Lab 6 - permanent maxillary incisors

purpose of permanent maxillary incisors

• mastication

• phonetics

• esthetics

• cutting and shoveling food

universal numbers for permanent maxillary central incisors

8 and 9

universal numbers for permanent maxillary lateral incisors

7 and 10

where maxillary CI are located in the mouth

2 adjacent teeth in center of maxillary arch

maxillary CI share ______ contacts with each other

mesial

maxillary CI share ____ contact with laterals

distal

maxillary CI shape from labial or lingual

trapezoidal

maxillary CI is widest

mesiodistally

maxillary CI shape from proximal 

triangular 

maxillary CI initiation of calcification

3-4 months

maxillary CI eruption

7-8 years

maxillary CI completion of root

10 years

maxillary CI shape from labial view

trapezoidal 

maxillary CI convexity is greatest in (from labial view)

cervical third

maxillary CI approaches flatness toward (from labial view)

incisal third

maxillary CI mesial outline (from labial view)

meets the incisal ridge at the right angle

mesioincisal angle on CI is sharp or rounded

sharp

maxillary CI distal outline (from labial view)

distoincisal angle more rounded

maxillary CI incisal margin (from labial view)

may exhibit mamolens , generally straight otherwise

mamolens

rounded protuberances of incisal surface on newly erupted incisor teeth

CEJ of CI

crown is narrower mesiodistally at cervical than incisal

developmental depressions on labial surface of CI

2 straight shallow depressions from incisal ridge towards gingival and fade in middle 1/3

developmental depressions on labial surface of CI location

mesiolabial and distolabial

developmental depressions on labial surface of CI represent

divisions of 3 labial lobes

imbrication lines on labial surface of CI

faint curved lines, parallel to the CEJ (not always present)

Height of contour on labial surface of CI

on cervical third

Shape of CI from lingual view

trapezoid 

lingual fossa

large shallow conavity on lingual surface if CI

what is CI from lingual view bordered by

• mesial marginal ridge

• distal marginal ridge

• incisal ridge

• cingulum

Cingulum on lingual view of CI

bulky convexity in cervical third 

what does cingulum on lingual view of CI correspond with

lingual lobe

cingulum on lingual view of CI may be offset

to distal

what sometimes occurs on the lingual aspect of CI

linguogingival groove which separates cingulum from lingual fossa

what borders the lingual fossa of CI

mesial and distal marginal ridges

height of contour on lingual view of CI

cervical third at greatest convexity for cingulum

describe the labial outline on the mesial view of CI

convex, greatest at gingival third

describe the lingual outline on the mesial view of CI

greatest convexity at cervical third at the prominence of cingulum, concave toward middle and incisal thirds

on the mesial view of CI, the CEJ curves slightly toward

incisal

on the mesial view of CI, the CEJ curves deeper toward

mesial

Is the CEJ on mesial of on the mesial of CI the greatest curvature of any tooth surface in mouth 

yes

incisal outline of CI from mesial view

pointed or slightly rounded, flattens with wear and slopes

distal view of CI resembles

mesial

The CEJ on the distal of CI is

NOT as deep or curved as mesial

where is Incisal ridge from incisal aspect of CI stright  

mesiodistally 

where is the incisal aspect widest

mesiodistally

shape of CI from incisal ascept

triangular

Root of CI

• single root

• conical

• relatively straight

• tapers to rounded apex

• tapers toward lingual

why are CI at risk for truamtic fractures (clinical considerations)

due to position in arch

alvulsion (clinical considerations)

complete displacement of tooth from socketpulp

pulpal pathology (clinical considerations)

disease of pulp usually caused by caries or trauma

diastema (clinical considerations)

space between teeth

lingual pit (clinical considerations)

• pit occasionally present on lingual

• susceptible to caries 

• linguolateral groove extends from pit

• more common in max. lateral incisors******

shovel shaped incisors (clinical considerations)

deep lingual fossa 

supragingival lingual deposits on CI (clinical considerations)

plaque build up on lingual surface

Dens in dente on CI (clinical considerations)

pit may be entrance when enamel and dentin have become invaginated in the pulp cavity, due to developmental deviation from normal

where are maxillary LI located

2nd from midline

LI have _____ contact with CI

mesial

LI are similar to CI except they are

smaller

LI are narrower

mesiodistally

features, curvatures, concavities, and convexities are ___ ____ and ____ than CI

more prominent and distinct

initiation of development of LI

1 year

eruption of LI

8-9 years

completion of root of LI

11 years

mesial outline of LI from labial view

mesioincisal angle is sharp

distal outline of LI from labial view

more rounded than distal of CI, distoincisal angle is more rounded

incisal surface of LI from labial view

may exhibit mamelons, more rounded incisal angles than CI

Cervical margin (CEJ) of LI from labial view

curves slightly toward root, less curved than CI

developmental depression and imbrication lines of LI from labial view

sometimes present

height of contour of LI from labial view

cervical third

mesial outline of LI from lingual view

similar to mesial of CI

distal outline of LI from lingual view

similar to CI, distoincisal angle is much more rounded than mesiodistal angle

incisal of LI from lingual view

may exhibit mamelons, more rounded incisal angles than CI 

cervcial margin of LI from lingual view

CEJ curves toward the apical

mesial and distal marginal ridges and cingulum of LI from lingual view, are more _____ than CI

prominent

Cingulum is ______ in LI from lingual view

centered

lingual fossa in LI is _____ than CI

deeper

lingual pit is ___ ___ on LI than CI

more common (potential site for caries)

linguogingival groove of LI from lingual view

starts are lingual pit and extends distally to cingulum

height of contour of LI from lingual view

at the greatest curvature of cingulum in cervical third

mesial CEJ of LI

deeper than on distal 

distal CEJ of LI

not as deep as mesial

incisal aspect of LI

resembles CI but with more prominent cingulum

in incisal aspect, the LI is more ____ labially and lingually than CI

convex

shape of LI from incisal aspect

rhomboidal

root of LI

• single root

• conical shape

• may curve toward distal

• sharp apex

dilaceration (clinical consideration of LI)

distorted shape bend in crowns and usual root curvatures more common than any other incisor

Talon’s cusp (clinical consideration of LI)

incisal portion of cingulum may exhibit tubercle (accessory cusp)

microdontia (clinical consideration of LI)

smaller in size, most common in LI

linguogingival groove may accumulate ___ and it may ________ (clinical consideration of LI)

deposits and it may extend all the way onto root surface

peg lateral (clinical consideration of LI)

lack of development of mesial or distal portions of crown (can be uni or bilateral, relatively common)

congenitally missing LI (clinical consideration of LI)

tooth does not form

Dens in dente in LI (clinical consideration of LI)

more common in lateral because of lingual pit

maxillary lateral incisor 7 replaces baby tooth

D

maxillary central incisor 8 replaces baby tooth

E

maxillary central incisor 9 replaces baby tooth

F

maxillary lateral incisor 10 replaces baby tooth

G