max incisor Flashcards
All Incisors are formed by—-developmental lobes
—– on facial, —- on lingual
All Incisors are formed by four developmental lobes three on facial, one on lingual
Most dominant tooth of “smile zone”
Maxillary Central Incisor
Single central incisor most challenging to restore esthetically
Maxillary Central Incisor
tf max. central incisor facial surface
Crown is slightly longer incisogingivally than mesiodistally
T
tf max central inc facial surface; Root is conical and straight; may incline mesially
F
distally
Correct the following; max central incisor–>
Mesial outline relatively round with contact at incisal 2/3 • Distal outline straight with contact at junction of incisal and middle thirds
Mesial outline relatively straight with contact at incisal 1/3 • Distal outline more rounded with contact at junction of incisal and middle thirds
max. central incisor–>Incisal edge straight with —- mamelons;
mesio-incisal angle —–, distoincisal angle more ——-
Incisal edge straight with 3 mamelons;
mesio-incisal angle sharp, distoincisal angle more rounded
correct the following;
Maxillary central incisor
Two deep developmental depressions between the 4 facial lobes
Two shallow developmental depressions between the three facial lobes
TF Lingual aspect of max. central incisor is narrower than facial aspect mesiodistally
T
Cingulum (bulky convexity at cervical 1/3 of lingual aspect) formed by lingual developmental lobe
on lingual aspect of max central incisor
TF max central incisor;
the central portion of the cingulum is typically located mesial to the center on the crown
F distal
lingual fossa is created by 3 ridges in the max central incisor
F
4–> cingulum, mesial, distal, incisor
TF lingual fossa of max central inc. May have developmental grooves in fossa and lingual pit
T
Crown roughly triangular or wedge shaped
max central incisor(mesial)
tf
max central inc –> Incisal tip and root apex lingual to bisecting line
Incisal tip and root apex on bisecting line
mesial aspect of max central incisor
CEJ line curves greatly toward —-
CEJ line curves greatly toward incisal (
tf incisal ridges are visible from mesial surface of max central inc.
T
which is false about max central incisors from distal surface?
Shorter incisocervically than mesial
CEJ line more pronounced than mesial
Contact area more cervically positioned than mesial
B
CEJ line less pronounced than mesial
Max central incisor
tf
Due to the turn of the tooth along the arch, you see more of the facial surface of the crown from the distal view. Also, the mesial marginal ridge is not visible from this view
t
incisal of max central incisor
Roughly triangular outline
wider mesiodistally than faciolingually
max central inc (incisal view)
tf
only has max central incisor has only Distinct mesio-facial line angles
Distinct mesio-facial and distofacial line angles
max lat incisors
Termed incisal —- when newly erupted (slightly rounded); after wear it becomes flattened and is termed incisal —-
Termed incisal ridge when newly erupted (slightly rounded); after wear it becomes flattened and is termed incisal edge
tf
incisal view of max central inc
The proximal contacts are in the middle of the middle third of the crown and in line with the incisal ridge
t
max central incisor
cingulum is positioned slightly —- to the bisecting line which yields a slightly —- mesial outline of the lingual surface vs. the distal
cingulum is positioned slightly distal to the bisecting line which yields a slightly longer mesial outline of the lingual surface vs. the distal
incisal view of max central incisor
1) Cingulum
2) Mesial marginal ridge
3) ——-
4) Lingual fossa
1)Cingulum 2) Mesial marginal ridge 3) Distal marginal ridge 4) Lingual fossa
cervical cross section of max central incisors;
Horizontal cross-section at the —- region shows an external —– ——-outline form
and also a —— —— outline form of the pulp
Crown to Root Ratio 1: 1 ½ of max central incisors
1;1.5
max central incisor
Single, —–, relatively straight; may incline —-
—— pulp canal
Single, conical, relatively straight; may incline distally
single pulp canal
“Peg” lateral and Sometimes congenitally missing
Maxillary Lateral Incisor
Sometimes congenitally missing
max lat incisors
Over 60% of the maxillary central incisor specimens showed —- canals
Over 60% of the maxillary central incisor specimens showed accessory canals
tf max lat incisor Exhibits less curvature than central
F Exhibits more curvature than central
tf max lat incisor Mesial outline straighter than the distal outline
t
max lat incisors have — when newly erupted
mammelons
correct the statement
max lat incisor–>
More rounded incisal angles (DI < rounded than MI)
max lat incisor–>
More rounded incisal angles (DI > rounded than MI)
tf max lat inc.–>
Incisal edge may slope gingivally toward mesial aspect
f
Incisal edge may slope gingivally toward distal aspect
tf max lat incisor Shorter and narrower than central incisor
t
max lateral incisor –>Root— with — inclination
Root conical with distal inclination
(narrow mesiodistally broad faciolingually
root of max lat incisor
Crown and root taper to the —- in max lat incisor
Crown and root taper to the lingual
max lat incisor –> less prominent cingulum and marginal ridges than central
F
More prominent cingulum and marginal ridges than central
Deeper lingual fossa which may have developmental grooves or lingual pit
max lat incisor
Most pronounced lingual anatomy of all anteriors
max lat incisor
lat max incisor
Root uniformly —–
Root apex usually inclines —-
Root uniformly convex
Root apex usually inclines distally
lat max incisor
mesial view
Wedge-shaped crown
Incisal ridge broader faciolingually
mesial of max lat incisor
mesial max lat incisor
Incisal edge is over center of tooth
tf mesial view of max lat incisor–>CEJ line is more pronounced than central
CEJ line is less pronounced than central
tf
max lat incisor Cingulum may be slightly more convex than central
t
tf
distal view of max lat incisors–>Facial contour more rounded than central
t
TF
Distal CEJ is less curved than mesial of max lat incisor
T
More ovoid crown outline form
max lat incisors
More convex facially and lingually than central incisor
max lat incisor
Marginal ridges and cingulum more prominent than central incisor
max lat incisor
Cingulum more centered
on max lat incisor
proximal contact in line in the middle of the middle third of the crown and the incisal ridge
max lat and central incisor
Horizontal cross-section at cervical region shows a more —- outline form (pulp also)
Horizontal cross-section at cervical region shows a more ovoid outline form (pulp also); single root
max lat incisor
Wider faciolingually than mesiodistally
max lat incisor
Wider mesiodistally at the labial than the lingual
max lat incisor
developmental groove in the root of teeth that may continue apically down the root.
Radicular grooves (RGs)
Grooves run from the beginning of the ——- and along the root surface to the —-.
Grooves run from the beginning of the cemento-enamel junction (CEJ) and along the root surface to the apex.
the course of the radicular grooves is —-.
the course of the grooves is straight.
most often located on the palatal aspect of maxillary lateral incisors,
Radicular grooves
radicular grooves
and rarely on the labial root surface of the central incisors.
distal position dominating, as it occurs in approximately 70% of cases
radicular grooves
promotes accumulation of difficult-to-remove plaque and calculus
radicular grooves
prognosis of pulp diseases and/or periapical inflammation
in presense of radicular grove
depends in part on the groove’s extension,
the depth of the groove,
and the relation of the groove to the pulp cavity
Biological width
Epithelial attachment (0.97 mm) +
Connective tissue attachment (1.07 mm)
A
Histological sulcus
tf retrognathic profile is more prevalent than prognathic profile
T
22% vs. 6%
distal occlusion
retrognathic profile
mesial occlusion
prognathic profile
horizonta overlap
overjet
vertical overlap
overbite
ant guidanc
Contact of maxillary incisors and mandibular incisors to guide mandible downward to create disarticulation of the posterior teeth
