Tooth Landmarks & Morphology Flashcards
List the surfaces of teeth
-Lingual (palatal for maxillary teeth)
-Facial (labial and buccal)
-Proximal (faces neighboring tooth)
-Occlusal (biting/chewing surface)
Vertical Divison of Crown Surfaces- Direct facial and lingual surfaces
-mesial third
-middle third
-distal third
Vertical Divison of Crown Surfaces- proximal surfaces
-facial third
-middle third
-lingual third
Horizontal Division of Crown Surfaces
-incisal/occlusal 3rd
-middle 3rd
-cervical 3rd
Horizontal Division of Root Surfaces
-cervical third
-middle third
-apical third
What does the root-to-crown ratio represent?
larger ratio: relatively larger root compared to crown
small ratio: nearly equal root and crown lengths
Line angles are formed at the junction of ___ surfaces
2
How are line angles named?
according to the surfaces they join with proximal name first and occlusal/incisal name last
example/ distolabial, mesiobuccal
List the ANTERIOR Teeth line angles
-labioincisal
-mesiolingual
-mesiolabial
-linguoincsial
-distolingual
-distolabial
List the POSTERIOR Teeth line angles
-mesio-occlusal
-mesiolingual
-mesiobuccal
-bucco-occlusal
-linguo-occlusal
-distolingual
-distobuccal
-disto-occlusal
Point angles are formed at the junction of ___ surfaces
3
List the point angles for ANTERIOR teeth
-mesiolabioincisal
-mesiolinguoincisal
-distolabioincisal
-distolinguoincisal
List the point angles for POSTERIOR teeth
-mesiobucco-occlusal
-distolinguo-occlusal
-distobucco-occlusal
-mesiolinguo-occlusal
Another word for fusion in dentistry is…
Coalescence
True or False: Developmental grooves remain after fusion
True; due to separate parts of the tooth being formed by lobes
How many development lobes are there for anterior teeth and most premolars?
4 lobes: 3 facial and 1 lingual
What is a cingulum
a prominence or bulge on the lingual surface of all anterior teeth
How many development lobes are for the 1st molars?
4-5
mandibular: 2 lingual 3 facial
maxillary: 2 facial 2 lingual
What is a tubercle
a small elevation of enamel on the crown
What are Cusps of Carabelli?
tubercles on the mesiopalatal line angle of maxillary 1st molars, may be considered by some as simply a cusp if its well developed
Describe mamelons
scalloped like edges on the enamel located on the incisal ridge, it is naturally worn away with normal use of teeth and therefor wear on the enamel
What are perikymata
very small wave like ripples of enamel on newly erupted adult teeth; these bumps are created due to the layer like growth of enamel
Central grooves run _____.
mesiodistally
Fossae
shallow depression or concavity
Pits
pinpoint depression often found within fossae
Three cusped premolars and most molars have three fossae, list them
-mesial
-central
-distal
Two cusped premolars have two fossae, list them
-mesial
-distal
Describe cusps
rounded mounds found on the crown. is a major division of the occlusal or incisal surface. it is the most obvious landmark on posterior teeth, and the number varies according to the tooth.
What are ridges?
linear elevated portion of a tooth that runs in a line
Canines and posterior teeth have how many cusps?
1-5
Most cusps are named after the closest _______.
tooth surface or line angle
Triangular ridges
the main ridges on each cusp that run from the tip of the cusp to the central part of the occlusal surface
Transverse Ridges
the union of two triangular ridges that cross the occlusal surface
LOOK AT THE CANVAS POWERPOINT FOR RIDGE/CUSP DIAGRAMS
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