Angle's Classification of Malocclusion

Q: Angle's classification is based on the relationship of the:

First permanent molars. It uses the maxillary-to-mandibular first permanent molar relationship.

Q: Class II Division 2 is characterised by:

Retroclined upper central incisors. Division 2 shows retroclined upper centrals with deep bite.

Q: In Angle's Class III, the mandibular first molar is:

Mesial to normal. The lower molar is mesial to normal (prognathic tendency).

Q: A limitation of Angle's classification is that it:

Ignores vertical/transverse and skeletal components. It is purely AP and dental, ignoring other planes and skeletal basis.

⭐ High-Yield Facts for Exam

Based on first permanent molar relationship.
Class II div 1 = proclined upper incisors.
Class II div 2 = retroclined upper centrals + deep bite.
Class III = mandibular molar mesial (prognathic).
Purely dental/AP — complemented by cephalometrics.

Angle's system is based on the anteroposterior relationship of the maxillary first permanent molar to the mandibular first permanent molar.

Class I — Mesiobuccal cusp of the maxillary first molar occludes in the buccal groove of the mandibular first molar (normal molar relation); malocclusion is due to crowding/spacing/rotations.
Class II — Mandibular molar is distal to normal (maxillary molar relatively forward). Division 1 = proclined upper incisors (increased overjet). Division 2 = retroclined upper central incisors with deep bite.
Class III — Mandibular molar is mesial to normal (prognathic mandible / anterior crossbite).

Limitations

Purely dental and anteroposterior; ignores vertical/transverse problems and skeletal vs dental distinction — hence cephalometrics complements it.

Exam Tips ⭐

Key landmark = maxillary first molar to mandibular first molar. Class II div 1 = proclined; div 2 = retroclined uppers.

📝 Practice MCQs — Angle's Classification & Malocclusion

Q1. Angle's classification is based on the relationship of the:

A. Canines

B. Incisors

C. First permanent molars

D. Second molars

Show Answer

✅ Answer: C

It uses the maxillary-to-mandibular first permanent molar relationship.

Q2. Class II Division 2 is characterised by:

A. Proclined upper incisors

B. Retroclined upper central incisors

C. Anterior crossbite

D. Normal molars

Show Answer

✅ Answer: B

Division 2 shows retroclined upper centrals with deep bite.

Q3. In Angle's Class III, the mandibular first molar is:

A. Distal to normal

B. Mesial to normal

C. In normal position

D. Rotated

Show Answer

✅ Answer: B

The lower molar is mesial to normal (prognathic tendency).

Q4. A limitation of Angle's classification is that it:

A. Uses canines

B. Ignores vertical/transverse and skeletal components

C. Is too complex

D. Needs radiographs

Show Answer

✅ Answer: B

It is purely AP and dental, ignoring other planes and skeletal basis.

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⭐ High-Yield Facts for Exam