Dental Anatomy Ch16 Flashcards
permanent anterior teeth include
incisors and canines
four developmental lobes
labial lobes: mesiolabial, middle labial, and distolabial
lingual lobe
two vertical labial________outline the separations among the labial developmental lobes
developmental depressions
each one replaces the primary tooth of the same type
succedaneous
from labial and lingual, the crown outline is
trapezoidal, or four sided
when viewed from the proximal the crown outline is
triangular
crest of curvature
height of contour
rounded raised boarders on mesial and distal parts of lingual surface of anteriors
marginal ridges
raised and rounded area on the cervical third of lingual surface on anteriors
cingulum
shallow, wide depressions on lingual surface
fossa or fossae
pits on lingual surface of anteriors
developmental pits
primary groove that marks junction among developmental lobes on lingual surface of anteriors
developmental groove
secondary groove on lingual surface of anteriors
supplemental groove
patients may have difficulty in maintianing homecare of anteriors because of their
dental arch
dental arch position
may allow lips to overhang the teeth. patients can clean only incisal two-thirds of crown
grooves on the lingual surface of anteriors may present
areas for dental biofilm retention
rounded enamel extensions on the incisal ridge from the labial or lingual views
mamelons
incisors are only permanaent teeth with two_______formed from the incisal ridge or incisal edge of each proximal surface
incisal angals
a linear elevation on the masticatory or incisal surface when newly erupted
incisal ridge
wearing away of a tooth surface caused by tooth-to-tooth contact
attrition
disturbance leaves the tooth with a deep lingual pit resulting from invagination of the enamel organ into the dental papilla. may lead to pupal exposure. may be hereditary. most common w/ maxillary lateral incisor
dens in dente
pregnant woman w/ syphilis can cause baby to have localized enamel hypoplasia during tooth development
hutchinson’s incisors
maxillary central incisor
8 & 9
maxillary central incisor crown featurs
widest crown MD greatest CEJ curve & height of contour distal offset cingulum shallow lingual fossa marginal ridges
incisors height of contor
cervical third
incisors mesial contact
incisal third
maxillary central incisors distal contact
junction of incisal and middle thirds
distinguishing right from left on incisors
sharper MI angle, rounder DI angle, more pronounced mesial CEJ curvature
incisors root featurs
single rooted
maxillary insisor root features
conical shape, no proximal root concavities, rounded apex, triangular in cross section
maxillary lateral incisor
7 & 10
maxillary lateral incisor crown features
greatest crown variation, like a smaller maxillary central, prominent lingual surface, centered cingulum, pronounced marginal ridges
maxillary lateral incisors distal contact
middle third or junction with incisal third
mandibular central incisor
24 & 25
mandibular central incisor crown features
smallest and simplest tooth, bilaterally symmetrical, small centered cingulum, subtle lingual fossa, and equal subtle marginal ridges
mandibular incisor distal contact
incisal third
mandibular incisor root features
bow shaped on cross section, root longer than crown, proximal root concavities give double rooted appearance, root curves distally w/ sharp apex, oval in cross section, same or longer than central but thinner
mandibular lateral incisor
23 & 26
mandibular lateral incisor crown features
like larger mandibular central, not bilaterally symmetrical; appears twisted distally, small, distally placed cingulum, lingual fossa and moderate mesial marginal ridge longer than distal
permanent maxillary central incisors erupt
between 7 to 8 years of age. usually erupt after mandibular central incisors
why are maxillary central incisors the most prominent teeth in permanent dentition
because of their large tooth size and their anterior arch position
how many root canals in maxillary central incisors
one root canal which is rather large
pulp chamber of maxillary central incisors has
three sharp elongations, mesial, distal, and central pulp horns.
pulp horns correspond to the
three labial developmental lobes of the tooth
complete displacement of the tooth from the socket
avulsion
open contact can exist between the maxillary central incisors
diastema
supernumerary tooth between two permanent maxillary incisors. caused by abnormal initiation stage
mesiodens
permanent maxillary lateral incisors erupt between
8 to 9 years of age. normally erupt after maxillary central incisors
abnormally small teeth. maxillary lateral incisor most common
microdontia
instrumentation may be more difficult in area of mandibular incisors because
many patients have overlapping owing to inadequate mandibular arch size
developmental disturbances rarely noted in mandibular incisors but one exception
accessory root or bifurcated root
two branches having labial and lingual orientations
accessory root or bifurcated root
permanent mandibular lateral incisors erupt
between 7 and 8. erupt after mandibular central incisors
mandibular lateral incisors root completion
age 10
mandibular central incisors root completion
age 9
lateral incisor crown that is smaller from partial microdontia
peg lateral
permanent maxillary lateral incisors root completion
age 11
grooves evident on teeth associated with the lines of retzius in enamel
perikymata
slight ridges that extend mesiodistally in cervical third associated with lines of retzius in enamel
imbrication lines
patterns formed from pits and grooves on lingual surface of anteriors or occlusal surface of pernament posterieors
pit and groove patterns
