Dental Anatomy Flashcards
Anatomical Crown
Area of tooth covered by enamel
Clinical Crown
Part of tooth above gingival margin
Clinical root
Unerupted part fo the root below the gingival crest
Anatomical root
Root below the CEJ
Enamel
Formed by ameloblasts
96% Inorganic
Thickest near crown tips and thinnest near CEJ
Dentin
Largest portion of the root and almost the entire root
70% Inorganic
Produced by odontoblasts
Continues to form after eruption (Secondary dentin)
Repairative dentin
forms in response to trauma to decrease sensitivity
Cementum
Most similar to bone
65% inorganic
Thickest at apex
Cellular at the apex and can reproduce itself
Pulp
Nerve, blood, and lymph
Source of nutrients
Pulp produce odontoblasts
Shape and size can be affected by function and age
Pulp stones
Calcified areas in the pulp
Seen on radiographs
Maxillary Central Incisors
Erupt 7-8 years old
Most prominent and widest MD of anteriors
Root cross section is round and crown is triangular
Lingual has smooth broad fossa with prominent cingulum
Maxillary Lateral Incisor
Erupt 8-9 years old
Varies more than any other tooth
Prominent lingual pit
Deep DL groove that extends to root surface
Root cross section is oval
Most common with Dens in Dente
Could be congentically missing
Maxillary Canine
Erupts 11-12 years old
Longest root in the mouth
Anchor tooth held in by canine eminance
Largest cingulum of anterior teeth
Maxillary First Premolar
Erupts 10-11 years old
2 Cusps Buccal and Lingual
Most likely to be exo’ed for ortho do less flatness
Most have two roots
Mesial surface has a longitudinal depression (concavity)
Larger than second premolar
Maxillary Second Premolar
Erupts 10-12 years old
USally has one root but could have two canals
Maxillary First Molar
Erupts at 6 years old
5 cusps (Cusp of Carabelli attahced to ML)
3 roots and palatal is the largest
Most difficult to root plane
Prominent oblique ridge
More square in shape
Maxillary Second Molar
Erupts 11-13 yearws old
All cusps smaller than first molar
Three roots
More secondary anatomy and pits on occlusal
More rhomboidal on occlusal
Maxillary Third Molar
Maxillary 17-22 years old
Varies more than any other tooth in size and shape
Smallest in width
Usually lack DL cusps
Trifucated but roots are usually fused together
Occlusal is usually heart shaped
Mandibular Central Incisor
Erupt 6-7 years old
Smallest teeth in the mouth
Bilaterally Symetrical
Only occlude with one tooth
Mandibular Lateral Incisor
Erupt 7-8 years old
Slightly more convex
Twisted more distal
Mandibular Canine
Erupt 9-10 years old
Longest root in mandibular
Smooth lingual surface
May be bifuracted at the apex
Mandibular First Premolar
Erupts 10-12 years old
Always smaller than Mandibular second premolar
Functions more like a canine
Mandibular Second Premolar
Erupts 11-12 years old
Larger than first premolar
Can have two or three cusps
Y is more common three cusp form
functions more like a molar
One root that is longer and wider than first premolar
MAndibular First Molar
Erupts 6-7 Years
5 cusps
Wider MD than BL
Largest tooth in mandibular arch
Grooves converge into central fossa
Distal root is shorter than mesial
Mandibular Second Molar
Erupts 11-13 years old
4 cusps
Roots are shorter and closer together
Mandibular Third Molar
Erupts 17-21 years old
Most varied of mandibular teeth
More oval in shape
Smallest crown of molars
Number of primary teeth
20 teeth A->T
Leeway sapce
Primary molars are wider than replacing premolars
Enamel thickness permanent vs primary
primary teeth are thinner than permanent
Root Trucks
Smaller in primary than permanent
Primary Incisors
Similar outline to permanent but no lingual pit or mamelons
Primary Maxillary Canine
sharp cusp and mesial cups ridge is longer than distal
Primary Tooth Eruption
Central Incisors 6-7 months
Lateral Incisors 8-9 months
Canines 18 months
First Molars 12 months
Second Molars 20 months
Primary Hard Tissue Formation
In utero 4-6 months
Primary Crowns Completed
1.5 - 10 months of age
Primary Roots Completed
1.5 - 3 years of age
Root Resorption of Primary Teeth
Pressure from permanent teeth
Permanent Tooth Formation
Birth to 3 years
Crowns of Permanent Teeth
4-8 years old (half the age of eruption)
Roots of Permanent Teeth
2-3 years after eruption
