632-641 Flashcards
Homodont dentition:
All teeth have the same morphology
Heterodont dentition:
Teeth have different morphology (eg, humans).
Monophyodont dentition:
■
One set of teeth.
Diphyodont dentition:
Two sets of teeth (eg, humans).
Polyphyodont dentition:
Multiple sets of teeth.
Anterior teeth: Incisors and canines.
■ Posterior teeth: Premolars and molars.
12 total (6 per arch).
20 total (10 per arch).
Anatomic crown:
The portion of the tooth that extends from the cementoenamel
junction (CEJ) to the incisal edge or occlusal surface (enamelcovered
portion of the tooth).
Clinical crown:
The portion of the tooth that extends incisally or occlusally
from the gingival margin (clinically visible portion of the tooth).
Occlusal table:
The occlusal surface within the cusp and marginal ridges
The primary center of enamel formation in a tooth.
Lobe:
In fully formedteeth, lobes are represented by
cusps, mamelons, and cingula, and are separated
by developmental depressions (anterior teeth) or developmental
grooves (posterior teeth).
Mamelon:
A round extension of enamel on the incisal edge of all incisors.
(See Figure 24–1.) There are usually three mamelons per .
incisor (one for
each facial lobe). They are often translucent because of a lack of underlying
dentin.
Mamelons are typically worn down by
attrition and mastication;
thus, their presence in adults is an indication of malocclusion
Cingulum:
A bulbous convexity of enamel located on the cervical third of
the lingual surface of all anterior teeth.
Cusp:
A large elevation of enamel located on the occlusal surface of all
posterior teeth and the incisal edge of canines.
Tubercle:
An extra formation of enamel on the crown of a tooth. Often
manifests as a supernumerary cusp, such as the cusp of Carabelli.
https://drive.google.com/open?id=0B8uJUY-tie8GelVKcVI0TE1LLVU
https://drive.google.com/open?id=0B8uJUY-tie8GYTdLLUdGNlJ3dWc
Ridge: ■
A linear elevation on the enamel surface.
Marginal ridge:
A ridge on all teeth that forms the mesial and distal margins
of posterior occlusal surfaces and anterior lingual surfaces
https://drive.google.com/open?id=0B8uJUY-tie8GaE9idGphMXl6c3c
https://drive.google.com/open?id=0B8uJUY-tie8GVWx1M0lBcmhVMGc
a ridge only on canines that runs incisocervically in the center
of the facial crown surface. More prominent in maxillary canines.
labial ridge
A ridge only on premolars that runs occlusocervically
in the center of the buccal crown surface. More prominent in first
premolars.
Buccal (cusp) ridge:
A ridge on all primary teeth and permanent molars that
runs mesiodistally in the cervical third of the buccal surface of the crown.
Cervical ridge:
ridge on all maxillary molars that extends from the ML
to DB cusps (it separates the MB and DL cusps).
Oblique ridge:
A ridge on all posterior teeth that extends from the cusp
tip to the central groove. The ML cusp of all maxillary molars has two triangular
ridges.
Triangular ridge:
A ridge on most posterior teeth that runs buccolingually
and connects opposing buccal and lingual triangular ridges. Most common
on maxillary premolars and mandibular molars.
Transverse ridge:
V-shaped depression on the occlusal surface of posterior teeth
between ridges and cusps.
Sulcus:
irregularly shaped depression in the enamel surface.
Fossa:
: A well-defined, shallow, linear depression in
enamel that separates the cusps, lobes, and marginal ridges of a tooth.
Developmental groove
A narrow crevice at the deepest portion of the developmental
groove in enamel.
Fissure:
: A small pinpoint concavity at the termination or junction of developmental
grooves
Pit
: An irregularly defined, short groove auxiliary to a
developmental groove that does not separate major tooth parts.
Supplemental groove
Line angle:■
An angle formed by the junction of two surfaces.
