Dental Anatomy M2

Complete adult dentition

32 teeth total - 8 incisors, 4 canines, 8 premolars, and 12 molars

Anterior teeth

8 incisors + 4 canines = 12 teeth have labial, lingual, mesial, and
distal surfaces

Posterior teeth

8 premolars + 12 molars = 20 teeth have buccal, lingual, mesial, and
distal surfaces

____ teeth have facial, lingual, mesial, and distal surfaces

all

facial or labial surface is the surface that faces the lips

anterior teeth

facial or buccal surface is the surface that faces the cheeks

posterior teeth

______ (incisors & canines) have an incisal edge

anterior teeth

____ (premolars & molars) have an occlusal surface

posterior teeth

When viewed from the proximal, ___ ____ ___ (widest area) on the facial surface of all teeth is in the cervical third (closest to the gumline)

height of contour

____ are made from 3 labial/facial lobes and 1 lingual lobe (forms
the cingulum)

anterior teeth

_____ premolars are made from 3 buccal/facial lobes and 1 lingual lobe for each
lingual cusp; molars are formed from 1 lobe for each cusp

posterior teeth

rounded protuberances on the incisal surface of newly erupted teeth (lobes)

mamelons

forms the mesial and distal borders on the lingual surface posterior teeth
- forms the mesial and distal borders on the occlusal surface

marginal ridges

____ runs from the cusp tip toward the center of the occlusal surface of the tooth

triangular ridge

___ formed by two triangular ridges (like a skateboard ramp)

transverse ridge

only found on maxillary molars

oblique ridge

what is unique about manibular central incisors?

Its crown is almost symmetrical.

All have a mesial contact that is more toward the incisal edge and a distal contact that is more cervical (toward the CEJ) EXCEPT the

mandibular central incisor

_____ ____ ____ has the lowest crown to root ratio

maxillary central incisor

From the proximal view, the facial height of contour (widest area) of ALL teeth is in the ____ ____

cervical third

The tooth with the shortest crown to root ratio (root and crown closest to the same length) is the

maxillary central incisor

Anterior teeth have an _____ ____ and posterior teeth have an _____ _____.

incisal edge and occlusal surface

NIQUE: deep, shovel shaped lingual fossa with pit, most likely to
be peg-shaped and have a deep root groove on the lingual side of the root

maxillary lateral incisors

___ ____ have more prominent lingual anatomy - deeper and wider fossa, marginal ridges

maxillary incisors

taper toward apex (cone shaped), longer than crown, tilt toward the distal

incisor roots

labial/facial shape rectangular; proximal shape triangular

incisor crown shape

curves more on the mesial than on the distal

CEJ

most symmetrical tooth

Mandibular central incisors

LARGER than the mandibular central incisor

mandibular lateral incisor

maxillary 2nd premolar eruption years

approx 10 years

how many lobes do canines develop from

what age does the permmanent maxillar canine erupt

approx. 11-12 years

true or false
permmanent mandibular cannines erupt at approx 9-10 years

true

what shape is the canine crown when viewed from the proximal view

triangular (wedge)

which characteristics can be used to distinguish the mandibular canine from the maxillary canine

a mandibular canine has a less prominent cingulum, mesial side of a mandibular canine crown and root is relatively straight, the maxillary cusp tip is sharper then the mandibular cusp tip (all of the above)

which canine has a sharper cusp tip

maxillary canine

when viewed from the facial, the maxillary canine crown shape is

pentagon

on a mandibular canine, which ridge is nearly horizontal

mesial cusp ridge

which canine is the longest tooth in the mouth

maxillary canine

true or false canine teeth are larger mesiodistally than they are labiolingually

false

which cusp ridge is longer on a mandibular canine

distal cusp ridge

when viewed from the labial/facial what is the geometric shape of a canine crown

pentagon

true or false
the maxillary canine has a prominent lingual ridge from the cusp tip to the cingulum

true

true or false
the prominent lingual ridge on the mandibular canine divides the lingual into two shallow fossae

false

like all teeth, the facial height of contour on a canine tooth is the ___ third

cervical

on occasion, which canine root can be divided into labial and lingual roots?

mandibular canine

true or false
the distal side of a mandibular canine crown and root is relatively straight

false

true or false
a mandibular canine has less prominent cingulum

true

a transverse ridge is made up of

two triangular ridges

which premolar can have a U, Y, or H groove pattern

mandiular 2nd pre-molar

maxillary first premolar eruption years

10-11

how many developmental lobes are in a maxillary first premolar

4- 3 buccal and 1 lingual

true or false
maxillary premolars look more alike than mandibular premolars

true

which tooth is this

maxillary right 1st premolar

which premolar is typically bifurcated

maxillary first premolar

true or false
mandibular 2nd premolar is smaller than the mandibular 1st premolar

false

what is shown in the diagram (line on it)

central groove

What teeth do premolars replace?

primary molars

what are the two root branches of the maxillary 1st premolars

buccal and lingual

what part of the mandibular first premolar is referred to as nonfunctioning

lingual cusp

a Y-shaped occlusal groove pattern is characteristic of a

mandibular second premolar - three cusp type

how many cusps foes mandibular 2nd premolars have

2-3

what is a clinical significance for maxillary 1st premolars

mesial root concavity- must watch for periodontitis

a rule for mandibular first premolars

lingual cusps are quite smaller than buccal cusp

what tooth is the only tooth to have mesial cusp slope longer than distal

maxillary 1st premolar

true or false
premolars have smaller crowns than anterior teeth

true

a lingual groove extending from the central pit seperating the two lingual cusps is on which tooth

mandibular second premolar (3 cusp type)

what is a transverse ridge

two triangular ridges put together

supplemental groove extend from the

central groove

if a mandibular second premolar has three cusps what are they called

mesiolingual, buccal, and distolingual

mandibular 1st premolars erupt at what age

10-12

mandibular 2nd premolars erupt at what age

11-12 years

true or false
maxillary 2nd premolars have shallow depressions on the mesial root surface

true

true or false
maxillary 1st premolars are larger than maxillary 2nd premolars

true

which premolar has a pronounced concavity (fossa) on the cervical part of mesial surface of the crown

maxillary first premolar

mesial marginal groove is extended into middle third of crown of which tooth

maxillary 1st premolar

distinguishing features of a mandibular 1st premolar

looks similar to a mandibular canine, non-functioning lingual cusp, lingual tilt of crown

what is the outdated term for premolars

bicuspids

how mant roots do maxillary 1st premolars have

when do maxillary 2nd premolars erupt

10 years

when compared to other premolars, what characteristic is unique to a mandibular first premolar

there is a mesiolingual groove crossing onto the mesiolingual surface

on mandibular 1st premolars, the mesiobuccal cusp ridge is ___ than the distobuccal cusp ridge

shorter

which lingual cusp of mandibular 2nd premolars is the largest

true or false
a maxillary first premolar can have one or two lingual cusps

false

how many lobes are present in maxillary 1st premolars

1 lingual, 3 facial

maxillary 2nd premolars develop from lobes and have roots

4 and 1

which tooth is most likely to have a large buccal cusp and a much smaller non-functional lingual cusp

mandibular first premolar