OPTION 3

Dewey's Modification of Angle's Malocclusion

 

In 1915, Dewey modified the Angle's classification of malocclusion. He has modified class I and Class III Malocclusions into subgroups, i.e., Class I into five types and Class III into three types.

 

 

Dewey's Modification of Angle's Class / Malocclusion

He divided Angle 's class I into five types:

 

1.           Type 1 — Angle's class I malocclusion with crowded or bunched anterior teeth.

2.           Type 2 — Angle's class I malocclusion with proclined maxillary incisors.

3.           Type 3 — Angle's class I malocclusion with anterior cross bite (retroclined upper incisors) when lower incisors are normally placed.

4.           Type 4 — Angle's class I molar relation with posterior teeth in crossbite (buccal/lingual crossbite).

5.           Type 5 — The permanent molar has drifted mesially due to early loss of teeth mesial to them (early loss of deciduous molars/second premolar).

Key concept:

 

According to Dewey's modification:

Type 1: Crowding of maxillary anterior teeth

Type 2:Proclinedmaxillary incisors

Type 3: Maxillary incisors are in crossbite

Type 4: Posterior cross-bite

Type 5: Mesial drift of molars

No modifications

Type 1: Edge to edge bite

Type 2: Crowded mandibular incisors and lingual to maxillary incisors

Type 3: Underdeveloped crowded Maxillary arch and a well developed Mandibular arch

 

According to Dewey's modification:

Type 5: The permanent molar has drifted mesially due to early extraction of second deciduous molar or second premolar