Class2 malocclusion /certified fixed orthodontic courses by Indian dental academy

CLASS 2
MALOCCLUSON

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INDIAN DENTAL ACADEMY
Leader in continuing dental education


CLASSIFICATION OF
CLASS II
MALOCCLUSION


PURPOSE OF CLASSIFICATION
• To

localize and quantify any possible skeletal
contribution to class2 malocclusion
•To identify dental displacement associated with the
class2 malocclusion.
•To assign the patient to one of the class2 types


MOYERS CLASSIFICATION
 Six

Horizontal types

 Five

vertical types


HORIZONTAL TYPES
 Type

A
 Type B
 Type C
 Type D
 Type E
 Type F

Normal skeletal ,but class2 dental

Syndromal types of class2

Mild skeletal features


TYPE-A (Dental class2)








Normal skeletal
profile
Mand dentition
placed normally to
its base
Max dentition is
protracted resulting
in class2 molar
relation
Increased over-jet
and over-bite


TYPE-B (Max excess)

Mid-face prominence
Normal mandible


TYPE-C
Retrognathic max and
mandible
Smaller facial
dimension
Dental protrusion
More in females


TYPE-D
Max and mand
retrognatism
Max dental
protrusion


TYPE-E
Max prognathism
and dental
protrusion
Mand dental
protrusion


TYPE-F
It is a large heterogeneous group
with mild skeletal class2
tendencies
It is a milder form of types B,C,D,E.


VERTICAL TYPES
 The

five vertical types are not as clearly
differentiated as the four syndromal
horizontal types


TYPE-1 (Steep mandibular plane or high angle case)
 Mand

plane
and occlusal
plane are
steeper than
normal
 Palate tipped
down
ACB tipped up


TYPE-2 “ Square face”

 MP,PP,OP

and ACB
are more
horizontal


TYPE-3
 PP

tipped
up ant
 Dec ant
face ht
 Open bite


TYPE-4
 PP,MP,OP

all

are tipped
down leaving
lip line high
 Horz B


TYPE-5
 PP

tipped
down ant
 Deep bite


Skeletal

CLASS 2
Dental


A skeletal Class II - fault with the maxilla

A skeletal Class II - fault with the mandible

A skeletal Class II - vertical

DENTAL CLASS-2


Maxillary Dental protrusion



Mesial drift of the maxillary first permanent molars
Congenital disease or loss of the primary teeth
Ectopic molar eruption
Interarch tooth size discrepancy

Affects only lips

Primary dentition
Pre-adolescents
Treatment of class 2
Adolescents

Adults

Pre school children (primary
dentition)

Flush terminal

Distal step

Mesial step

Mandibular deficiency can be recognized by age 3

 Growth

modification can be used to correct
distal step easily
 As growth continues the discrepancy tends to
recur as quickly as it was corrected.( both AP
and Vertical skeletal discrepancy)
 Except in most severe case it is unwise to
begin treatment


Treatment of pre-adolescent
children's


 In

early years of 20th century

Pressure against growing face( head gear )
• Angle introduced class 2 elastics to position
mandible forward
•At later stage in US fixed guide planes were used
to force pts to advance the mandible upon closure
With advent of ceph it became clear that
both elastics and guide planes corrected
class2 by mand dental protrusion

 Head

gear was re-introduced in 1940s

ceph analysis clearly demonstrated not only
retraction of upper teeth but also effects on
max growth
 In

Europe efforts to stimulate mandibular
growth led to the devt of a family of
“functional appliances”.


Thank You
Leader in continuing dental education


Class2 malocclusion /certified fixed orthodontic courses by Indian dental academy

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