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36 terms

The Permanent Incisors

STUDY
PLAY
Functions of central incisors (3)
mastication( incision), phonetics (th,f, v sounds), and esthetics (support profile of lips and face in addition to they size, shape, color and alignment)
Arch traits of maxillary central incisor (2)
1. widest of the incisor class- viewed labially or lingually
2. maxillary central in larger than lateral
Maxillary central incisor: Developmental data:
1. initiation of calcification
2. completion of enamel
3.eruption
4. completion of root
1. initiation of calcification 3-4 months
2. completion of enamel 4-5 years
3.eruption 7-8 years
4. completion of root 10 yrs.
Characteristics of maxillary central incisor- roots, lobes, pulp horns, cusps
1 root, 4 lobes, 3 pulp horns, 0 cusps
Maxillary central incisor: Orientation in arch:
Faciolingual angulation
Mesiodistal angulation
faciolingual angulation 28 degrees
mesiodistal angulation 2 degrees
General outline/ shape from
1. proximal view
2. facial/lingual view
3. incisal view
1. wedge
2.trapezoidal
3. triangular
cr top dimensions
10.5
root top dimension
13
M-D dimension top
8.5
m-d dimension top
7
L-L dimension top
7
l-l dimension top
6
m dimension top
3.5
d dimension top
2.5
cr dimension bottom
9
root dimension bottom
13
M-D dimension bottom
6.5
m-d dimension bottom
5
L-L dimension bottom
6
l-l dimension bottom
5
m dimension bottom
3
d dimension bottom
2
Maxillary incisor arch traits
fossa
crown
labial surface
fossa deeper
crown wider
labial surface more convex
what is the functional form of the maxillary central incisor
wedge shape
how many mamelons are on the maxillary central incisor
3
how many lobes are on the maxillary central incisor
4
Hutchinson's Incisors
screwdriver shaped
labial profile curvature
hawk bill
when do the maxillary lateral incisors initiate calcification
1 year
when do the lateral maxillary incisors complete enamel development
4-5 years
when do lateral maxillary incisors erupt
8-9 years
when is root development complete for maxillary lateral incisors
11 years
maxillary lateral incisor characteristics
number of roots
number of lobes
pulp horns
number of cusps
1 root
4 lobes
3 pulp horns
0 cusps
what tooth is most often missing congenitally
maxillary lateral incisor
variation rank for maxillary lateral incisor
2nd.... behind 3rd molar
what is unique about the maxillary lateral incisor crown dimension
smallest of any maxillary tooth