DENT 1512-incisors MOSTLY MN
the distal cervical line curves how much for MN LI?
2 mm [less than MN CI]
what is the greatest extent of curvature of the cervical line for any tooth in MN arch
3 mm toward incisal ridge--cervical line curvature
how far does cervical line curve toward incisal ridge for MN CI?
3 mm--same as MN LI
are there depressions on maxillary incisors?
NO
where is facial height of contour for MN LI?
cervical 1/3 just incisal to the cervical line
how is MN LI root shaped?
cone; convex on labial surface
describe crown concavity on for distal/mesial for MN LI:
deeper crown concavity on the distal than the mesial
from an incisal view describe the shape of the crown of mandibular incisors
diamond
what point angle is closer to mdidle of cingulum--MI or DI--for MN LI?
distal incisal
the root of the mandibular incisors is what shape?
hour-glass shaped (wide labiolingually with mesial and distal root depressions)
the lingual outline of the MN CI crown is similar to what
the mesial outline
how does distal aspect of MN CI compare to mesial view
very similar
describe cervical line curvature for MN LI:
curves ~3 mm toward incisal ridge
which direction does the root curve for MN LI?
either distal or mesial
The area of greatest convexity on the mesial and distal surface has been located in what part of the tooth (for mandibular incisors)
incisal one-third almost level with incisal edge
describe lingual aspect of the crown for MN LI.
series of shallow subtle convexities [mesial marginal ridge, distal marginal ridge, cingulum, lingual aspect of incisal ridge] and a concavity
are there depressions on mandibular incisors
yes
is the cingulum prominent in the lingual outline of MN LI crown view?
yes
what separates the 3 lobes on labial surface of MN LI?
2 developmental depressions
how much does distal cervical line curve for MN CI?
2 mm [same as MN LI]
what is visible on labial surface of MN LI?
3 subtle convexities that demarcate the 3 labial lobes
overall root length compared to crown for MN LI?
3.8 mm longer than crown length
from incisal view what is shape of MN LI?
4 point diamond
facial development depressions on MN LI were found on what percentage of lateral incisors?
51%
what/where is the greatest extent of curvature of the cervical line for any tooth in the mandibular arch?
MN CI; 3 mm toward incisal ridge
The mandibular contact areas differ from the maxillary contact areas of the respective central incisors because
The mandibular central incisor's mesial and distal contact areas are the same height
incisors fcn as what
a group in mastication, esthetics and phonetics function in biting and incising as a team.
what does a trapezoidal facial view do for anterior teeth?
allows for long interdental papilla, better aesthetic result
where does root taper occur for MN CI?
apical 1/2 of root
the mandibular central/lateral icnisor bisects the tooth where and where is the incisal edge?
bisect tooth in 1/2 (labiolingually) incisal edge is on lingual side
the mesial of what tooth has greatest curvature of the cervical line and what is the dimension?
central maxillary incisor 3.5 mm
where are the facial/lingual height of contour for the mandibular central/lateral incisors?
cervical one-third just incisal to the cervical line
where are the anterior heights of contour for ALL anterior teeth?
cervical third
MN LI looks rotated o axis, how does this affect cingulum?
cingulum shifted toward distal
on a FL look, the distal icnisal edge of MN LI is closer to what and why?
closer to cingulum bc it slopes cervically
a cross-section of the root of the maxillary incisors is what shape
conical or triangular
describe the dsital surface of the crown of MN LI.
convex
describe the emsial surface of MN LI crown.
convex
describe mesial surface of MN LI crown
convex near height of contour; rest is flat
describe facial outline of crown
crown is evenly convex in this view at the heights of contour
describe the distal surface of the mandibular incisor crown
crown surface is generally convex
compared to MN CI, what exists on the lateral incisor more?
distal bulge/convexity
all distal depressions relate how to the mesial depressions?
distal depressions are deeper than mesial
The area of greatest convexity on distal surface is located how compared to mesial surface of MN LI
distal surface located more cervical; but still in incisal 1/3
how does the MN LI crown tilt on its root?
distally
central incisors have equal what? this indicates what?
