Sunday, February 6, 2011

malocclusion in general




Classification Of Malocclusion :

1 ) Dental Variation
2 ) Skeletal Variation

Dental Variation :

1 ) Intra Arch Variation
2 ) Inter Arch Variation

Intra Arch Variation :

1 ) Anomalies in Tooth Position
2 ) Impaction
3 ) Crowding
4 ) Spacing
5 ) Midline Diastema

Inter Arch Variation :

1 ) Incisal Inter Arch Variation
2 ) Posterior Inter Arch Variation

Skeletal Variation :

1 ) Anterio-Posterior Relationship
2 ) Vertical Relationship
3 ) Transverse Relationship

Inter Arch Variation : Incisal Inter Arch Variation

1 ) Anterio-Posterior relationship :

Incisal Relationship :

-Class i
-Class ii division 1
-Class ii division 2
-Class iii

2 ) Vertical Relationship :

A ) Increased Overbite :

-Complete
-Incomplete
-Traumatic

B ) Anterior Open Bite

C ) Reduced Overbite

3 ) Transverse Relationship :

-Center Line Discrepancy

Inter Arch Variation : Posterior Inter Arch Variation

1 ) Anterio-Posterior Relationship :

A ) Angle’s Relationship : 

-Class i
-Class ii
-Class iii

B ) Canine Relationship : 

-Class i
-Class ii
-Class iii

2 ) Vertical Relationship :

-Lateral Open Bite

3 ) Transverse Relationship :

-Buccal Cross Bite
- Lingual Cross Bite

Skeletal Variation :

1 ) Anterio-Posterior Relationship :

A ) Class i skeletal relationship – ANB Angle : ( 2-4 )degree
B ) Class ii skeletal relationship – ANB Angle : > 4 degree
C ) Class iii skeletal relationship – ANB Angle : < 2 degree 

2 ) Vertical Relationship : 

A ) Maxillary Mandibular Plane Angle (MMPA) :

-Average : (27+/-5) degree 
-Open bite : 32 degree 
-Deep Bite : 22 degree

B ) Lower Facial Height ( Subnasale – Menton ) : 

-Average : 55% 
-Increased : > 55%
-Reduced : < 55%

3 ) Transverse Relationship : 

A ) Maxilla :

-Wide Maxilla – Lingual Crossbite
-Narrow Maxilla – Buccal Crossbite

B ) Mandible :

-Wide Mandible – Buccal Crossbite
-Narrow Mandible – Lingual Crossbite

Indication For Orthodontic Treatment :

1 ) Aesthetic
2 ) Function
3 ) Prosthetic
4 ) Prophylactic

Orthodontic Treatment :

1 ) Removable Appliance
2 ) Fixed Appliances
3) Functional Appliances
4 ) Orthognathic Surgery

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