Class 2, division 1 malocclusions

Class II, Division 1
Malocclusions
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-Class II, Div. 1 malocclusions are the most common
-The prominence of upper incisor are cause of concern
to the patient and parents and the risk of incisor
fracture is high.
Occlusal Features:
-Class II incisor relationship with proclination and an
increased overbite.
-The buccal segment is usually class II, cross bite and
scissors bite may occasionally be found.

Skeletal Relationships:
-Skeletal pattern is class II
-Dento-alveolar compensation by proclination of
lower incisors
-Receding chin which gives a poor facial profile
-The lower facial height is generally average of
reduced.
-Some cases there may be rather high maxillary –
mandibular plane angles.

Typical class II div. I cases showing dento-alveolar
compensation

Facial Growth:
Maxillary mandibular plane angle
is low
Horizontal growth pattern
Maxillary mandibular plane angle
is high
Vertical growth patternwww.indiandentalacademy.com

Soft Tissues:
-Profile – convex
-Lips are grossly incompetent
-Chin receding
-Lip trap

Treatment Objectives:
Major objectives of treatment are to relieve crowding
and irregularity of the teeth and to establish a stable
class I incisor relationship.
-A stable reduction in overjet and overbite.
Early mixed dentition stage

A class II div. 1 treated by distal movement of the
upper buccal segments using an ‘en masse’ appliance
with no extractions in the lower arch

Mild class II div. 1 with crowding treated by
extraction of four first premolars and an upper
removable appliance.

Effects of anterior bite plane

A mild class II with no crowding treated by extraction
of second premolars and fixed appliance.

Intrusion of lower incisors

A gummy smile for a good aesthetic result the upper
incisors would have to be intruded as well as being
retracted.

A severe class II div. 1 incisor mal
relationship.

Case -I

Intra-oral Photographs

Mid-treatment Photographs

End of active treatment extra-oral photographs

End of active treatment Intra-oral photographs

Class 2, division 1 malocclusions

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Class 2, division 1 malocclusions