Premolars Flashcards
(104 cards)
Premolar Development
____ developmental lobes, most times
one exception: ______
four
mandibular second premolard
Maxillary Premolar Development
! 1st and 2nd: There are ______ developmental lobes
! There are ______ facial developmental lobes.
! The middle facial lobe forms the ______ tip
! The palatal developmental lobe forms the ______ cusp.
four
three
buccal cusp
lingual or palatal
Occlusal View
! ______: Linear elevation on the surface of the tooth
# Marginal Ridge: Extend ______; are the mesial and distal borders of the occlusal surface
# Cusp Ridges: Extend from the ______
$ M-D: Form the ______ and ______ borders of the occlusal surface
$ B-L: Form the ______ on the occlusal surface –______ and ______
ridge B-L cusp tip buccal lingual internal ridges triangular ridges transverse ridges
______: Linear intersection of developing lobes
! ______: A rounded or angular depression found on the surface of a
tooth
! ______: A defect found in the developmental groove
! ______: A defect found in the fossa
developmental grooves
fossa
fissure
pit
Occlusal View
! Cusp Ridges:
B-L:
• ______ • ______
triangular ridges
transverse ridges
Maxillary First Premolar
Eruption: _____
10-11 years
Maxillary First Premolar
The _____ crown dimension is greater than the mesiodistal crown dimension
! NOTE: this is true for _____ premolars
occlusocervical
all
UNIQUE CHARACTERISTICS Maxillary First Premolar–Buccal View
! The outline form of the crown has been described as:
# _____
# shaped like a _____
# _____ in the occlusal half of the crown
trapezoidal
pentagon
ovoid
UNIQUE CHARACTERISTICS Maxillary First Premolar–Buccal View
! ***The mesial cusp ridge of the buccal cusp is _____ than the distal cusp ridge and may be concave or notched
! The distal cusp ridge more _____ than the mesial cusp ridge
! The buccal cusp is long and pointed
longer
convex
UNIQUE CHARACTERISTICS Maxillary First Premolar–Buccal View
! The mesial contact is located in the _____ third; near the junction of the occlusal and middle thirds
! mesial surface of the crown below/(cervical) to the contact area is concave
middle
UNIQUE CHARACTERISTICS Maxillary First Premolar–Buccal View
! The distal contact is located in the _____ third; more _____ than the mesial contact
! The distal proximal surface contact area is _____
middle
cervical
convex
UNIQUE CHARACTERISTICS Maxillary First Premolar–BuccalView
! There is a well-developed _____
! Mesial and distal buccal developmental depressions are sometimes present
facial (buccal) ridge (middle lobe)
UNIQUE CHARACTERISTICS Maxillary First Premolar–Buccal View
! Most maxillary first premolars have _____ roots
! The buccal root has a frequent _____ curve near the apex
two
distal
UNIQUE CHARACTERISTICS Maxillary First Premolar – Occlusal View
! The occlusal view is described as _____
hexagonal
UNIQUE CHARACTERISTICS Maxillary First Premolar – Occlusal View
! The occlusal table is made up of the _____ marginal ridges and _____ M-D cusp ridges
two
four
UNIQUE CHARACTERISTICS Maxillary First Premolar – Occlusal View
! The B-L dimension is _____ than the M-D dimension
! The M-D of the buccal portion of the crown is _____
# Tooth tapers to the _____
greater
wider
lingual
UNIQUE CHARACTERISTICS
Maxillary First Premolar –
Occlusal View
! The mesial contact is located just buccal to the _____ of the crown
! The distal contact is also located _____ to the buccolingual center of the crown.
**more _____ than the mesial contact
buccolingual center
buccal
buccal
UNIQUE CHARACTERISTICS Maxillary First Premolar – Occlusal View ! Buccal triangular ridge # \_\_\_\_\_ ! Lingual triangular ridge # seldom \_\_\_\_\_ # \_\_\_\_\_ surface ! The buccal and lingual triangular ridges meet forming a \_\_\_\_\_
prominent
prominent
flatter
transverse ridge
UNIQUE CHARACTERISTICS Maxillary First Premolar – Occlusal View
! There are _____ depressions in the mesial and distal of the central fossa groove
# _____ and _____ fossae
two
mesial
distal
UNIQUE CHARACTERISTICS Maxillary First Premolar – Occlusal View
! There is a major distinguishing feature:
# Mesial extension of the _____
# _____ Groove
central fossa groove
mesial marginal ridge
UNIQUE CHARACTERISTICS Maxillary First Premolar–Mesial View
! The Mesial Marginal Ridge Groove is _____
# ***MMRG distinguishes this premolar from _____
visible
all others
UNIQUE CHARACTERISTICS Maxillary First Premolar–Mesial View
! The buccolingual crown dimension is _____ than the occlusocervical crown dimension
greater
UNIQUE CHARACTERISTICS Maxillary First Premolar–Mesial View
! The outline form of the crown has been described as _____
! The occlusal table is centered over the _____ trunk
trapezoidal
root
UNIQUE CHARACTERISTICS Maxillary First Premolar–Mesial View
! The lingual cusp is _____ and more _____ than the buccal cusp
! The buccal cusp is about _____ longer than the lingual cusp
shorter
blunt
1 mm