equal contact areas, same level incisal gingivally
describe the mesial surfaces of the mandibular incisor crown
generally convex
describe the permanent MN CI relationship between crown length and crown width
greater crown length [cervical incisal] than crown width [mesiodistally]
how does MN LI root taper?
greater taper in apical 1/2
what is the distal ehight of contour for MN LI?
incisal third of crown but more cervical than mesial height of contour
the lingual height of contour for MN LI is where?
incisal to cervical line
the incisal ridge in maxillary incisors is centred
labiolingually
the crowns of the mandibular incisors are wider ____ than ____
labiolingually than mesiodistally
from incisal view how does mN LI taper?
lingual
the mandibular incisor crown tapers in what direction
lingual
mandibular incisors have the incisal ridge
lingual to a line bisecting the root
lingual aspect of incisal ridge [MN LI] aka:
linguo-incisal ridge
MN LI have a distal proximal contact located how in relation to the mesial proximal contact
located further cervically
where is the convex labial height of contour for MN LI?
located in cervical third of the crown
what tooth has the mesial and distal heights of contour or contact areas (for an ideal alignment of the dentition) are at the same level (mesio-incisal and disto-incisal corners)
mandibular central icnisor
what tooth has the smallest permanent dimensions of all teeth/
mandibular central incisor
what tooth is virtually bilaterally symmetrical from the facial and lingual views
mandibular central incisor
in the maxillary arch, the maxillary central incisor is larger than the maxillary lateral incisor...what is true for the mandibular arch?
mandibular central incisor is smaller than mandibular lateral incisor
what tooth has same height incisal/gingivally
mandibular central/incisor
what teeth has the smallest mesial contact width?
mandibular incisors
which is wider...lateral or central mandibular incisor?
mandibular lateral [OPPOSITE OF MAXILLARY]
who has a wider mesiodistal area...max central or lateral
max central
what tooth has a have a deeper, more well-defined lingual fossa
max central incisor
the incisor cingula is more prominent in what arch?
maxillary
the lingual outline of the crown of MN LI is similar to what outline?
mesial outline
where are the mandibular incisors narrowest?
mesio-distally of all of the permanent teeth.
what is the mesial height of contour [contact area] for MN LI?
mesio-incisal corner of the crown
maxillary central and alteral incisors are wider what way compared to the mandibular coutnerparts?
mesiodistally
the crowns of the maxillary incisors are wider ____ than ____
mesiodistally than labiolingually
where is MN CI crown generally convex?
near crest of curvature (mesial surface)
describe the MN CI incisal ridge
normally lingual to a bisecting line of the root (arch trait)
the incisal ride is normally lingual to what for MN LI?
normally lingual to a bisecting root [arch trait]
what is the canine referred to as?
pentagonal
how is the apex of root for MN LI?
slightly blunt
describe mesial outline of MN LI
slightly convex
describe the distal outline of the MN LI crown
slightly convex
5.3 8.8 12.6 [F/L: 5.7]
state the dimensions
describe the lingual surface of MN LI with respect to groves, ridges pits
surface is smooth; NO GROOVES, NO RIDGE,S NO PITS
key characteristic of central mandibular incisor:
symmetry
describe the lingual outline of the crown of the mandibular incisors
the cingulum is prominent in this view
describe the facial outline of the mandicular incisors crown
the crown is evenly convex in this view at the height of contour
for MN LI how does the tooth look on its axis
tilted distally; incisal edge goes more desial to distal bc there is arch form
bolton ratio
total distance of arch; if I straighten all teeth in an arch they may or may not be able to all fit in there together how much room we have in between all the teeth compared to in between all the maxillary?
from the lingual view where does the crown and root taper?
toward lingual
from a facial view, what is the shape of ALL anterior teeth?
trapezoidal
outline form of the crown of the mandibular central incisor is what shape?
trapezoidal
describe the crown shape for MN LI at distal view
triangular
from a mesial view describe the shape of the crown of mandibular incisors
triangular
from mesial view what is shape of MN LI?
triangular
what is shape of MN CI crown from distal view?
triangular
what is the MN CI root shape?
triangular
describe shape of root of MN LI
triangular; root tapers in apical 1/2