This document discusses modifications to Angle's classification of malocclusion. It describes Lischer's modification, which introduced terms like "neutrocclusion" and suffixes like "version" to describe tooth positions. It also describes Dewey's modification, which divides Angle's Class I and Class III into subtypes. Class I is divided into five subtypes based on features like crowded anterior teeth or molar buccoversion. Class III is divided into three subtypes describing well-aligned teeth, crowded lower incisors, or crowded upper incisors.

1. MODIFICATIONS OF ANGLE`S
CLASSIFICATION
Guided By-
Dr Alka Benker,
Dr Rahul Muchchadia,
Dr Meghna Rao,
Dr Yagnesh Rajpara,
Dr Vidhi Pandya
Presented By-
Lipi Bhatt
3rd year
Batch-A
Roll no-6
Department of orthodontics &

2. WHAT IS ANGLE`S CLASSIFICATION?
 Angle`s system of classification is based on
the anteroposterior relationship of the teeth
with each other.
 Angle introduced this classification with the
concept of key of occlusion & line of
occlusion.
 Maxillary first permanent molar is considered
to be the key of occlusion & angle stated thet
the position of the maxillary first permanent
molar is relatively constant.

3. THERE ARE TWO MODIFICATION OF
ANGLE`S CLASSIFICATION
1. Lischer`s modification
2. Deway`s modification

4. LISCHER`S MODIFICATION
Lischer introduced the following names to
angle`s classification.
Neutrocclusion-class I
Distocclusion-class II
Mesiocclusion-class III

5. It consist of adding the suffix “ version “ to
the word. these indicates the direction of
deviation from normal position.
Lischer also introduced nomenclature to describe
malpositions of individual teeth.

6.  Mesioversion-mesial to normal position.
 Distoversion-distal to normal position.

7.  Linguoversion-lingual to normal position.
 Labioversion/buccoversion-buccal to normal
position.

8.  Infraversion-away from the line of occlusion.
 Supraversion-crossing the line of occlusion.

9.  Axiversion-wrong axial inclination.
 Torsiversion-rotated on its long axis.

10.  Transversion-transposition-wrong position of
teeth.

11. DEWAY`S MODIFICATION
 Martin Deway divided angle`s class I &
III into further types
 Class I is divided into five types.
 Class III is divided into three types.
 Class II has no types.

12. CLASS I
 Type 1
Crowded maxillary anterior teeth.
canines may be abnormally positioned,
other individual teeth irregularities present.

13.  Type 2
Proclined or labioversion of maxillary incisor.

14.  Type 3
Linguoversion of maxillary incisor.
Anterior crossbite present.

15.  Type 4
Incisors & canines normally positioned.
Molars & premolars are in buccoversion.
Posterior crossbite seen.

16.  Type 5
Mesioversion of molar.
Molar have moved mesially due to premature
loss of teeth anterior to molar.

17. CLASS III
 Type 1
Well aligned teeth & dental archs.
Edge-edge relationship exists.

18.  Type 2
Crowded mandibular incisor.
Normally placed lower incisors behind the
upper incisors.

19.  Type 3
Crowded maxillary incisors.
Underdeveloped maxilla.
Anterior crossbite present.