Intro Flashcards
How many teeth in primary vs secondary dentition
Primary have 20 teeth
Secondary has 32 teeth
Mamelons vs perikymata on newly erupted teeth
M- three small scallops on incisal edge of anterior teeth, wear down over time
P- numerous horizontal ridges on enamel, closer together in cervical third, wear away over time
Root axis line aka
Mid-root axis line
Imaginary line through center of root
Splits tooth into facial and lingual halves
Finds the access
What occupies the interproximal space
(Aka the cervical embrasure)
The interdental papilla!!
Which two tissues are seen on a normal, in tact tooth
Enamel and cementum only
Contact areas move _____ and ______ as you move distally
They move facially and cervically
Embrasure space functions
Allow food to escape when chewing, so it does not get stuck between teeth
FDI numbering system
Rest of world uses
Secondary UR: 1- UL: 2- LL: 3- LR: 4-
Primary 5- 6- 7- 8-
The CEJ becomes ________ _________ as you move distally
CEJ becomes less pronounced
Palmer notation
Uses half square line to notate white quadrant
In the square is a number to tell which tooth from the midline
HOC in posterior teeth
Facial- cervical
Lingual- middle third
What do you call the area of a root before it bifurcates
Root trunk
Dentin develops from what and what cell makes it
Develops form the embryonic dental papilla in the mesoderm
Made by odontoblasts
Only organic part of a tooth
Pulp
Cervix=
Cervical line
What do you call the space between two roots of the same tooth
Furcal region
Which of the tooth tissues are considered calcified
Enamel, dentin, and cementum only
Pulp is living
Polyphyodont
Animals that have an endless succession of teeth throughout their life
Ex. Sharks, alligators
Homodonts
All teeth are the same
Ex. Whales
Are molars considered succedaneous teeth?
NOOOO
Bc they come in BEHIND primary dentition, they do not replace
Class of teeth vs type of teeth
Class- incisor, canine, molar etc
Type- lateral or central, first or second
Contact areas aka
Where are they located and exception
Aka proximal HOC
As you move distally, the HOC moves more cervically
EXCEPT mand 1 premolar!
CEJ curvature from the mesial/distal view?
From the facial/lingual view?
M/D: convex- the CEJ dips down towards the incisal third, less enamel on sides
F/L: concave- the CEJ runs up toward the cervical line, more enamel on front and back
What tooth tissue does HAP make up 95% of
Enamel
5% enamel matrix
Heterodonts
Different types of teeth in the mouth
Ex. People
Root to crown ratio
Length of the root relative to the crown, tellls the longevity of the tooth
A larger number = better bc there is more anchor into the bone! Longer roots, smaller crown
Where does cementum develop from and what cell makes it
Develops from the dental sac of the mesoderm
Made by cementoblasts
Anatomic vs clinical crown/root
Anatomic: DO NOT CHANGE!!!
Anatomic crown- ACTUAL crown area that is covered by enamel, may not be seen entirely during an exam
Anatomic root- ACTUAL root area that is covered by cementum
Clinical: CHANGES over patients life, relative to gum/bone levels
Clinical crown- VISIBLE crown size during exam, the entire structure of tooth that sticks out of the gums is known as the clinical crown
Clinical root- the part of the tooth that lies UNDER the gums during an exam
Diphyodont
Two sets of teeth (dentition) over their lifetime
Ex. People
Primary teeth present in children from what ages?
All primary teeth are shed by about what age?
2-6
Usually all shed by age 12/13
Universal numbering system
USA!!!
1-32
HOC of all anterior teeth for facial and lingual is in what third
Cervical third
Line angle vs point angle
The area where 2 surfaces meet
The area where 2+ line angles meet, corner
Monophyodont
Animals that only have one set of teeth their entire life, when teeth are lost they are not replaced
Ex. Whales
What is composed of 70% HAP
Dentin
18% collagen
What is pulp made of
Soft CT
Has a rich supply of BV and nerves
Cementum is ______ bone, but _____ than enamel
Cementum is about as hard as bone, but softer than enamel
Is the facial or lingual embrasure larger?
Lingual embrasure bc teeth usually narrow towards the lingual
Height of contour
What it is and function
Thicket part of the tooth from buccal or lingual aspect
Functions to push food away from the soft tissue when biting/chewing
Dentin is _____ than cementum, and _______/______ than enamel
Harder than cementum, and softer/less brittle than enamel
What part of the tooth is made of 65% HAP
Cementum
35% organic matttter, collagen fibers
Primary teeth have how many classes of teeth
3 classes
Incisors, canines, molars
No premolars
What is the hardest substance in the body
Enamel
Order of labeling line and point angles
MODBL
Where does pulp develop from
Dental papilla in the mesoderm
Where does enamel develop from and what cell makes it
Ectoderm
Ameloblasts
Each contact has how many embrasure spaces
4 embrasure spaces
Incisal/occlusal embrasure
Cervical/interproximal embrasure
Facial embrasure
Lingual embrasure
Each cusp has how many cusp ridges
4 cusp ridges= one cusp
Fissure vs pits
Fissure is at the depth of a groove
Pits are at the depth of a fossa
Apical foremen
At root tip of teeth where the dentin stops covering, there is a hole where nerves and BV enter
