1. 1. Definition:
1.1. 1a. Incisor : Lower incisal edges occlude anterior to the cingulum plateau of the upper incisors.
1.2. 1b. Canine
1.2.1. Upper canine occlude distal to embrasure between lower canine & first premolar
1.3. 1c. Molar: Mesiobuccal cusp of upper 1st molar occlude posterior to mesiobuccal groove of lower 1st molar.
2. 4. Treatment
2.1. 4a. Factors to consider
2.1.1. Patient
2.1.1.1. 4a1. Pt's Opinion
2.1.1.2. 4a2. Male (_>_) Female
2.1.1.3. 4a3. Growth pattern
2.1.1.4. 4a4. severity of Skeletal Pattern
2.1.2. Malocclusion
2.1.2.1. 4a6. Edge to Edge Bite
2.1.2.2. 4a5. amount of Over bite
2.1.2.3. 4a7. Degree of Compensation
2.2. 4b. Tx timing
2.2.1. 4b1. when & why do early? At mixed dentition to correct pseudoclass III
2.2.2. 4c21a. redirect Growth modification
2.2.3. Interceptive
2.2.4. Definitive
2.2.4.1. 4b2. time = permenant dentition, non growing pt
2.3. 4c. TREATMENT OPTIONS
2.3.1. Interceptive Tx
2.3.1.1. Aims
2.3.1.1.1. 4c1. eliminate anterior displacement before the eruption of canine & premolars so guiding it into Cl I relationship
2.3.1.1.2. 4c2.provide space for for buccal segmentby proclining the the UI
2.3.1.1.3. 4c4. improve psychological
2.3.1.1.4. 4c3. allow normal growth of maxilla
2.3.1.2. Management
2.3.1.2.1. URA
2.3.2. Growth Modifications
2.3.2.1. Aim
2.3.2.1.1. 4c9. to correct Class III skeletal pattern in GROWING patients
2.3.2.2. Management
2.3.2.2.1. 4c10. Functional appliance
2.3.2.2.2. 4c11. Headgear : Reverse pull or Protraction
2.3.2.2.3. 4c12. Chin cup
2.3.3. Ortho Camouflage
2.3.3.1. Aim
2.3.3.1.1. 4c22. mild/ moderate skeletal discrepancy
2.3.3.2. Management
2.3.3.2.1. 4c23. Fixed Appliance
2.4. Orthognathic Surgery
2.4.1. Aim
2.4.1.1. 4c24. Achieve good result in severe cases in non- growing patient
2.4.2. Management
2.4.2.1. Multidisciplinary
2.4.2.1.1. 4c25. Orthognathic surgery done by oral and maxillofacial surgeon.
2.4.2.1.2. 4c26. Orthodontic treatment pre & post surgical done by orthodontist.
3. 5. Retention
3.1. 5a. ALL cases need retention except for corrected anterior crossbite with adequate OB
3.1.1. 5b. not enough ob in cases of anterior crossbite
3.2. Relapse happens if :
3.2.1. 5c. Un__________ growth
4. 2. Aetiology
4.1. 2a. Skeletal
4.1.1. 2a1. Genetic
4.1.2. 2a2. Cranofacial Abnormalities e.g: cleft lip and palate
4.2. 2b. Soft Tissue
4.2.1. 2b1. Reduce severity of Class III by encourage dentoalveolar compensation
4.3. 2c. D....
4.3.1. 2c1. Crowding of upper arch
4.3.2. 2c2. Hypodontia of upper arch
5. 3. Features
5.1. Extraoral
5.1.1. 3a.Skeletal
5.1.1.1. 3a1. Maxilla= Retrognathic
5.1.1.2. 3a2. Mandible= prognathic mandible
5.1.1.3. 3a3. or BoTH___
5.1.2. 3b. Soft Tissue
5.1.2.1. 3b1. Lip?
5.1.3. 3c. Dental
5.1.3.1. 3c1. Upper arch = Crowding
5.1.3.2. 3c2. Lower arch= Spacing
5.1.3.3. 3c3.dentoalveolar compensation: UI proclined, LI retroclined
5.2. Intraoral
5.2.1. Crossbites
5.2.1.1. 3c4. anterior crossbite associated with? a forward functional displacement of the mandible.
5.2.1.2. 3c5. posterior?= buccal crossbite
5.3. Cephalometric
5.3.1. 3d. SNA reduced = </=78
5.3.2. 3e. SNB increased = =/> 81
5.3.3. 3f. ANB < 2 = skeletal III
5.3.4. 3g. UIA increased = >115
5.3.5. 3h. LIA reduced = <87
5.3.6. 3i. vertical (MMA & LMPH)= varies