Tooth functions and terms Flashcards
Crown covered by what
enamel
root portion is covered by what
cementum
what is anatomic crown
whole crown of the tooth is covered by enamel
what is clinical crown
the part seen above gingiva
Bifurcation
two root
Trifurcation
three root
Alveolar process
Portion of the jaw that supports the teeth
What is the 3 factors that determine the colour of enamel
Mineralization
thickness
skin pigmentation
Enamel function
resistant to wear
resistant to bacteria
resistant to mild acids
resistant to tooth decay
What densely packed enamel do
gives the crown of the tooth a self-cleaning service
Prevent food particles and bacteria adhere (粘附) to the surface of tooth crown
Dentin
Greatest bulk of the tooth because it forms the largest portion of the crown and root
yellowish and elastic
capable of adding to itself
Secondary dentin
Form throughout the pulp chamber after tooth eruption
In time, it completely fill the pulp chamber
Reparative dentin
Located at the dentin, reaction to dental caries or trauma
Function of cementum
Provide a medium for the attachment of the tooth to alveolar bone
What is cementum
Bonelike substance that covers the root
Union of cementum and dentin is called
Dentino- cemental junction
What is the two types of cementum
Cellular cementum
Acellular cementum
Pulp function
Nourishing （滋养）
sensory
Dentin-reparative system of tooth
Incisors function
Cut
Canines function
holding or grasping the teeth
protect the jaw joint during side jaw movement
Premolars function
Help in grind
Molars function
chew or grind up food
What molars cusps do
interlock the upper and lower molars
What is lingual surface
Tooth that faces the tongue
labial surface
Anterior tooth that facing the lip
Buccal surface
Posterior tooth that facing the cheek
Proximal surface
surface of a tooth faces the neighboring tooth’s surface in the same arch
What is the two proximal surface
mesial
distal
Mesial proximal surface
Closest to midline of the face
Distal proximal surface
Faces away from the midline
Fifth surface of posterior teeth
occlusal surface / biting surface of the tooth
What is Lobes
Developed 4 or more growth centers when crowns are formed
Developmental grooves
shallow grooves or lines that separate primary parts of crown or root
Transverse ridge
union of 2 triangular ridges, buccal and lingual that cross the occlusal surface of a posterior tooth
Lingual groove
Developmental line that separates fourth lobe of anterior tooth from the labial lobes
Fourth lobe of the anterior teeth is what?
cingulum
tubercle
small elevation on tooth
cusps
mountain on crown portion of the tooth
makes up a major division of its occlusal or incisal surface
cusps only found at?
pre molar
molar
canines
Fossa
an area on the tooth that is concave
Pit
depression on fossa or anywhere on the tooth, but usually occur along the developmental groove or in fossa
ridge
elevated portion of a tooth that runs in a line
Marginal ridges
rounded borders of enamel that form at the mesial and distal shoulders
Alveolus
bony socket in which the tooth fits in
The crown and root are joined at the？
Cemento-enamel junction
