of the following breaks down
the bone between the primary tooth
and the permanent tooth following it?
osteoclasts
General characteristics of molars
-Second molars resemble permanent first
molars from same arch
Maxillary Central Incisors
- Wider mesiodistally than incisocervically • Mesial and distal outlines very rounded due to cervical constriction • Usually no developmental depressions or imbrication lines • Large cingulum and well developed marginal ridges
Does the mandibular central incisor or maxillary central incisor have a centered cingulum and shallow fossa
mandibular central incisor
-Wider than permanent • Very symmetrical • Prominent, centered cingulum and shallow fossa • Single root with slight concavity on mesial and distal aspects • Mamelons may be present
Mandibular Central Incisors
• Longer incisocervically than mesiodistally (opposite the central) • Incisal angles are very bulbous • Root is longer in comparison to crown length and sharper apex
Max Lateral Incisors
how can you tell apart a primary central or lateral for maxillary
Incisal angles are very bulbous on the lateral incisors
• Crown is very similar to mandibular central, but wider and longer • Cingulum is more developed and offset to distal • Incisal edge slopes distal • Distal Twist!!!!! • Distoincisal edge is more rounded • Root may have a distal curve at apical 1/3 • Fossa is deeper
Mandibular lateral incisors
How do you tell apart a mandibular vs maxillary lateral incisors primary
Mandibular lateral will have a cingulum more developed and offset to distal
- incisal edge slopes distal
- distal twist
Maxillary Canines
• Mesial cusp slope is longer than distal-opposite #6 &
#11
• Cingulum, marginal ridges and lingual ridges are well
developed
• Lingual ridge runs from cusp tip to cingulum • Tubercle may be present (accessory cusp)
• Cusp tip is offset to the distal from incisal view
• Root is about twice as long as crown
Mandibular Canines
• Labial surface is much flatter than maxillary with very shallow grooves • Distal cusp slope is much longer • Less lingual anatomy with very shallow fossa • Incisal view shows a tapering to lingual • Root is long, narrow and almost twice the length of crown
How could you tell apart a mandibular canine from a maxillary canine primary
mandibular canine will have a distal cusp slope much longer
• Typically 4 cusps, but may be missing distolingual (3) • Same root configuration as permanent, but more flare and thinner • Prominent transverse ridge
Maxillary First Molars
***• Closely resembles the permanent maxillary first molar ***• May have a tubercle of Carabelli located on the mesiolingual cusp • Crown and roots larger than primary first maxillary molar • Buccal cusps very similar in size
Maxillary Second Molars
• Prominent
mesiobuccal
cervical ridge
Belt tumor hanging over belt
- 4 cusps with mesial larger
Mandibular first molars
• Closely resembles the
permanent mandibular
first molar because
it has 5 cusps
Mandibular Second Molars
